Evolution of CIV Absorbers. II. Where does CIV live?
Farhanul Hasan, Christopher W Churchill, Bryson Stemock, Nikole M, Nielsen, Glenn G. Kacprzak, Mark Croom, Michael T Murphy

TL;DR
This study investigates the distribution and origins of CIV-absorbing gas around galaxies across cosmic time, revealing how gas radii relate to galaxy luminosity and evolution, and proposing a model involving dwarf galaxy outflows and recycled gas.
Contribution
It provides a novel analysis of CIV absorber distribution relative to galaxy halos over redshift, highlighting the role of low-mass galaxies and outflows in enriching galaxy environments.
Findings
CIV gas radii are 30-150% of galaxy virial radii, depending on absorber strength.
Gas radius evolution varies with redshift and absorber strength, indicating changing gas distribution.
Outer halo gas likely originates from dwarf galaxy outflows, inner gas from central galaxies.
Abstract
We use the observed cumulative statistics of CIV absorbers and dark matter halos to infer the distribution of CIV-absorbing gas relative to galaxies at redshifts . We compare the cosmic incidence of CIV absorber populations and galaxy halos, finding that massive halos alone cannot account for all the observed ~{\AA} absorbers. However, the of lower mass halos exceeds that of ~{\AA} absorbers. We also estimate the characteristic gas radius of absorbing structures required for the observed CIV , assuming each absorber is associated with a single galaxy halo. The ~{\AA} and ~{\AA} CIV gas radii are () of the virial radius of () galaxies, and the ~{\AA} gas radius is () of the…
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