SDSS-IV MaNGA-resolved Star Formation and Molecular Gas Properties of Green Valley Galaxies: A First Look with ALMA and MaNGA
Por:
Lin, Lihwai, Belfiore, Francesco, Pan H.-A., Bothwell, M. S., Hsieh P.-Y., Huang, Shan, Xiao, Ting, Sanchez, Sebastian F., Hsieh B.-C., Masters, Karen, Ramya, S., Lin J.-H., Hsu C.-H., Li, Cheng, Maiolino, Roberto, Bundy, Kevin, Bizyaev, Dmitry, Drory, Niv, Ibarra-Medel, Hector, Lacerna, Ivan, Haines, Tim, Smethurst, Rebecca, Stark, David V., Thomas, Daniel
Publicada:
10 dic 2017
Resumen:
We study the role of cold gas in quenching star formation in the green
valley by analyzing ALMA (CO)-C-12 (1-0) observations of three galaxies
with resolved optical spectroscopy from the MaNGA survey. We present
resolution-matched maps of the star formation rate and molecular gas
mass. These data are used to calculate the star formation efficiency
(SFE) and gas fraction (f(gas)) for these galaxies separately in the
central ``bulge'' regions and outer disks. We find that, for the two
galaxies whose global specific star formation rate (sSFR) deviates most
from the star formation main sequence, the gas fraction in the bulges is
significantly lower than that in their disks, supporting an
``inside-out'' model of galaxy quenching. For the two galaxies where
SFE can be reliably determined in the central regions, the bulges and
disks share similar SFEs. This suggests that a decline in f(gas). is the
main driver of lowered sSFR in bulges compared to disks in green valley
galaxies. Within the disks, there exist common correlations between the
sSFR and SFE and between sSFR and f(gas). on kiloparsec scales-the local
SFE or f(gas). in the disks declines with local sSFR. Our results
support a picture in which the sSFR in bulges is primarily controlled by
f(gas), whereas both SFE and f(gas). play a role in lowering the sSFR in
disks. A larger sample is required to confirm if the trend established
in this work is representative of the green valley as a whole.
Filiaciones:
Lin, Lihwai:
Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan
Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan
Belfiore, Francesco:
Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge, United Kingdom
University of Cambridge, Kavli Institute for Cosmology, Cambridge, United Kingdom
UCO, Lick Observatory, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA, United States
Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England
Univ Cambridge, Kavli Inst Cosmol, Cambridge CB3 0HE, England
Univ Calif Santa Cruz, UCO Lick Observ, 1156 High St, Santa Cruz, CA 95064 USA
Pan H.-A.:
Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan
Bothwell, M. S.:
Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge, United Kingdom
University of Cambridge, Kavli Institute for Cosmology, Cambridge, United Kingdom
Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England
Univ Cambridge, Kavli Inst Cosmol, Cambridge CB3 0HE, England
Hsieh P.-Y.:
Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan
Huang, Shan:
Center for Cosmology and Particle Physics, New York University, New York, NY, United States
NYU, Ctr Cosmol & Particle Phys, New York, NY 10003 USA
Xiao, Ting:
Shanghai Astronomical Observatory, Chinese Academy of Science, 80 Nandan Road, Shanghai, China
Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
Sanchez, Sebastian F.:
Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, A.P. 70-264, Mexico, D.F., Mexico
Univ Nacl Autonoma Mexico, Inst Astron, AP 70-264, Mexico City 04510, DF, Mexico
Hsieh B.-C.:
Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan
Masters, Karen:
Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth, United Kingdom
Univ Portsmouth, Inst Cosmol & Gravitat, Dennis Sciama Bldg, Portsmouth PO1 3FX, Hants, England
Ramya, S.:
Shanghai Astronomical Observatory, Chinese Academy of Science, 80 Nandan Road, Shanghai, China
Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
Lin J.-H.:
Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan
Department of Physics, National Taiwan University, Taipei, Taiwan
Hsu C.-H.:
Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan
Department of Physics, National Taiwan University, Taipei, Taiwan
Li, Cheng:
Tsinghua Center of Astrophysics, Department of Physics, Tsinghua University, Beijing, China
Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China
Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
Maiolino, Roberto:
Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge, United Kingdom
University of Cambridge, Kavli Institute for Cosmology, Cambridge, United Kingdom
Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England
Univ Cambridge, Kavli Inst Cosmol, Cambridge CB3 0HE, England
Bundy, Kevin:
UCO, Lick Observatory, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA, United States
Univ Calif Santa Cruz, UCO Lick Observ, 1156 High St, Santa Cruz, CA 95064 USA
Bizyaev, Dmitry:
Apache Point Observatory, New Mexico State University, P.O. Box 59, Sunspot, NM, United States
Sternberg Astronomical Institute, Moscow State University, Moscow, Russian Federation
Apache Point Observ, POB 59, Sunspot, NM 88349 USA
New Mexico State Univ, POB 59, Sunspot, NM 88349 USA
Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow, Russia
Drory, Niv:
McDonald Observatory, University of Texas at Austin, 1 University Station, Austin, TX, United States
Univ Texas Austin, McDonald Observ, 1 Univ Stn, Austin, TX 78712 USA
Ibarra-Medel, Hector:
Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, A.P. 70-264, Mexico, D.F., Mexico
Univ Nacl Autonoma Mexico, Inst Astron, AP 70-264, Mexico City 04510, DF, Mexico
Lacerna, Ivan:
Instituto Milenio de Astrofísica, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile
Instituto de Astrofisica, Pontificia Universidad Católica de Chile, Av. Vicuna Mackenna 4860, Macul, Santiago, Chile
Astrophysical Research Consortium, Physics/Astronomy Building, 3910 15th Avenue NE, Seattle, WA, United States
Inst Milenio Astrofis, Av Vicuna Mackenna 4860, Santiago, Chile
Pontificia Univ Catolica Chile, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago 7820436, Chile
Astrophys Res Consortium, Phys Astron Bldg,Rm C319,3910 15th Ave NE, Seattle, WA 98195 USA
Haines, Tim:
Department of Astronomy, University of Wisconsin-Madison, 475N. Charter Street, Madison, WI, United States
Univ Wisconsin, Dept Astron, 475N Charter St, Madison, WI 53703 USA
Smethurst, Rebecca:
School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, United Kingdom
Univ Nottingham, Sch Phys & Astron, Univ Pk, Nottingham NG7 2RD, England
Stark, David V.:
Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Institutes for Advanced Study, Chiba, Kashiwa, Japan
Univ Tokyo, Inst Adv Study, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan
Thomas, Daniel:
Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth, United Kingdom
Univ Portsmouth, Inst Cosmol & Gravitat, Dennis Sciama Bldg, Portsmouth PO1 3FX, Hants, England
Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan
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