TL;DR
This paper reviews observational evidence supporting cold-mode gas accretion onto star-forming galaxies, a key process predicted by cosmological simulations that influences galaxy evolution.
Contribution
It compiles and discusses current observational data that support the occurrence of gas accretion in star-forming galaxies across cosmic time.
Findings
Evidence of gas accretion observed in multiple galaxy systems
Gas inflows are detected through various observational techniques
Gas accretion plays a significant role in galaxy star formation
Abstract
Cold-mode gas accretion onto galaxies is a direct prediction of LCDM simulations and provides galaxies with fuel that allows them to continue to form stars over the lifetime of the Universe. Given its dramatic influence on a galaxy's gas reservoir, gas accretion has to be largely responsible for how galaxies form and evolve. Therefore, given the importance of gas accretion, it is necessary to observe and quantify how these gas flows affect galaxy evolution. However, observational data have yet to conclusively show that gas accretion ubiquitously occurs at any epoch. Directly detecting gas accretion is a challenging endeavor and we now have obtained a significant amount of observational evidence to support it. This chapter reviews the current observational evidence of gas accretion onto star-forming galaxies.
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