VERITAS and Fermi-LAT Observations of TeV Gamma-Ray Sources Discovered by HAWC in the 2HWC Catalog


Por: Abeysekara, A. U., Archer, A., Benbow, W., Bird, R., Brose, R., Buchovecky, M., Buckley, J. H., Bugaev, V., Chromey, A. J., Connolly, M. P., Cui, W., Daniel, M. K., Falcone, A., Feng, Q., Finley, J. P., Fortson, L., Furniss, A., Huetten, M., Hanna, D., Hervet, O., Holder, J., Hughes, G., Humensky, T. B., Johnson, C. A., Kaaret, P., Kar, P., Kertzman, M., Kieda, D., Krause, M., Krennrich, F., Kumar, S., Lang, M. J., Lin, T. T. Y., McArthur, S., Moriarty, P., Mukherjee, R., O'Brien, S., Ong, R. A., Otte, A. N., Park, N., Petrashyk, A., Pohl, M., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Richards, G. T., Roache, E., Rulten, C., Sadeh, I., Santander, M., Sembroski, G. H., Shahinyan, K., Sushch, I., Tyler, J., Wakely, S. P., Weinstein, A., Wells, R. M., Wilcox, P., Wilhelm, A., Williams, D. A., Williamson, T. J., Zitzer, B., Abdollahi, S., Ajello, M., Baldini, L., Barbiellini, G., Bastieri, D., Bellazzini, R., Berenji, B., Bissaldi, E., Blandford, R. D., Bonino, R., Bottacini, E., Brandt, T. J., Bruel, P., Buehler, R., Cameron, R. A., Caputo, R., Caraveo, P. A., Castro, D., Cavazzuti, E., Charles, E., Chiaro, G., Ciprini, S., Cohen-Tanugi, J., Costantin, D., Cutini, S., D'Ammando, F., de Palma, F., Di Lalla, N., Di Mauro, M., Di Venere, L., Dominguez, A., Favuzzi, C., Fegan, S. J., Franckowiak, A., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giordano, F., Giroletti, M., Green, D., Grenier, I. A., Guillemot, L., Guiriec, S., Hays, E., Hewitt, J. W., Horan, D., Johannesson, G., Kensei, S., Kuss, M., Larsson, S., Latronico, L., Lemoine-Goumard, M., Li, J., Longo, F., Loparco, F., Lovellette, M. N., Lubrano, P., Magill, J. D., Maldera, S., Mazziotta, M. N., McEnery, J. E., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Monzani, M. E., Morselli, A., Moskalenko, I. V., Negro, M., Nuss, E., Ojha, R., Omodei, N., Orienti, M., Orlando, E., Palatiello, M., Paliya, V. S., Paneque, D., Perkins, J. S., Persic, M., Pesce-Rollins, M., Petrosian, V., Piron, F., Porter, T. A., Principe, G., Raino, S., Rando, R., Rani, B., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Reposeur, T., Sgro, C., Siskind, E. J., Spandre, G., Spinelli, P., Suson, D. J., Tajima, H., Thayer, J. B., Thompson, D. J., Torres, D. F., Tosti, G., Troja, E., Valverde, J., Vianello, G., Vogel, M., Wood, K., Yassine, M., Alfaro, R., Alvarez, C., Alvarez, J. D., Arceo, R., Arteaga-Velazquez, J. C., Rojas, D. Avila, Ayala Solares, H. A., Becerril, A., Belmont-Moreno, E., BenZvi, S. Y., Bernal, A., Braun, J., Brisbois, C., Caballero-Mora, K. S., Capistran, T., Carraminana, A., Casanova, S., Castillo, M., Cotti, U., Cotzomi, J., Coutino de Leon, S., De Leon, C., De la Fuente, E., Dichiara, S., Dingus, B. L., DuVernois, M. A., Diaz-Velez, J. C., Engel, K., Enriquez-Rivera, O., Fiorino, D. W., Fleischhack, H., Fraija, N., Garcia-Gonzalez, J. A., Garfias, F., Gonzalez Munoz, A., Gonzalez, M. M., Goodman, J. A., Hampel-Arias, Z., Harding, J. P., Hernandez, S., Hernandez-Almada, A., Hona, B., Hueyotl-Zahuantitla, F., Hui, C. M., Huntemeyer, P., Iriarte, A., Jardin-Blicq, A., Joshi, V., Kaufmann, S., Lara, A., Lauer, R. J., Lee, W. H., Lennarz, D., Leon Vargas, H., Linnemann, J. T., Longinotti, A. L., Luis-Raya, G., Luna-Garcia, R., Lopez-Coto, R., Malone, K., Marinelli, S. S., Martinez, O., Martinez-Castellanos, I., Martinez-Castro, J., Martinez-Huerta, H., Matthews, J. A., Miranda-Romagnoli, P., Moreno, E., Mostafa, M., Nayerhoda, A., Nellen, L., Newbold, M., Nisa, M. U., Noriega-Papaqui, R., Pelayo, R., Pretz, J., Perez-Perez, E. G., Ren, Z., Rho, C. D., Riviere, C., Rosa-Gonzalez, D., Rosenberg, M., Ruiz-Velasco, E., Salazar, H., Greus, F. Salesa, Sandoval, A., Schneider, M., Arroyo, M. Seglar, Sinnis, G., Smith, A. J., Springer, R. W., Surajbali, P., Taboada, I., Tibolla, O., Tollefson, K., Torres, I., Ukwatta, T. N., Villasenor, L., Weisgarber, T., Westerhoff, S., Wisher, I. G., Wood, J., Yapici, T., Yodh, G., Zepeda, A., Zhou, H., VERITAS Collaboration, Fermi-LAT Collaboration, HAWC Collaboration

Publicada: 10 oct 2018
Resumen:
The High Altitude Water Cherenkov (HAWC) collaboration recently published their 2HWC catalog, listing 39 very high energy (VHE; >100 GeV) gamma-ray sources based on 507 days of observation. Among these, 19 sources are not associated with previously known teraelectronvolt (TeV) gamma-ray sources. We have studied 14 of these sources without known counterparts with VERITAS and Fermi-LAT. VERITAS detected weak gamma-ray emission in the 1 TeV-30 TeV band in the region of DA 495, a pulsar wind nebula coinciding with 2HWC J1953+294, confirming the discovery of the source by HAWC. We did not find any counterpart for the selected 14 new HAWC sources from our analysis of Fermi-LAT data for energies higher than 10 GeV. During the search, we detected gigaelectronvolt (GeV) gamma-ray emission coincident with a known TeV pulsar wind nebula, SNR G54.1+0.3 (VER J1930+188), and a 2HWC source, 2HWC J1930+188. The fluxes for isolated, steady sources in the 2HWC catalog are generally in good agreement with those measured by imaging atmospheric Cherenkov telescopes. However, the VERITAS fluxes for SNR G54.1+0.3, DA 495, and TeV J2032+4130 are lower than those measured by HAWC, and several new HAWC sources are not detected by VERITAS. This is likely due to a change in spectral shape, source extension, or the influence of diffuse emission in the source region. © 2018. The American Astronomical Society. All rights reserved.

Filiaciones:
Abeysekara, A. U.:
 Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

Archer, A.:
 Washington Univ, Dept Phys, St Louis, MO 63130 USA

Benbow, W.:
 Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA

Bird, R.:
 Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

Brose, R.:
 Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

 DESY, Platanenallee 6, D-15738 Zeuthen, Germany

Buchovecky, M.:
 Washington Univ, Dept Phys, St Louis, MO 63130 USA

Buckley, J. H.:
 Washington Univ, Dept Phys, St Louis, MO 63130 USA

Bugaev, V.:
 Washington Univ, Dept Phys, St Louis, MO 63130 USA

Chromey, A. J.:
 Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

Connolly, M. P.:
 Natl Univ Ireland Galway, Sch Phys, Univ Rd, Galway, Ireland

Cui, W.:
 Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA

 Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

 Tsinghua Univ, Ctr Astrophys, Beijing 100084, Peoples R China

Daniel, M. K.:
 Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA

Falcone, A.:
 Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA

Feng, Q.:
 McGill Univ, Phys Dept, Montreal, PQ H3A 2T8, Canada

Finley, J. P.:
 Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA

Fortson, L.:
 Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

Furniss, A.:
 Calif State Univ East Bay, Dept Phys, Hayward, CA 94542 USA

Huetten, M.:
 DESY, Platanenallee 6, D-15738 Zeuthen, Germany

Hanna, D.:
 McGill Univ, Phys Dept, Montreal, PQ H3A 2T8, Canada

Hervet, O.:
 Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA

 Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA

Holder, J.:
 Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

 Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA

Hughes, G.:
 Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA

Humensky, T. B.:
 Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA

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 Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA

 Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA

Kaaret, P.:
 Univ Iowa, Dept Phys & Astron, Van Allen Hall, Iowa City, IA 52242 USA

Kar, P.:
 Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

Kertzman, M.:
 Depauw Univ, Dept Phys & Astron, Greencastle, IN 46135 USA

Kieda, D.:
 Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

Krause, M.:
 DESY, Platanenallee 6, D-15738 Zeuthen, Germany

Krennrich, F.:
 Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

Kumar, S.:
 Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

 Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA

Lang, M. J.:
 Natl Univ Ireland Galway, Sch Phys, Univ Rd, Galway, Ireland

Lin, T. T. Y.:
 McGill Univ, Phys Dept, Montreal, PQ H3A 2T8, Canada

McArthur, S.:
 Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA

Moriarty, P.:
 Natl Univ Ireland Galway, Sch Phys, Univ Rd, Galway, Ireland

Mukherjee, R.:
 Columbia Univ, Barnard Coll, Dept Phys & Astron, New York, NY 10027 USA

O'Brien, S.:
 Univ Coll Dublin, Sch Phys, Dublin 4, Ireland

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 Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

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 Georgia Inst Technol, Sch Phys, 837 State St NW, Atlanta, GA 30332 USA

 Georgia Inst Technol, Ctr Relativist Astrophys, 837 State St NW, Atlanta, GA 30332 USA

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 Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

 Univ Wisconsin, Wisconsin IceCube Particle Astrophys Ctr, Madison, WI USA

 Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA

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 Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA

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 Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

 DESY, Platanenallee 6, D-15738 Zeuthen, Germany

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 DESY, Platanenallee 6, D-15738 Zeuthen, Germany

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 Univ Coll Dublin, Sch Phys, Dublin 4, Ireland

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 McGill Univ, Phys Dept, Montreal, PQ H3A 2T8, Canada

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 Cork Inst Technol, Dept Phys Sci, Cork, Ireland

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 Georgia Inst Technol, Sch Phys, 837 State St NW, Atlanta, GA 30332 USA

 Georgia Inst Technol, Ctr Relativist Astrophys, 837 State St NW, Atlanta, GA 30332 USA

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 Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA

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 Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

Sadeh, I.:
 DESY, Platanenallee 6, D-15738 Zeuthen, Germany

Santander, M.:
 Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA

Sembroski, G. H.:
 Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA

Shahinyan, K.:
 Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

Sushch, I.:
 DESY, Platanenallee 6, D-15738 Zeuthen, Germany

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 McGill Univ, Phys Dept, Montreal, PQ H3A 2T8, Canada

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 Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

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 Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

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 Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

Wilcox, P.:
 Univ Iowa, Dept Phys & Astron, Van Allen Hall, Iowa City, IA 52242 USA

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 Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

 DESY, Platanenallee 6, D-15738 Zeuthen, Germany

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 Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA

 Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA

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 Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

 Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA

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 McGill Univ, Phys Dept, Montreal, PQ H3A 2T8, Canada

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 Hiroshima Univ, Dept Phys Sci, Higashihiroshima, Hiroshima 7398526, Japan

Ajello, M.:
 Clemson Univ, Dept Phys & Astron, Kinard Lab Phys, Clemson, SC 29634 USA

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 Univ Pisa, I-56127 Pisa, Italy

 Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

Barbiellini, G.:
 Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

 Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

Bastieri, D.:
 Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

 Univ Padua, Dipartimento Fis & Astron G Galilei, I-35131 Padua, Italy

Bellazzini, R.:
 Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

Berenji, B.:
 Calif State Univ Los Angeles, Dept Phys & Astron, Los Angeles, CA 90032 USA

Bissaldi, E.:
 Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy

 Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

Blandford, R. D.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

Bonino, R.:
 Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

 Univ Turin, Dipartimento Fis, I-10125 Turin, Italy

Bottacini, E.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

 Univ Padua, Dept Phys & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy

Brandt, T. J.:
 NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

Bruel, P.:
 Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France

Buehler, R.:
 DESY, Platanenallee 6, D-15738 Zeuthen, Germany

Cameron, R. A.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

Caputo, R.:
 NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

 CRESST, Greenbelt, MD 20771 USA

Caraveo, P. A.:
 INAF Ist Astrofis Spaziale & Fis Cosm Milano, Via E Bassini 15, I-20133 Milan, Italy

Castro, D.:
 NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

 Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

Cavazzuti, E.:
 Italian Space Agcy, Via Politecn Snc, I-00133 Rome, Italy

Charles, E.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

Chiaro, G.:
 INAF Ist Astrofis Spaziale & Fis Cosm Milano, Via E Bassini 15, I-20133 Milan, Italy

Ciprini, S.:
 Space Sci Data Ctr Agenzia Spaziale Italiana, Via Politecn Snc, I-00133 Rome, Italy

 Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy

Cohen-Tanugi, J.:
 Univ Montpellier, Lab Univers & Particules Montpellier, CNRS IN2P3, F-34095 Montpellier, France

Costantin, D.:
 Univ Padua, Dipartimento Fis & Astron G Galilei, I-35131 Padua, Italy

Cutini, S.:
 Space Sci Data Ctr Agenzia Spaziale Italiana, Via Politecn Snc, I-00133 Rome, Italy

 Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy

D'Ammando, F.:
 INAF Ist Radioastron, I-40129 Bologna, Italy

 Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy

de Palma, F.:
 Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

 Univ Telemat Pegaso, Piazza Trieste & Trento 48, I-80132 Naples, Italy

Di Lalla, N.:
 Univ Pisa, I-56127 Pisa, Italy

 Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

Di Mauro, M.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

Di Venere, L.:
 Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy

 Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

Dominguez, A.:
 Univ Complutense Madrid, Grp Altas Energias, E-28040 Madrid, Spain

Favuzzi, C.:
 Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy

 Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

Fegan, S. J.:
 Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France

Franckowiak, A.:
 DESY, D-15738 Zeuthen, Germany

Fukazawa, Y.:
 Hiroshima Univ, Dept Phys Sci, Higashihiroshima, Hiroshima 7398526, Japan

Funk, S.:
 Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany

Fusco, P.:
 Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy

 Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

Gargano, F.:
 Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

Gasparrini, D.:
 Space Sci Data Ctr Agenzia Spaziale Italiana, Via Politecn Snc, I-00133 Rome, Italy

 Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy

Giglietto, N.:
 Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy

 Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

Giordano, F.:
 Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy

 Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

Giroletti, M.:
 INAF Ist Radioastron, I-40129 Bologna, Italy

Green, D.:
 NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

 Univ Maryland, Dept Astron, College Pk, MD 20742 USA

Grenier, I. A.:
 Univ Paris Diderot, Lab AIM, CEA IRFU, CNRS,Serv Astrophys,CEA Saclay, F-91191 Gif Sur Yvette, France

Guillemot, L.:
 Univ Orleans, CNRS, Lab Phys & Chim Environnem & Espace, F-45071 Orleans 02, France

 CNRS, INSU, Observ Paris, Stn Radioastron Nancay, F-18330 Nancay, France

Guiriec, S.:
 NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

 George Washington Univ, Dept Phys, 725 21st St NW, Washington, DC 20052 USA

Hays, E.:
 NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

Hewitt, J. W.:
 Univ North Florida, Dept Phys, 1 UNF Dr, Jacksonville, FL 32224 USA

Horan, D.:
 Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France

Johannesson, G.:
 Univ Iceland, Sci Inst, IS-107 Reykjavik, Iceland

 KTH Royal Inst Technol, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden

 Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden

Kensei, S.:
 Hiroshima Univ, Dept Phys Sci, Higashihiroshima, Hiroshima 7398526, Japan

Kuss, M.:
 Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

Larsson, S.:
 AlbaNova, KTH Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden

 AlbaNova, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden

Latronico, L.:
 Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

Lemoine-Goumard, M.:
 Univ Bordeaux 1, IN2P3 CNRS, Ctr Etudes Nucl Bordeaux Gradignan, BP120, F-33175 Gradignan, France

Li, J.:
 Inst Space Sci CSICIEEC, Campus UAB,Carrer Magrans S-N, E-08193 Barcelona, Spain

Longo, F.:
 Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

 Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

Loparco, F.:
 Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy

 Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

Lovellette, M. N.:
 Naval Res Lab, Div Space Sci, Washington, DC 20375 USA

Lubrano, P.:
 Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy

Magill, J. D.:
 Univ Maryland, Dept Astron, College Pk, MD 20742 USA

Maldera, S.:
 Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

Mazziotta, M. N.:
 Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

McEnery, J. E.:
 NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

 Univ Maryland, Dept Astron, College Pk, MD 20742 USA

Michelson, P. F.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

Mitthumsiri, W.:
 Mahidol Univ, Dept Phys, Fac Sci, Bangkok 10400, Thailand

Mizuno, T.:
 Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Higashihiroshima, Hiroshima 7398526, Japan

Monzani, M. E.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

Morselli, A.:
 Ist Nazl Fis Nucl, Sez Roma Tor Vergata, I-00133 Rome, Italy

Moskalenko, I. V.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

Negro, M.:
 Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

 Univ Turin, Dipartimento Fis, I-10125 Turin, Italy

Nuss, E.:
 Univ Montpellier, Lab Univers & Particules Montpellier, CNRS IN2P3, F-34095 Montpellier, France

Ojha, R.:
 NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

Omodei, N.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

Orienti, M.:
 INAF Ist Radioastron, I-40129 Bologna, Italy

Orlando, E.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

Palatiello, M.:
 Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

 Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

Paliya, V. S.:
 Clemson Univ, Dept Phys & Astron, Kinard Lab Phys, Clemson, SC 29634 USA

Paneque, D.:
 Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

Perkins, J. S.:
 NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

Persic, M.:
 Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

 Ist Nazl Astrofis, Osservatorio Astron Trieste, I-34143 Trieste, Italy

Pesce-Rollins, M.:
 Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

Petrosian, V.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

Piron, F.:
 Univ Montpellier, Lab Univers & Particules Montpellier, CNRS IN2P3, F-34095 Montpellier, France

Porter, T. A.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

Principe, G.:
 Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany

Raino, S.:
 Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy

 Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

Rando, R.:
 Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

 Univ Padua, Dipartimento Fis & Astron G Galilei, I-35131 Padua, Italy

Rani, B.:
 NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

Razzano, M.:
 Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

Razzaque, S.:
 Univ Johannesburg, Dept Phys, POB 524,Auckland Pk, Auckland 2006, New Zealand

Reimer, A.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

 Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria

 Leopold Franzens Univ Innsbruck, Inst Theoret Phys, A-6020 Innsbruck, Austria

Reimer, O.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

 Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria

 Leopold Franzens Univ Innsbruck, Inst Theoret Phys, A-6020 Innsbruck, Austria

Reposeur, T.:
 Univ Bordeaux 1, IN2P3 CNRS, Ctr Etudes Nucl Bordeaux Gradignan, BP120, F-33175 Gradignan, France

Sgro, C.:
 Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

Siskind, E. J.:
 NYCB Real Time Comp Inc, Lattingtown, NY 11560 USA

Spandre, G.:
 Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

Spinelli, P.:
 Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy

 Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

Suson, D. J.:
 Purdue Univ Northwest, Hammond, IN 46323 USA

Tajima, H.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

 Nagoya Univ, Solar Terr Environm Lab, Nagoya, Aichi 4648601, Japan

Thayer, J. B.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

Thompson, D. J.:
 NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

Torres, D. F.:
 Inst Space Sci CSICIEEC, Campus UAB,Carrer Magrans S-N, E-08193 Barcelona, Spain

 ICREA, E-08010 Barcelona, Spain

Tosti, G.:
 Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy

 Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy

Troja, E.:
 NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

 Univ Maryland, Dept Astron, College Pk, MD 20742 USA

Valverde, J.:
 Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France

Vianello, G.:
 Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

 Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

Vogel, M.:
 Calif State Univ Los Angeles, Dept Phys & Astron, Los Angeles, CA 90032 USA

Wood, K.:
 Praxis Inc, Alexandria, VA 22303 USA

 Naval Res Lab, Washington, DC 20375 USA

Yassine, M.:
 Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

 Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

Alfaro, R.:
 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico

Alvarez, C.:
 Univ Autonoma Chiapas, Tuxtla Gutierrez, Chiapas, Mexico

Alvarez, J. D.:
 Univ Michoacana, Morelia, Michoacan, Mexico

Arceo, R.:
 Univ Autonoma Chiapas, Tuxtla Gutierrez, Chiapas, Mexico

Arteaga-Velazquez, J. C.:
 Univ Michoacana, Morelia, Michoacan, Mexico

Rojas, D. Avila:
 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico

Ayala Solares, H. A.:
 Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

Becerril, A.:
 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico

Belmont-Moreno, E.:
 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico

BenZvi, S. Y.:
 Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

Bernal, A.:
 Univ Nacl Autonoma Mexico, Inst Astron, Mexico City, DF, Mexico

Braun, J.:
 Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA

Brisbois, C.:
 Michigan Technol Univ, Dept Phys, Houghton, MI 49931 USA

Caballero-Mora, K. S.:
 Univ Autonoma Chiapas, Tuxtla Gutierrez, Chiapas, Mexico

Capistran, T.:
 Inst Nacl Astrofis Opt & Electr, Puebla, Mexico

Carraminana, A.:
 Inst Nacl Astrofis Opt & Electr, Puebla, Mexico

Casanova, S.:
 Polish Acad Sci, Inst Nucl Phys, IFJ PAN, PL-31342 Krakow, Poland

 Max Planck Inst Nucl Phys, Heidelberg, Germany

Castillo, M.:
 Univ Michoacana, Morelia, Michoacan, Mexico

Cotti, U.:
 Univ Michoacana, Morelia, Michoacan, Mexico

Cotzomi, J.:
 Benemerita Univ Autonoma Puebla, Fac Ciencias Fis Matemat, Puebla, Mexico

Coutino de Leon, S.:
 Inst Nacl Astrofis Opt & Electr, Puebla, Mexico

De Leon, C.:
 Benemerita Univ Autonoma Puebla, Fac Ciencias Fis Matemat, Puebla, Mexico

De la Fuente, E.:
 Univ Guadalajara, Dept Fis CUCEI, Guadalajara, Mexico

 Univ Guadalajara, Ciencias Nat & Exactas CUVALLES, Guadalajara, Mexico

Dichiara, S.:
 Univ Nacl Autonoma Mexico, Inst Astron, Mexico City, DF, Mexico

Dingus, B. L.:
 Los Alamos Natl Lab, Div Phys, Los Alamos, NM USA

DuVernois, M. A.:
 Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA

Diaz-Velez, J. C.:
 Univ Guadalajara, Dept Fis CUCEI, Guadalajara, Mexico

 Univ Guadalajara, Ciencias Nat & Exactas CUVALLES, Guadalajara, Mexico

Engel, K.:
 Univ Maryland, Dept Phys, College Pk, MD 20742 USA

Enriquez-Rivera, O.:
 Univ Nacl Autonoma Mexico, Inst Geofis, Mexico City, DF, Mexico

Fiorino, D. W.:
 Univ Maryland, Dept Phys, College Pk, MD 20742 USA

Fleischhack, H.:
 Michigan Technol Univ, Dept Phys, Houghton, MI 49931 USA

Fraija, N.:
 Univ Nacl Autonoma Mexico, Inst Astron, Mexico City, DF, Mexico

Garcia-Gonzalez, J. A.:
 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico

Garfias, F.:
 Univ Nacl Autonoma Mexico, Inst Astron, Mexico City, DF, Mexico

Gonzalez Munoz, A.:
 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico

Gonzalez, M. M.:
 Univ Nacl Autonoma Mexico, Inst Astron, Mexico City, DF, Mexico

Goodman, J. A.:
 Univ Maryland, Dept Phys, College Pk, MD 20742 USA

Hampel-Arias, Z.:
 Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA

Harding, J. P.:
 Los Alamos Natl Lab, Div Phys, Los Alamos, NM USA

Hernandez-Almada, A.:
 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico

Hona, B.:
 Michigan Technol Univ, Dept Phys, Houghton, MI 49931 USA

Hueyotl-Zahuantitla, F.:
 Univ Autonoma Chiapas, Tuxtla Gutierrez, Chiapas, Mexico

Hui, C. M.:
 NASA, Marshall Space Flight Ctr, Astrophys Off, Huntsville, AL USA

Huntemeyer, P.:
 Michigan Technol Univ, Dept Phys, Houghton, MI 49931 USA

Iriarte, A.:
 Univ Nacl Autonoma Mexico, Inst Astron, Mexico City, DF, Mexico

Jardin-Blicq, A.:
 Max Planck Inst Nucl Phys, Heidelberg, Germany

Joshi, V.:
 Max Planck Inst Nucl Phys, Heidelberg, Germany

Kaufmann, S.:
 Univ Autonoma Chiapas, Tuxtla Gutierrez, Chiapas, Mexico

Lara, A.:
 Univ Nacl Autonoma Mexico, Inst Geofis, Mexico City, DF, Mexico

Lauer, R. J.:
 Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA

Lee, W. H.:
 Univ Nacl Autonoma Mexico, Inst Astron, Mexico City, DF, Mexico

Lennarz, D.:
 Georgia Inst Technol, Sch Phys, 837 State St NW, Atlanta, GA 30332 USA

 Georgia Inst Technol, Ctr Relativist Astrophys, 837 State St NW, Atlanta, GA 30332 USA

Leon Vargas, H.:
 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico

Linnemann, J. T.:
 Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

Longinotti, A. L.:
 Inst Nacl Astrofis Opt & Electr, Puebla, Mexico

Luis-Raya, G.:
 Univ Politecn Pachuca, Pachuca, Hidalgo, Mexico

Luna-Garcia, R.:
 Inst Politecn Nacl, Ctr Invest Computac, Mexico City, DF, Mexico

Lopez-Coto, R.:
 Max Planck Inst Nucl Phys, Heidelberg, Germany

Malone, K.:
 Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

Marinelli, S. S.:
 Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

Martinez, O.:
 Benemerita Univ Autonoma Puebla, Fac Ciencias Fis Matemat, Puebla, Mexico

Martinez-Castellanos, I.:
 Univ Maryland, Dept Phys, College Pk, MD 20742 USA

Martinez-Castro, J.:
 Inst Politecn Nacl, Ctr Invest Computac, Mexico City, DF, Mexico

Martinez-Huerta, H.:
 IPN, Ctr Invest & Estud Avanzados, Phys Dept, Mexico City, DF, Mexico

Matthews, J. A.:
 Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA

Miranda-Romagnoli, P.:
 Univ Autonoma Estado Hidalgo, Pachuca, Mexico

Moreno, E.:
 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico

 Benemerita Univ Autonoma Puebla, Fac Ciencias Fis Matemat, Puebla, Mexico

Mostafa, M.:
 Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

Nayerhoda, A.:
 Polish Acad Sci, Inst Nucl Phys, IFJ PAN, PL-31342 Krakow, Poland

Nellen, L.:
 Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City, DF, Mexico

Newbold, M.:
 Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

Nisa, M. U.:
 Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

Noriega-Papaqui, R.:
 Univ Autonoma Estado Hidalgo, Pachuca, Mexico

Pelayo, R.:
 Inst Politecn Nacl, Ctr Invest Computac, Mexico City, DF, Mexico

Pretz, J.:
 Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

Perez-Perez, E. G.:
 Univ Politecn Pachuca, Pachuca, Hidalgo, Mexico

Ren, Z.:
 Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA

Rho, C. D.:
 Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

Riviere, C.:
 Univ Maryland, Dept Phys, College Pk, MD 20742 USA

Rosa-Gonzalez, D.:
 Inst Nacl Astrofis Opt & Electr, Puebla, Mexico

Rosenberg, M.:
 Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

Ruiz-Velasco, E.:
 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico

Salazar, H.:
 Benemerita Univ Autonoma Puebla, Fac Ciencias Fis Matemat, Puebla, Mexico

Greus, F. Salesa:
 Polish Acad Sci, Inst Nucl Phys, IFJ PAN, PL-31342 Krakow, Poland

Sandoval, A.:
 Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico

Schneider, M.:
 Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA

Arroyo, M. Seglar:
 Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

Sinnis, G.:
 Los Alamos Natl Lab, Div Phys, Los Alamos, NM USA

Smith, A. J.:
 Univ Maryland, Dept Phys, College Pk, MD 20742 USA

Springer, R. W.:
 Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

Surajbali, P.:
 Max Planck Inst Nucl Phys, Heidelberg, Germany

Taboada, I.:
 Georgia Inst Technol, Sch Phys, 837 State St NW, Atlanta, GA 30332 USA

 Georgia Inst Technol, Ctr Relativist Astrophys, 837 State St NW, Atlanta, GA 30332 USA

Tibolla, O.:
 Univ Autonoma Chiapas, Tuxtla Gutierrez, Chiapas, Mexico

Tollefson, K.:
 Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

Torres, I.:
 Inst Nacl Astrofis Opt & Electr, Puebla, Mexico

Ukwatta, T. N.:
 Los Alamos Natl Lab, Div Phys, Los Alamos, NM USA

Villasenor, L.:
 Benemerita Univ Autonoma Puebla, Fac Ciencias Fis Matemat, Puebla, Mexico

Weisgarber, T.:
 Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA

Westerhoff, S.:
 Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA

Wisher, I. G.:
 Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA

Wood, J.:
 Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA

Yapici, T.:
 Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

Yodh, G.:
 Univ Calif Irvine, Dept Phys & Astron, Irvine, CA USA

Zepeda, A.:
 Univ Autonoma Chiapas, Tuxtla Gutierrez, Chiapas, Mexico

 IPN, Ctr Invest & Estud Avanzados, Phys Dept, Mexico City, DF, Mexico

Zhou, H.:
 Los Alamos Natl Lab, Div Phys, Los Alamos, NM USA
ISSN: 0004637X
Editorial
UNIV CHICAGO PRESS, 1427 E 60TH ST, CHICAGO, IL 60637-2954 USA, Estados Unidos America
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Volumen: 866 Número: 1
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