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Gas accretion history of galaxies at z ~ 0 - 2: Comparison of the observational data of molecular gas with the mass evolution model of galaxies

Published online by Cambridge University Press:  09 February 2015

Kana Morokuma ,
Junichi Baba ,
Kazuo Sorai  and
Nario Kuno
Kana Morokuma
Affiliation:
Nobeyama Radio Observatory (NRO), NAOJ, email: kana.matsui@nao.ac.jp
Junichi Baba
Affiliation:
Tokyo Institute of Technology
Kazuo Sorai
Affiliation:
Hokkaido University
Nario Kuno
Affiliation:
Nobeyama Radio Observatory (NRO), NAOJ, email: kana.matsui@nao.ac.jp University of Tsukuba
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Abstract

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We found stellar mass-dependent evolution of galactic molecular gas fractions ($f_{\rm mol}=\frac{M_{\rm mol}}{M_\star+M_{\rm mol}}$, Mmol: molecular gas mass, M*: stellar mass) where less massive galaxies have decreased fmol from z = 1 whereas massive galaxies have already had low fmol until z = 1. Comparison of the observed quantities (fmol, optical and near infra-red [NIR] colors, specific star formation rate [sSFR = SFR/M*]) with mass evolution models suggests that less massive galaxies had high fmol at z = 1 thanks to recent gas accretion.

Keywords

galaxies: evolution - galaxies: ISM - ISM: molecules
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S309: Galaxies in 3D across the Universe , July 2014 , pp. 332
Copyright
Copyright © International Astronomical Union 2015 

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