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Date and Time of the Query: 2019-06-26 T18:03:49 PDT
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For refcode 2016ApJ...832..124B:
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2016ApJ...832..124B A Deep Search for Faint Galaxies Associated with Very Low Redshift C IV Absorbers. III. The Mass- and Environment-dependent Circumgalactic Medium Burchett, Joseph N.; Tripp, Todd M.; Bordoloi, Rongmon; Werk, Jessica K.; Prochaska, J. Xavier; Tumlinson, Jason; Willmer, C. N. A.; O'Meara, John; Katz, Neal Abstract. Using Hubble Space Telescope Cosmic Origins Spectrograph observations of 89 QSO sightlines through the Sloan Digital Sky Survey footprint, we study the relationships between C IV absorption systems and the properties of nearby galaxies, as well as the large-scale environment. To maintain sensitivity to very faint galaxies, we restrict our sample to 0.0015\lt z\lt 0.015, which defines a complete galaxy survey to L>~ 0.01 L* or stellar mass {M}_*_>~ {10}^8^ {M}_sun_. We report two principal findings. First, for galaxies with impact parameter {rho} \lt 1 {r}_{vir_}, C IV detection strongly depends on the luminosity/stellar mass of the nearby galaxy. C IV is preferentially associated with galaxies with {M}_*_\gt {10}^9.5^ {M}_sun_; lower-mass galaxies rarely exhibit significant C IV absorption (covering fraction {f}_C_={9}_-6_^+12^ % for 11 galaxies with {M}_*_\lt {10}^9.5^ {M}_sun_). Second, C IV detection within the {M}_*_\gt {10}^9.5^ {M}_sun_ population depends on environment. Using a fixed-aperture environmental density metric for galaxies with {rho} < 160 kpc at z\lt 0.055, we find that {57}_-13_^+12^ % (8/14) of galaxies in low-density regions (regions with fewer than seven L\gt 0.15 L* galaxies within 1.5 Mpc) have affiliated C IV absorption; however, none (0/7) of the galaxies in denser regions show C IV. Similarly, the C IV detection rate is lower for galaxies residing in groups with dark matter halo masses of {M}_{halo_}\gt {10}^12.5^ {M}_sun_. In contrast to C IV, H I is pervasive in the circumgalactic medium without regard to mass or environment. These results indicate that C IV absorbers with {log} N({{C}} {{IV}})>~ 13.5 {{cm}}^-2^ trace the halos of {M}_*_\gt {10}^9.5^ {M}_sun_ galaxies but also reflect larger-scale environmental conditions. Key words: galaxies: dwarf, galaxies: evolution, galaxies: groups: general, galaxies: halos, intergalactic medium, quasars: absorption lines
Retrieve 24 NED objects in this reference.
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