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Date and Time of the Query: 2019-08-25 T20:38:49 PDT
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For refcode 2017ApJ...837..138F:
Retrieve 34 NED objects in this reference.
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NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2017ApJ...837..138F Probing Large Galaxy Halos at Z ~ 0 with Automated Ly-{alpha}-absorption Matching French, David M.; Wakker, Bart P. Abstract. We present initial results from an ongoing large-scale study of the circumgalactic medium in the nearby Universe ({cz} <=slant 10,000 {km} {{{s}}}^-1^), using archival Cosmic Origins Spectrograph spectra of background quasi-stellar objects. This initial sample contains 33 sightlines chosen for their proximity to large galaxies (D>=slant 25 kpc) and high signal-to-noise ratios (S/N >=slant 10), yielding 48 Ly-{alpha} absorption lines that we have paired with 33 unique galaxies, with 29 cases where multiple absorbers within a single sightline are paired with the same galaxy. We introduce a likelihood parameter to facilitate the matching of galaxies to absorption lines in a reproducible manner. We find the usual anti-correlation between Ly-{alpha} equivalent width (EW) and impact parameter ({rho}) when we normalize by galaxy virial radius (R_vir_). Galaxies associated with a Ly-{alpha} absorber are found to be more highly inclined than galaxies in the survey volume at a > 99 % confidence level (equivalent to ~ 3.6sigma for a normal distribution). In contrast with suggestions in other recent papers of a correlation with azimuth angle for Mg II absorption, we find no such correlation for Ly-{alpha}. Key words: galaxies: evolution, galaxies: halos, intergalactic medium, quasars: absorption lines
Retrieve 34 NED objects in this reference.
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