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29 March 2024
 
  » arxiv » 1512.0853

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A Deep Search For Faint Galaxies Associated With Very Low-redshift C IV Absorbers: III. A Galaxy Sample Complete to 0.01 L* and Evidence for Environmental Effects
Joseph N. Burchett ; Todd M. Tripp ; Rongmon Bordoloi ; Jessica K. Werk ; J. Xavier Prochaska ; Jason Tumlinson ; C. N. A. Willmer ; John O'Meara ; Neal Katz ;
Date 2 Dec 2015
AbstractWe employ a blindly selected sample of low-redshift C IV absorption systems identified in spectra from the Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS), combined with galaxy data from the Sloan Digital Sky Survey (SDSS), to study the metal-enriched circumgalactic medium (CGM) with ~100% completeness for galaxy luminosities L > 0.01 L* at z < 0.015. We find that galaxies are typically found at the C IV absorber redshifts within impact parameters rho < 200 kpc, with the nearest galaxy having L < 0.1 L* for 78% of the absorbers. The ubiquity of faint dwarfs in close proximity to the absorbers suggests that these galaxies affect the enrichment and physical conditions of massive-galaxy halos. However, a fraction of our sample (33%) arise well outside the virial radius of any nearby galaxy brighter than 0.01 L*. The detection rate for C IV absorption within the virial radius is mass dependent and is considerably higher for L >~0.1 L* galaxies (7/8) than for less luminous galaxies (1/10). We also find that the occurrence of C IV absorbers depends strongly on the broader environment: 67% (8/12) of galaxies with rho < 150 kpc in regions of low galaxy density (regions with fewer than ten 0.1 L* galaxies within 1 Mpc) have affiliated C IV absorption while none (0/9) of the galaxies in denser regions show C IV within rho < 150 kpc. The reduced detection rate of C IV in denser environments persists for massive group dark matter halos. In contrast, H I is pervasive in the CGM without regard to mass or environment, although some of these Ly-alpha absorbers could arise in unrelated intergalactic gas.
Source arXiv, 1512.0853
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