Published in "Gas Accretion onto Galaxies", Astrophysics and Space Science Library, Volume 430. ISBN 978-3-319-52511-2. Springer International Publishing AG, 2017, p. 145.
https://arxiv.org/abs/1612.00451

For a PDF version of the article, click here.

GAS ACCRETION IN STAR-FORMING GALAXIES

Glenn G. Kacprzak


Swinburne University of Technology Center for Astrophysics & Supercomputing, Victoria 3122, Australia


Abstract: Cold-mode gas accretion onto galaxies is a direct prediction of ΛCDM 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.


Table of Contents

INTRODUCTION

THE SPATIAL DISTRIBUTION OF THE CIRCUMGALACTIC MEDIUM
Circumgalactic Gas Radial Distribution
Circumgalactic Gas Spatial Distribution

CIRCUMGALACTIC GAS KINEMATICS
Internal or Intrinsic Gas Kinematics
Relative Gas-Galaxy Kinematics

CIRCUMGALACTIC AND GALAXY GAS-PHASE METALLICITIES

PUTTING IT ALL TOGETHER

DIRECT IMAGING OF GAS ACCRETION

SUMMARY

REFERENCES

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