Molecular gas during the post-starburst phase: low gas fractions in green-valley Seyfert post-starburst galaxies
dc.contributor.author | Yesuf, Hassen M. | |
dc.contributor.author | French, K. Decker | |
dc.contributor.author | Faber, S. M. | |
dc.contributor.author | Koo, David C. | |
dc.date.accessioned | 2017-09-13T15:53:53Z | |
dc.date.available | 2017-09-13T15:53:53Z | |
dc.date.issued | 2017-08 | |
dc.identifier.citation | Molecular gas during the post-starburst phase: low gas fractions in green-valley Seyfert post-starburst galaxies 2017, 469 (3):3015 Monthly Notices of the Royal Astronomical Society | en |
dc.identifier.issn | 0035-8711 | |
dc.identifier.issn | 1365-2966 | |
dc.identifier.doi | 10.1093/mnras/stx1046 | |
dc.identifier.uri | http://hdl.handle.net/10150/625482 | |
dc.description.abstract | Post-starbursts (PSBs) are candidate for rapidly transitioning from starbursting to quiescent galaxies. We study the molecular gas evolution of PSBs at z similar to 0.03-0.2. We undertook new CO (2-1) observations of 22 Seyfert PSB candidates using the Arizona Radio Observatory Submillimeter Telescope. This sample complements previous samples of PSBs by including green-valley PSBs with Seyfert-like emission, allowing us to analyse for the first time the molecular gas properties of 116 PSBs with a variety of AGN properties. The distribution of molecular gas to stellar mass fractions in PSBs is significantly different from normal star-forming galaxies in the CO Legacy Database (COLD) GASS survey. The combined samples of PSBs with Seyfert-like emission line ratios have a gas fraction distribution that is even more significantly different and is broader (similar to 0.03-0.3). Most of them have lower gas fractions than normal star-forming galaxies. We find a highly significant correlation between the WISE 12 and 4.6 mu m flux ratios and molecular gas fractions in both PSBs and normal galaxies. We detect molecular gas in 27 per cent of our Seyfert PSBs. Taking into account the upper limits, the mean and the dispersion of the distribution of the gas fraction in our Seyfert PSB sample are much smaller (mu = 0.025, sigma = 0.018) than previous samples of Seyfert PSBs or PSBs in general (mu similar to 0.1-0.2, sigma similar to 0.1-0.2). | |
dc.description.sponsorship | NSF [AST-0808133, AST-1615730, DGE-1143953]; PEO; ARCS Phoenix Chapter; Alfred P. Sloan Foundation; National Science Foundation; US Department of Energy; National Aeronautics and Space Administration; Japanese Monbukagakusho; Max Planck Society; Higher Education Funding Council for England; American Museum of Natural History; Astrophysical Institute Potsdam; University of Basel; University of Cambridge; Case Western Reserve University; University of Chicago; Drexel University; Fermilab; Institute for Advanced Study; Japan Participation Group; Johns Hopkins University; Joint Institute for Nuclear Astrophysics; Kavli Institute for Particle Astrophysics and Cosmology; Korean Scientist Group; Chinese Academy of Sciences (LAMOST); Los Alamos National Laboratory; Max-Planck-Institute for Astronomy (MPIA); Max-Planck-Institute for Astrophysics (MPA); New Mexico State University; Ohio State University; University of Pittsburgh; University of Portsmouth; Princeton University; United States Naval Observatory; University of Washington; Burton Family | en |
dc.language.iso | en | en |
dc.publisher | OXFORD UNIV PRESS | en |
dc.relation.url | https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stx1046 | en |
dc.rights | © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. | en |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | |
dc.subject | ISM: molecules | en |
dc.subject | galaxies: active | en |
dc.subject | galaxies: evolution | en |
dc.subject | galaxies: nuclei galaxies: Seyfert | en |
dc.subject | galaxies: starburst | en |
dc.title | Molecular gas during the post-starburst phase: low gas fractions in green-valley Seyfert post-starburst galaxies | en |
dc.type | Article | en |
dc.contributor.department | Univ Arizona, Steward Observ | en |
dc.identifier.journal | Monthly Notices of the Royal Astronomical Society | en |
dc.description.collectioninformation | This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu. | en |
dc.eprint.version | Final published version | en |
refterms.dateFOA | 2018-08-19T15:26:17Z | |
html.description.abstract | Post-starbursts (PSBs) are candidate for rapidly transitioning from starbursting to quiescent galaxies. We study the molecular gas evolution of PSBs at z similar to 0.03-0.2. We undertook new CO (2-1) observations of 22 Seyfert PSB candidates using the Arizona Radio Observatory Submillimeter Telescope. This sample complements previous samples of PSBs by including green-valley PSBs with Seyfert-like emission, allowing us to analyse for the first time the molecular gas properties of 116 PSBs with a variety of AGN properties. The distribution of molecular gas to stellar mass fractions in PSBs is significantly different from normal star-forming galaxies in the CO Legacy Database (COLD) GASS survey. The combined samples of PSBs with Seyfert-like emission line ratios have a gas fraction distribution that is even more significantly different and is broader (similar to 0.03-0.3). Most of them have lower gas fractions than normal star-forming galaxies. We find a highly significant correlation between the WISE 12 and 4.6 mu m flux ratios and molecular gas fractions in both PSBs and normal galaxies. We detect molecular gas in 27 per cent of our Seyfert PSBs. Taking into account the upper limits, the mean and the dispersion of the distribution of the gas fraction in our Seyfert PSB sample are much smaller (mu = 0.025, sigma = 0.018) than previous samples of Seyfert PSBs or PSBs in general (mu similar to 0.1-0.2, sigma similar to 0.1-0.2). |