Published in "Outskirts of Galaxies", Astrophysics and Space Science Library, Volume 434. ISBN 978-3-319-56569-9. Springer International Publishing AG, 2017, p. 291.
https://arxiv.org/abs/1612.05305

For a PDF version of the article, click here.

OUTSKIRTS OF DISTANT GALAXIES IN ABSORPTION

Hsiao-Wen Chen


Department of Astronomy & Astrophysics, and Kavli Institute for Cosmological Physics, The University of Chicago, Chicago, IL 60637, USA


Abstract: QSO absorption spectroscopy provides a sensitive probe of both the neutral medium and diffuse ionized gas in the distant Universe. It extends 21 cm maps of gaseous structures around low-redshift galaxies both to lower gas column densities and to higher redshifts. Combining galaxy surveys with absorption-line observations of gas around galaxies enables comprehensive studies of baryon cycles in galaxy outskirts over cosmic time. This Chapter presents a review of the empirical understanding of the cosmic neutral gas reservoir from studies of damped Lyα absorbers (DLAs). It describes the constraints on the star formation relation and chemical enrichment history in the outskirts of distant galaxies from DLA studies. A brief discussion of available constraints on the ionized circumgalactic gas from studies of lower column density Lyα absorbers and associated ionic absorption transitions is presented at the end.


Table of Contents

INTRODUCTION

TRACKING THE NEUTRAL GAS RESERVOIR OVER COSMIC TIME

PROBING THE NEUTRAL GAS PHASE IN GALAXY OUTSKIRTS

THE STAR FORMATION RELATION IN THE EARLY UNIVERSE

FROM NEUTRAL ISM TO THE IONIZED CIRCUMGALACTIC MEDIUM

SUMMARY

REFERENCES

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