First Sagittarius A* Event Horizon Telescope Results. VIII. Physical Interpretation of the Polarized Ring


Por: Akiyama K., Alberdi A., Alef W., Algaba J.C., Anantua R., Asada K., Azulay R., Bach U., Baczko A.-K., Ball D., Balokovic M., Bandyopadhyay B., Barrett J., Bauböck M., Benson B.A., Bintley D., Blackburn L., Blundell R., Bouman K.L., Bower G.C., Boyce H., Bremer M., Brinkerink C.D., Brissenden R., Britzen S., Broderick A.E., Broguiere D., Bronzwaer T., Bustamante S., Byun D.-Y., Carlstrom J.E., Ceccobello C., Chael A., Chan C.-K., Chang D.O., Chatterjee K., Chatterjee S., Chen M.-T., Chen Y., Cheng X., Cho I., Christian P., Conroy N.S., Conway J.E., Cordes J.M., Crawford T.M., Crew G.B., Cruz-Osorio A., Cui Y., Dahale R., Davelaar J., De Laurentis M., Deane R., Dempsey J., Desvignes G., Dexter J., Dhruv V., Dihingia I.K., Doeleman S.S., Dougall S., Dzib S.A., Eatough R.P., Emami R., Falcke H., Farah J., Fish V.L., Fomalont E., Ford H.A., Foschi M., Fraga-Encinas R., Freeman W.T., Friberg P., Fromm C.M., Fuentes A., Galison P., Gammie C.F., García R., Gentaz O., Georgiev B., Goddi C., Gold R., Gómez-Ruiz A.I., Gómez J.L., Gu M., Gurwell M., Hada K., Haggard D., Haworth K., Hecht M.H., Hesper R., Heumann D., Ho L.C., Ho P., Honma M., Huang C.-W.L., Huang L., Hughes D.H., Ikeda S., Violette Impellizzeri C.M., Inoue M., Issaoun S., James D.J., Jannuzi B.T., Janssen M., Jeter B., Jiang W., Jiménez-Rosales A., Johnson M.D., Jorstad S., Joshi A.V., Jung T., Karami M., Karuppusamy R., Kawashima T., Keating G.K., Kettenis M., Kim D.-J., Kim J.-Y., Kim J., Kino M., Koay J.Y., Kocherlakota P., Kofuji Y., Koch P.M., Koyama S., Kramer C., Kramer J.A., Kramer M., Krichbaum T.P., Kuo C.-Y., Bella N.L., Lauer T.R., Lee D., Lee S.-S., Leung P.K., Levis A., Li Z., Lico R., Lindahl G., Lindqvist M., Lisakov M., Liu J., Liu K., Liuzzo E., Lo W.-P., Lobanov A.P., Loinard L., Lonsdale C.J., Lowitz A.E., Lu R.-S., MacDonald N.R., Mao J., Marchili N., Markoff S., Marrone D.P., Marscher A.P., Martí-Vidal I., Matsushita S., Matthews L.D., Medeiros L., Menten K.M., Michalik D., Mizuno I., Mizuno Y., Moran J.M., Moriyama K., Moscibrodzka M., Mulaudzi W., Müller C., Müller H., Mus A., Musoke G., Myserlis I., Nadolski A., Nagai H., Nagar N.M., Nakamura M., Narayanan G., Natarajan I., Nathanail A., Fuentes S.N., Neilsen J., Neri R., Ni C., Noutsos A., Nowak M.A., Oh J., Okino H., Olivares H., Ortiz-León G.N., Oyama T., Özel F., Palumbo D.C.M., Paraschos G.F., Park J., Parsons H., Patel N., Pen U.-L., Pesce D.W., Piétu V., Plambeck R., PopStefanija A., Porth O., Pötzl F.M., Prather B., Preciado-López J.A., Psaltis D., Pu H.-Y., Ramakrishnan V., Rao R., Rawlings M.G., Raymond A.W., Rezzolla L., Ricarte A., Ripperda B., Roelofs F., Rogers A., Romero-Canizales C., Ros E., Roshanineshat A., Rottmann H., Roy A.L., Ruiz I., Ruszczyk C., Rygl K.L.J., Sánchez S., Sánchez-Argüelles D., Sánchez-Portal M., Sasada M., Satapathy K., Savolainen T., Schloerb F.P., Schonfeld J., Schuster K.-F., Shao L., Shen Z., Small D., Sohn B.W., SooHoo J., Salas L.D.S., Souccar K., Stanway J.S., Sun H., Tazaki F., Tetarenko A.J., Tiede P., Tilanus R.P.J., Titus M., Torne P., Toscano T., Traianou E., Trent T., Trippe S., Turk M., van Bemmel I., van Langevelde H.J., van Rossum D.R., Vos J., Wagner J., Ward-Thompson D., Wardle J., Washington J.E., Weintroub J., Wharton R., Wielgus M., Wiik K., Witzel G., Wondrak M.F., Wong G.N., Wu Q., Yadlapalli N., Yamaguchi P., Yfantis A., Yoon D., Young A., Young K., Younsi Z., Yu W., Yuan F., Yuan Y.-F., Zensus J.A., Zhang S., Zhao G.-Y., Zhao S.-S., Najafi-Ziyazi M.

Publicada: 1 ene 2024
Resumen:
In a companion paper, we present the first spatially resolved polarized image of Sagittarius A* on event horizon scales, captured using the Event Horizon Telescope, a global very long baseline interferometric array operating at a wavelength of 1.3 mm. Here we interpret this image using both simple analytic models and numerical general relativistic magnetohydrodynamic (GRMHD) simulations. The large spatially resolved linear polarization fraction (24%-28%, peaking at ~40%) is the most stringent constraint on parameter space, disfavoring models that are too Faraday depolarized. Similar to our studies of M87*, polarimetric constraints reinforce a preference for GRMHD models with dynamically important magnetic fields. Although the spiral morphology of the polarization pattern is known to constrain the spin and inclination angle, the time-variable rotation measure (RM) of Sgr A* (equivalent to ˜ 46° ± 12° rotation at 228 GHz) limits its present utility as a constraint. If we attribute the RM to internal Faraday rotation, then the motion of accreting material is inferred to be counterclockwise, contrary to inferences based on historical polarized flares, and no model satisfies all polarimetric and total intensity constraints. On the other hand, if we attribute the mean RM to an external Faraday screen, then the motion of accreting material is inferred to be clockwise, and one model passes all applied total intensity and polarimetric constraints: a model with strong magnetic fields, a spin parameter of 0.94, and an inclination of 150°. We discuss how future 345 GHz and dynamical imaging will mitigate our present uncertainties and provide additional constraints on the black hole and its accretion flow. © 2024 American Astronomical Society. All rights reserved.

Filiaciones:
Akiyama K.:
 Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, 01886, MA, United States

 National Astronomical Observatory of Japan, 2-21-1 Osawa, , Tokyo, Mitaka, 181-8588, Japan

 Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, 02138, MA, United States

Alberdi A.:
 Instituto de Astrofísica de Andaluciá, CSIC, Glorieta de la Astronomiá s/n, Granada, E-18008, Spain

Alef W.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Algaba J.C.:
 Department of Physics, Faculty of Science, Universiti Malaya, Kuala Lumpur, 50603, Malaysia

Anantua R.:
 Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, 02138, MA, United States

 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

 Department of Physics & Astronomy, The University of Texas at San Antonio, One UTSA Circle, San Antonio, 78249, TX, United States

Asada K.:
 Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan

Azulay R.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

 Departament d'Astronomia i Astrofísica, Universitat de Valéncia, C. Dr. Moliner 50, , Valéncia, Burjassot, E-46100, Spain

 Observatori Astronómic, Universitat de Valéncia, C. Catedrático José Beltrán 2, , Valéncia, Paterna, E-46980, Spain

Bach U.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Baczko A.-K.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

 Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, Onsala, SE-43992, Sweden

Ball D.:
 Steward Observatory and Department of Astronomy, University of Arizona, 933 N. Cherry Avenue, Tucson, 85721, AZ, United States

Balokovic M.:
 Yale Center for Astronomy & Astrophysics, Yale University, 52 Hillhouse Avenue, New Haven, 06511, CT, United States

Bandyopadhyay B.:
 Astronomy Department, Universidad de Concepción, Casilla 160-C, Concepción, Chile

Barrett J.:
 Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, 01886, MA, United States

Bauböck M.:
 Department of Physics, University of Illinois, 1110 West Green Street, Urbana, 61801, IL, United States

Benson B.A.:
 Fermi National Accelerator Laboratory, MS209, P.O. Box 500, Batavia, 60510, IL, United States

 Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, 60637, IL, United States

Bintley D.:
 East Asian Observatory, 660 N. A'ohoku Place, Hilo, 96720, HI, United States

 James Clerk Maxwell Telescope (JCMT), 660 N. A'ohoku Place, Hilo, 96720, HI, United States

Blackburn L.:
 Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, 02138, MA, United States

 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

Blundell R.:
 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

Bouman K.L.:
 California Institute of Technology, 1200 East California Boulevard, Pasadena, 91125, CA, United States

Bower G.C.:
 Institute of Astronomy and Astrophysics, Academia Sinica, 645 N. A'ohoku Place, Hilo, 96720, HI, United States

 Department of Physics and Astronomy, University of Hawaii at Manoa, 2505 Correa Road, Honolulu, 96822, HI, United States

Boyce H.:
 Department of Physics, McGill University, 3600 Rue University, Montréal, H3A 2T8, QC, Canada

 Trottier Space Institute at McGill, 3550 Rue University, Montréal, H3A 2A7, QC, Canada

Bremer M.:
 Institut de Radioastronomie Millimétrique (IRAM), 300 rue de la Piscine, Saint Martin d'Hères, F-38406, France

Brinkerink C.D.:
 Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, Nijmegen, 6500 GL, Netherlands

Brissenden R.:
 Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, 02138, MA, United States

 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

Britzen S.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Broderick A.E.:
 Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, N2L 2Y5, ON, Canada

 Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, N2L 3G1, ON, Canada

 Waterloo Centre for Astrophysics, University of Waterloo, Waterloo, N2L 3G1, ON, Canada

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 Institut de Radioastronomie Millimétrique (IRAM), 300 rue de la Piscine, Saint Martin d'Hères, F-38406, France

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 Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, Nijmegen, 6500 GL, Netherlands

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 Department of Astronomy, University of Massachusetts, Amherst, 01003, MA, United States

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 Korea Astronomy and Space Science Institute, Daedeok-daero 776, Yuseong-gu, Daejeon, 34055, South Korea

 University of Science and Technology, Gajeong-ro 217, Yuseong-gu, Daejeon, 34113, South Korea

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 Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, 60637, IL, United States

 Kavli Institute for Cosmological Physics, University of Chicago, 5640 South Ellis Avenue, Chicago, 60637, IL, United States

 Department of Physics, University of Chicago, 5720 South Ellis Avenue, Chicago, 60637, IL, United States

 Enrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, 60637, IL, United States

Ceccobello C.:
 Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, Onsala, SE-43992, Sweden

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 Princeton Gravity Initiative, Princeton University, Jadwin Hall, Princeton, 08544, NJ, United States

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 Steward Observatory and Department of Astronomy, University of Arizona, 933 N. Cherry Avenue, Tucson, 85721, AZ, United States

 Data Science Institute, University of Arizona, 1230 N. Cherry Avenue, Tucson, 85721, AZ, United States

 Program in Applied Mathematics, University of Arizona, 617 N. Santa Rita, Tucson, 85721, AZ, United States

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 Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, 02138, MA, United States

 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

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 Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, 02138, MA, United States

 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

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 Cornell Center for Astrophysics and Planetary Science, Cornell University, Ithaca, 14853, NY, United States

Chen M.-T.:
 Institute of Astronomy and Astrophysics, Academia Sinica, 645 N. A'ohoku Place, Hilo, 96720, HI, United States

Chen Y.:
 Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, 200030, China

 Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing, 100101, China

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 Korea Astronomy and Space Science Institute, Daedeok-daero 776, Yuseong-gu, Daejeon, 34055, South Korea

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 Instituto de Astrofísica de Andaluciá, CSIC, Glorieta de la Astronomiá s/n, Granada, E-18008, Spain

 Korea Astronomy and Space Science Institute, Daedeok-daero 776, Yuseong-gu, Daejeon, 34055, South Korea

 Department of Astronomy, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, South Korea

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 Physics Department, Fairfield University, 1073 North Benson Road, Fairfield, 06824, CT, United States

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 Department of Astronomy, University of Illinois at Urbana-Champaign, 1002 West Green Street, Urbana, 61801, IL, United States

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 Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, Onsala, SE-43992, Sweden

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 Cornell Center for Astrophysics and Planetary Science, Cornell University, Ithaca, 14853, NY, United States

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 Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, 60637, IL, United States

 Kavli Institute for Cosmological Physics, University of Chicago, 5640 South Ellis Avenue, Chicago, 60637, IL, United States

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 Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, 01886, MA, United States

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 Instituto de Astronomía, Universidad Nacional Autónoma de México (UNAM), Apdo Postal 70-264, Ciudad de México, Mexico

 Institut für Theoretische Physik, Goethe-Universitat Frankfurt, Max-von-Laue-Straße 1, Frankfurt am Main, D-60438, Germany

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 Research Center for Astronomical Computing, Zhejiang Laboratory, Hangzhou, 311100, China

 Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shengrong Road 520, Shanghai, 201210, China

Dahale R.:
 Instituto de Astrofísica de Andaluciá, CSIC, Glorieta de la Astronomiá s/n, Granada, E-18008, Spain

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 Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, Nijmegen, 6500 GL, Netherlands

 Department of Astronomy and Columbia Astrophysics Laboratory, Columbia University, 500 W. 120th Street, New York, 10027, NY, United States

 Center for Computational Astrophysics, Flatiron Institute, 162 Fifth Avenue, New York, 10010, NY, United States

De Laurentis M.:
 Institut für Theoretische Physik, Goethe-Universitat Frankfurt, Max-von-Laue-Straße 1, Frankfurt am Main, D-60438, Germany

 Dipartimento di Fisica 'E. Pancini', Universitá di Napoli 'Federico II', Compl. Univ. di Monte S. Angelo, Edificio G, Via Cinthia, Napoli, I-80126, Italy

 INFN, Sez. di Napoli, Compl. Univ. di Monte S. Angelo, Edificio G, Via Cinthia, Napoli, I-80126, Italy

Deane R.:
 Wits Centre for Astrophysics, University of the Witwatersrand, 1 Jan Smuts Avenue, Braamfontein, Johannesburg, 2050, South Africa

 Department of Physics, University of Pretoria, Hatfield, Pretoria, 0028, South Africa

 Centre for Radio Astronomy Techniques and Technologies, Department of Physics and Electronics, Rhodes University, Makhanda, 6140, South Africa

Dempsey J.:
 East Asian Observatory, 660 N. A'ohoku Place, Hilo, 96720, HI, United States

 James Clerk Maxwell Telescope (JCMT), 660 N. A'ohoku Place, Hilo, 96720, HI, United States

 ASTRON, Oude Hoogeveensedijk 4, Dwingeloo, 7991 PD, Netherlands

Desvignes G.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

 LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, 5 place Jules Janssen, Meudon, F-92195, France

Dexter J.:
 Jila and Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, 80309, CO, United States

Dhruv V.:
 Department of Physics, University of Illinois, 1110 West Green Street, Urbana, 61801, IL, United States

Dihingia I.K.:
 Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shengrong Road 520, Shanghai, 201210, China

Doeleman S.S.:
 Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, 02138, MA, United States

 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

Dougall S.:
 Steward Observatory and Department of Astronomy, University of Arizona, 933 N. Cherry Avenue, Tucson, 85721, AZ, United States

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 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

 Institut de Radioastronomie Millimétrique (IRAM), 300 rue de la Piscine, Saint Martin d'Hères, F-38406, France

Eatough R.P.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

 National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100101, China

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 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

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 Las Cumbres Observatory, 6740 Cortona Drive, Goleta, 93117-5575, CA, United States

 Department of Physics, University of California, Santa Barbara, 93106-9530, CA, United States

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 Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, 01886, MA, United States

Fomalont E.:
 National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, 22903, VA, United States

Ford H.A.:
 Steward Observatory and Department of Astronomy, University of Arizona, 933 N. Cherry Avenue, Tucson, 85721, AZ, United States

Foschi M.:
 Instituto de Astrofísica de Andaluciá, CSIC, Glorieta de la Astronomiá s/n, Granada, E-18008, Spain

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 Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, Nijmegen, 6500 GL, Netherlands

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 Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 32-D476, 77 Massachusetts Avenue, Cambridge, 02142, MA, United States

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Friberg P.:
 East Asian Observatory, 660 N. A'ohoku Place, Hilo, 96720, HI, United States

 James Clerk Maxwell Telescope (JCMT), 660 N. A'ohoku Place, Hilo, 96720, HI, United States

Fromm C.M.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

 Institut für Theoretische Physik, Goethe-Universitat Frankfurt, Max-von-Laue-Straße 1, Frankfurt am Main, D-60438, Germany

 Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Emil-Fischer-Str. 31, Würzburg, D-97074, Germany

Fuentes A.:
 Instituto de Astrofísica de Andaluciá, CSIC, Glorieta de la Astronomiá s/n, Granada, E-18008, Spain

Galison P.:
 Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, 02138, MA, United States

 Department of History of Science, Harvard University, Cambridge, 02138, MA, United States

 Department of Physics, Harvard University, Cambridge, 02138, MA, United States

Gammie C.F.:
 Department of Physics, University of Illinois, 1110 West Green Street, Urbana, 61801, IL, United States

 Department of Astronomy, University of Illinois at Urbana-Champaign, 1002 West Green Street, Urbana, 61801, IL, United States

 NCSA, University of Illinois, 1205 W. Clark Street, Urbana, 61801, IL, United States

García R.:
 Institut de Radioastronomie Millimétrique (IRAM), 300 rue de la Piscine, Saint Martin d'Hères, F-38406, France

Gentaz O.:
 Institut de Radioastronomie Millimétrique (IRAM), 300 rue de la Piscine, Saint Martin d'Hères, F-38406, France

Georgiev B.:
 Steward Observatory and Department of Astronomy, University of Arizona, 933 N. Cherry Avenue, Tucson, 85721, AZ, United States

Goddi C.:
 Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, R. do Matão, 1226, São Paulo, SP 05508-090, Brazil

 Dipartimento di Fisica, Universitá degli Studi di Cagliari, SP Monserrato-Sestu km 0.7 (CA), Monserrato, I-09042, Italy

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Gold R.:
 CP3-Origins, University of Southern Denmark, Campusvej 55, Odense M, DK-5230, Denmark

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 Instituto Nacional de Astrofísica, Optica y Electrónica, Apartado Postal 51 y 216, Puebla Pue., 72000, Mexico

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 Instituto de Astrofísica de Andaluciá, CSIC, Glorieta de la Astronomiá s/n, Granada, E-18008, Spain

Gu M.:
 Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, 200030, China

 Key Laboratory for Research in Galaxies and Cosmology, Chinese Academy of Sciences, Shanghai, 200030, China

Gurwell M.:
 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

Hada K.:
 Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-12 Hoshigaoka, Mizusawa, Iwate, Oshu, 023-0861, Japan

 Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, , Tokyo, Mitaka, 181-8588, Japan

Haggard D.:
 Department of Physics, McGill University, 3600 Rue University, Montréal, H3A 2T8, QC, Canada

 Trottier Space Institute at McGill, 3550 Rue University, Montréal, H3A 2A7, QC, Canada

Haworth K.:
 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

Hecht M.H.:
 Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, 01886, MA, United States

Hesper R.:
 NOVA Sub-mm Instrumentation Group, Kapteyn Astronomical Institute, University of Groningen, Landleven 12, Groningen, 9747 AD, Netherlands

Heumann D.:
 Steward Observatory and Department of Astronomy, University of Arizona, 933 N. Cherry Avenue, Tucson, 85721, AZ, United States

Ho L.C.:
 Department of Astronomy, School of Physics, Peking University, Beijing, 100871, China

 Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing, 100871, China

Ho P.:
 Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan

 East Asian Observatory, 660 N. A'ohoku Place, Hilo, 96720, HI, United States

 James Clerk Maxwell Telescope (JCMT), 660 N. A'ohoku Place, Hilo, 96720, HI, United States

Honma M.:
 Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-12 Hoshigaoka, Mizusawa, Iwate, Oshu, 023-0861, Japan

 Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, , Tokyo, Mitaka, 181-8588, Japan

 Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan

Huang C.-W.L.:
 Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan

Huang L.:
 Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, 200030, China

 Key Laboratory for Research in Galaxies and Cosmology, Chinese Academy of Sciences, Shanghai, 200030, China

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 Instituto Nacional de Astrofísica, Optica y Electrónica, Apartado Postal 51 y 216, Puebla Pue., 72000, Mexico

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 National Astronomical Observatory of Japan, 2-21-1 Osawa, , Tokyo, Mitaka, 181-8588, Japan

 The Institute of Statistical Mathematics, 10-3 Midori-cho, Tachikawa, Tokyo, 190-8562, Japan

 Department of Statistical Science, The Graduate University for Advanced Studies (SOKENDAI), 10-3 Midori-cho, Tachikawa, Tokyo, 190-8562, Japan

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 National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, 22903, VA, United States

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 Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan

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 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

James D.J.:
 ASTRAVEO LLC, P.O. Box 1668, Gloucester, 01931, MA, United States

 Applied Materials Inc., 35 Dory Road, Gloucester, 01930, MA, United States

Jannuzi B.T.:
 Steward Observatory and Department of Astronomy, University of Arizona, 933 N. Cherry Avenue, Tucson, 85721, AZ, United States

Janssen M.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

 Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, Nijmegen, 6500 GL, Netherlands

Jeter B.:
 Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan

Jiang W.:
 Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, 200030, China

Jiménez-Rosales A.:
 Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, Nijmegen, 6500 GL, Netherlands

Johnson M.D.:
 Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, 02138, MA, United States

 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

Jorstad S.:
 Institute for Astrophysical Research, Boston University, 725 Commonwealth Avenue, Boston, 02215, MA, United States

Joshi A.V.:
 Department of Physics, University of Illinois, 1110 West Green Street, Urbana, 61801, IL, United States

Jung T.:
 Korea Astronomy and Space Science Institute, Daedeok-daero 776, Yuseong-gu, Daejeon, 34055, South Korea

 University of Science and Technology, Gajeong-ro 217, Yuseong-gu, Daejeon, 34113, South Korea

Karami M.:
 Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, N2L 2Y5, ON, Canada

 Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, N2L 3G1, ON, Canada

Karuppusamy R.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Kawashima T.:
 Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwanoha, , Chiba, Kashiwa, 277-8582, Japan

Keating G.K.:
 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

Kettenis M.:
 Joint Institute for VLBI ERIC (JIVE), Oude Hoogeveensedijk 4, Dwingeloo, 7991 PD, Netherlands

Kim D.-J.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Kim J.-Y.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

 Department of Astronomy and Atmospheric Sciences, Kyungpook National University, Daegu, 702-701, South Korea

Kim J.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

 Department of Astronomy and Atmospheric Sciences, Kyungpook National University, Daegu, 702-701, South Korea

Kino M.:
 National Astronomical Observatory of Japan, 2-21-1 Osawa, , Tokyo, Mitaka, 181-8588, Japan

 Kogakuin University of Technology & Engineering, Academic Support Center, 2665-1 Nakano, Hachioji, Tokyo, 192-0015, Japan

Koay J.Y.:
 Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan

Kocherlakota P.:
 Institut für Theoretische Physik, Goethe-Universitat Frankfurt, Max-von-Laue-Straße 1, Frankfurt am Main, D-60438, Germany

Kofuji Y.:
 Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-12 Hoshigaoka, Mizusawa, Iwate, Oshu, 023-0861, Japan

 Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan

Koch P.M.:
 Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan

Koyama S.:
 Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan

 Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-no-chom, Nishi-ku, Niigata, 950-2181, Japan

Kramer C.:
 Institut de Radioastronomie Millimétrique (IRAM), 300 rue de la Piscine, Saint Martin d'Hères, F-38406, France

Kramer J.A.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Kramer M.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Krichbaum T.P.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Kuo C.-Y.:
 Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan

 Physics Department, National Sun Yat-Sen University, No. 70, Lien-Hai Road, Kaosiung City, 80424, Taiwan

Bella N.L.:
 Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, Nijmegen, 6500 GL, Netherlands

Lauer T.R.:
 National Optical Astronomy Observatory, 950 N. Cherry Avenue, Tucson, 85719, AZ, United States

Lee D.:
 Department of Physics, University of Illinois, 1110 West Green Street, Urbana, 61801, IL, United States

Lee S.-S.:
 Korea Astronomy and Space Science Institute, Daedeok-daero 776, Yuseong-gu, Daejeon, 34055, South Korea

Leung P.K.:
 Department of Physics, The Chinese University of Hong Kong, N.T., Shatin, Hong Kong

Levis A.:
 California Institute of Technology, 1200 East California Boulevard, Pasadena, 91125, CA, United States

Li Z.:
 School of Astronomy and Space Science, Nanjing University, Nanjing, 210023, China

 Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University, Nanjing, 210023, China

Lico R.:
 Instituto de Astrofísica de Andaluciá, CSIC, Glorieta de la Astronomiá s/n, Granada, E-18008, Spain

 INAF, Istituto di Radioastronomia, Via P. Gobetti 101, Bologna, I-40129, Italy

Lindahl G.:
 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

Lindqvist M.:
 Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, Onsala, SE-43992, Sweden

Lisakov M.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Liu J.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Liu K.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Liuzzo E.:
 INAF, Istituto di Radioastronomia & Italian ALMA Regional Centre, Via P. Gobetti 101, Bologna, I-40129, Italy

Lo W.-P.:
 Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan

 Department of Physics, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan

Lobanov A.P.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Loinard L.:
 Instituto de Radioastronomia y Astrofisica, Universidad Nacional Autónoma de Mexico, Morelia, 58089, Mexico

Lonsdale C.J.:
 Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, 01886, MA, United States

Lowitz A.E.:
 Steward Observatory and Department of Astronomy, University of Arizona, 933 N. Cherry Avenue, Tucson, 85721, AZ, United States

Lu R.-S.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

 Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, 200030, China

 Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing, 210008, China

MacDonald N.R.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Mao J.:
 Yunnan Observatories, Chinese Academy of Sciences, Yunnan Province, Kunming, 650011, China

 Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, China

 Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, China

Marchili N.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

 INAF, Istituto di Radioastronomia & Italian ALMA Regional Centre, Via P. Gobetti 101, Bologna, I-40129, Italy

Markoff S.:
 Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, Amsterdam, 1098 XH, Netherlands

 Gravitation and Astroparticle Physics Amsterdam (GRAPPA) Institute, University of Amsterdam, Science Park 904, Amsterdam, 1098 XH, Netherlands

Marrone D.P.:
 Steward Observatory and Department of Astronomy, University of Arizona, 933 N. Cherry Avenue, Tucson, 85721, AZ, United States

Marscher A.P.:
 Institute for Astrophysical Research, Boston University, 725 Commonwealth Avenue, Boston, 02215, MA, United States

Martí-Vidal I.:
 Departament d'Astronomia i Astrofísica, Universitat de Valéncia, C. Dr. Moliner 50, , Valéncia, Burjassot, E-46100, Spain

 Observatori Astronómic, Universitat de Valéncia, C. Catedrático José Beltrán 2, , Valéncia, Paterna, E-46980, Spain

Matsushita S.:
 Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan

Matthews L.D.:
 Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, 01886, MA, United States

Medeiros L.:
 Department of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, 08544, NJ, United States

Menten K.M.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Michalik D.:
 Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, 60637, IL, United States

 Science Support Office, Directorate of Science, European Space Research and Technology Centre (ESA/ESTEC), Keplerlaan 1, Noordwijk, 2201 AZ, Netherlands

Mizuno I.:
 East Asian Observatory, 660 N. A'ohoku Place, Hilo, 96720, HI, United States

 James Clerk Maxwell Telescope (JCMT), 660 N. A'ohoku Place, Hilo, 96720, HI, United States

Mizuno Y.:
 Institut für Theoretische Physik, Goethe-Universitat Frankfurt, Max-von-Laue-Straße 1, Frankfurt am Main, D-60438, Germany

 Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shengrong Road 520, Shanghai, 201210, China

 School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China

Moran J.M.:
 Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, 02138, MA, United States

 Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, 02138, MA, United States

Moriyama K.:
 Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, 01886, MA, United States

 Institut für Theoretische Physik, Goethe-Universitat Frankfurt, Max-von-Laue-Straße 1, Frankfurt am Main, D-60438, Germany

 Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-12 Hoshigaoka, Mizusawa, Iwate, Oshu, 023-0861, Japan

Moscibrodzka M.:
 Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, Nijmegen, 6500 GL, Netherlands

Mulaudzi W.:
 Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, Amsterdam, 1098 XH, Netherlands

Müller C.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

 Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, Nijmegen, 6500 GL, Netherlands

Müller H.:
 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany

Mus A.:
 Departament d'Astronomia i Astrofísica, Universitat de Valéncia, C. Dr. Moliner 50, , Valéncia, Burjassot, E-46100, Spain

 Observatori Astronómic, Universitat de Valéncia, C. Catedrático José Beltrán 2, , Valéncia, Paterna, E-46980, Spain

Musoke G.:
 Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, Nijmegen, 6500 GL, Netherlands

 Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, Amsterdam, 1098 XH, Netherlands

Myserlis I.:
 Institut de Radioastronomie Millimétrique (IRAM), Avenida Divina Pastora 7, Local 20, Granada, E-18012, Spain

Nadolski A.:
 Department of Astronomy, University of Illinois at Urbana-Champaign, 1002 West Green Street, Urbana, 61801, IL, United States

Nagai H.:
 National Astronomical Observatory of Japan, 2-21-1 Osawa, , Tokyo, Mitaka, 181-8588, Japan

 Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, , Tokyo, Mitaka, 181-8588, Japan

Nagar N.M.:
 Astronomy Department, Universidad de Concepción, Casilla 160-C, Concepción, Chile
ISSN: 20418205
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