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The SFR Efficiency of HI Gas in the Outskirts of Star Forming Galaxies

Published online by Cambridge University Press:  21 March 2017

Marc Rafelski
Marc Rafelski*
Affiliation:
NASA Postdoctoral Fellow at Goddard Space Flight Center Code 665, Greenbelt, MD 20771, USAmarc.a.rafelski@nasa.gov
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Abstract

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In order to understand the origin of the decreased star formation rate (SFR) efficiency of neutral atomic hydrogen gas measured in Damped Lyα Systems (DLAs) at z ~ 3, we measure the SFR efficiency of atomic gas at z ~ 1, z ~ 2, and z ~ 3 around star-forming galaxies. We create galaxy stacks in these three redshift bins, and measure the SFR efficiency by combining DLA absorber statistics with the observed rest-frame UV emission in the galaxies’ outskirts. We find that the SFR efficiency of Hi gas is ~ 3% of that predicted by the KS relation. We find no significant evolution in the SFR efficiency with redshift, although simulations and models predict a decreasing SFR efficiency with decreasing metallicity and thus with increasing redshift. We discuss possible explanations for this decreased efficiency without an evolution with redshift.

Keywords

galaxies: high-redshiftgalaxies: evolution(galaxies:) intergalactic medium(galaxies:) quasars: absorption lines
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 360 - 362
Copyright
Copyright © International Astronomical Union 2017 

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