SIMBAD references

2017ApJ...837..138F - Astrophys. J., 837, 138-138 (2017/March-2)

Probing large galaxy halos at z ∼ 0 with automated Lyα-absorption matching.


Abstract (from CDS):

We present initial results from an ongoing large-scale study of the circumgalactic medium in the nearby Universe (cz  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 25 kpc) and high signal-to-noise ratios (S/N 10), yielding 48 Lyα 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 Lyα equivalent width (EW) and impact parameter (ρ) when we normalize by galaxy virial radius (Rvir). Galaxies associated with a Lyα absorber are found to be more highly inclined than galaxies in the survey volume at a  99 % confidence level (equivalent to ∼3.6σfor 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 Lyα.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: evolution - galaxies: halos - intergalactic medium - quasars: absorption lines - quasars: absorption lines

Simbad objects: 68

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