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Automated mining of the ALMA archive in the COSMOS field (A3 COSMOS): Cold molecular gas evolution

Published online by Cambridge University Press:  04 June 2020

Liu Daizhong Open the ORCID record for Liu Daizhong [Opens in a new window]  and
A3 COSMOS Team
Liu Daizhong
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany email: dzliu@mpia.de
A3 COSMOS Team
Affiliation:
https://sites.google.com/view/a3cosmos/team
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Abstract

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We present new constraints on the cosmic cold molecular gas evolution out to redshift 6 based on systematic mining of the public ALMA archive in the COSMOS field (A3 COSMOS). Our A3 COSMOS dataset contains ∼ 700 galaxies (0.3 ≲ z ≲ 6) with high-confidence ALMA detection and multi-wavelength SEDs. Combining with ∼ 1,200 CO-observed galaxies at 0 ≲ z ≲ 4 (75% at z < 0.1) in the literature, we parameterize galaxies’ molecular gas depletion time and gas fraction each as a function of stellar mass, offset from the star-forming main-sequence and cosmic age. We propose a new functional form which provides a better fit and implies a “downsizing” effect and “mass-quenching”. By adopting galaxy stellar mass functions and applying our gas fraction function, we obtain a cosmic cold molecular gas density evolution in agreement with recent CO blind field surveys as well as semi-analytic modeling. These together provide us a coherent picture of galaxy cold molecular gas, SFR and stellar mass evolution.

Keywords

galaxies: evolutiongalaxies: high-redshiftgalaxies: ISMsubmillimeter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S352: Uncovering Early Galaxy Evolution in the ALMA and JWST Era , June 2019 , pp. 228 - 233
Copyright
© International Astronomical Union 2020

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