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SDSS-IV MaNGA-resolved star formation and molecular gas properties of green valley galaxies: a first look with ALMA and MaNGA

Lin, Lihwai; Belfiore, Francesco; Pan, Hsi-An; Bothwell, M. S.; Hsieh, Pei-Ying; Huang, Shan; Xiao, Ting; Sánchez, Sebastián F.; Hsieh, Bau-Ching; Masters, Karen; Ramya, S.; Lin, Jing-Hua; Hsu, Chin-Hao; Maiolino, Roberto; Li, Cheng; Bundy, Kevin; Bizyaev, Dmitry; Drory, Niv; Ibarra-Medel, Héctor; Lacerna, Ivan; Haines, Tim; Smethurst, Rebecca; Stark, David V.; Thomas, Daniel

Authors

Lihwai Lin

Francesco Belfiore

Hsi-An Pan

M. S. Bothwell

Pei-Ying Hsieh

Shan Huang

Ting Xiao

Sebastián F. Sánchez

Bau-Ching Hsieh

Karen Masters

S. Ramya

Jing-Hua Lin

Chin-Hao Hsu

Roberto Maiolino

Cheng Li

Kevin Bundy

Dmitry Bizyaev

Niv Drory

Héctor Ibarra-Medel

Ivan Lacerna

Tim Haines

Rebecca Smethurst

David V. Stark

Daniel Thomas



Abstract

We study the role of cold gas in quenching star formation in the green valley by analyzing ALMA 12CO (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 ( fgas) 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 fgas 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 fgas on kiloparsec scales—the local SFE or fgas in the disks declines with local sSFR. Our results support a picture in which the sSFR in bulges is primarily controlled by fgas, whereas both SFE and fgas 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.

Journal Article Type Article
Publication Date Dec 10, 2017
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 851
Issue 1
Pages 1-9
APA6 Citation Lin, L., Belfiore, F., Pan, H., Bothwell, M. S., Hsieh, P., Huang, S., …Thomas, D. (2017). SDSS-IV MaNGA-resolved star formation and molecular gas properties of green valley galaxies: a first look with ALMA and MaNGA. Astrophysical Journal, 851(1), 1-9. https://doi.org/10.3847/1538-4357/aa96ae
DOI https://doi.org/10.3847/1538-4357/aa96ae
Publisher URL http://iopscience.iop.org/article/10.3847/1538-4357/aa96ae
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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