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
We 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.
Beschreibung
[1512.00853] 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
%0 Generic
%1 burchett2015search
%A Burchett, Joseph N.
%A Tripp, Todd M.
%A Bordoloi, Rongmon
%A Werk, Jessica K.
%A Prochaska, J. Xavier
%A Tumlinson, Jason
%A Willmer, C. N. A.
%A O'Meara, John
%A Katz, Neal
%D 2015
%K CIV associations faint galaxies
%T 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
%U http://arxiv.org/abs/1512.00853
%X We 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.
@misc{burchett2015search,
abstract = {We 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.},
added-at = {2015-12-04T10:40:49.000+0100},
author = {Burchett, Joseph N. and Tripp, Todd M. and Bordoloi, Rongmon and Werk, Jessica K. and Prochaska, J. Xavier and Tumlinson, Jason and Willmer, C. N. A. and O'Meara, John and Katz, Neal},
biburl = {https://www.bibsonomy.org/bibtex/2685d9b4b475156f486f4677ec0721e67/miki},
description = {[1512.00853] 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},
interhash = {80ffbf0ac687c226a97a40b40a9e67ab},
intrahash = {685d9b4b475156f486f4677ec0721e67},
keywords = {CIV associations faint galaxies},
note = {cite arxiv:1512.00853Comment: 19 pages, 16 figures. Submitted to ApJ, comments welcome!},
timestamp = {2015-12-04T10:40:49.000+0100},
title = {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},
url = {http://arxiv.org/abs/1512.00853},
year = 2015
}