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Title:
xGASS: total cold gas scaling relations and molecular-to-atomic gas ratios of galaxies in the local Universe
Authors:
Catinella, Barbara; Saintonge, Amélie; Janowiecki, Steven; Cortese, Luca; Davé, Romeel; Lemonias, Jenna J.; Cooper, Andrew P.; Schiminovich, David; Hummels, Cameron B.; Fabello, Silvia; Geréb, Katinka; Kilborn, Virginia; Wang, Jing
Affiliation:
AA(International Centre for Radio Astronomy Research, M468, The University of Western Australia, Crawley, WA 6009, Australia), AB(Department of Physics & Astronomy, University College London, Gower Place, London WC1E 6BT, UK), AC(International Centre for Radio Astronomy Research, M468, The University of Western Australia, Crawley, WA 6009, Australia 0000-0001-9165-8905), AD(International Centre for Radio Astronomy Research, M468, The University of Western Australia, Crawley, WA 6009, Australia 0000-0002-7422-9823), AE(Department of Physics & Astronomy, University of the Western Cape, Bellville, Cape Town 7535, South Africa), AF(Department of Astronomy, Columbia University, New York, NY 10027, USA), AG(Department of Physics, Institute for Computational Cosmology, University of Durham, South Road, Durham DH1 3LE, UK), AH(Department of Astronomy, Columbia University, New York, NY 10027, USA), AI(TAPIR, California Institute of Technology, Pasadena, CA 91125, USA), AJ(Autoliv Electronics Germany, Theodor-Heuss-Str 2, D-85221 Dachau, Germany), AK(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, VIC 3122, Australia), AL(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, VIC 3122, Australia), AM(Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 476, Issue 1, p.875-895 (MNRAS Homepage)
Publication Date:
05/2018
Origin:
OUP
Astronomy Keywords:
galaxies: evolution, galaxies: fundamental parameters, galaxies: ISM, radio lines: galaxies
Abstract Copyright:
2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/sty089
Bibliographic Code:
2018MNRAS.476..875C

Abstract

We present the extended GALEX Arecibo SDSS Survey (xGASS), a gas fraction-limited census of the atomic hydrogen (H I) gas content of 1179 galaxies selected only by stellar mass (M* = 109-1011.5 M&sun;) and redshift (0.01 < z < 0.05). This includes new Arecibo observations of 208 galaxies, for which we release catalogues and H I spectra. In addition to extending the GASS H I scaling relations by one decade in stellar mass, we quantify total (atomic+molecular) cold gas fractions and molecular-to-atomic gas mass ratios, Rmol, for the subset of 477 galaxies observed with the IRAM 30 m telescope. We find that atomic gas fractions keep increasing with decreasing stellar mass, with no sign of a plateau down to log M*/M&sun; = 9. Total gas reservoirs remain H I-dominated across our full stellar mass range, hence total gas fraction scaling relations closely resemble atomic ones, but with a scatter that strongly correlates with Rmol, especially at fixed specific star formation rate. On average, Rmol weakly increases with stellar mass and stellar surface density mu*, but individual values vary by almost two orders of magnitude at fixed M* or mu*. We show that, for galaxies on the star-forming sequence, variations of Rmol are mostly driven by changes of the H I reservoirs, with a clear dependence on mu*. Establishing if galaxy mass or structure plays the most important role in regulating the cold gas content of galaxies requires an accurate separation of bulge and disc components for the study of gas scaling relations.
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