Establishing the Connections Between Galaxies and Mg II Absorbing Gas
Abstract
HIRES/Keck spectra of Mg II (2796) absorption arising in the "halos" of 15 identified 0.4 < z < 0.9 galaxies are presented. Comparison of the galaxy and absorbing gas properties reveal that the spatial distribution of galactic/halo gas does not follow a smooth galactocentric dependence. The kinematics of absorbing gas in z < 1 galaxies are not suggestive of a single systematic velocity field (i.e. rotation or radial flow) and show little dependence on the QSO-galaxy impact parameter. From the full HIRES dataset of 41 systems (0.4 < z < 1.7), strong redshift evolution in the cloud-cloud velocity dispersion is measured. Direct evidence for turbulent or bulk motion in "high velocity" clouds is found by comparing Fe II and Mg II Doppler parameters.
Cite
@article{arxiv.astro-ph/9604127,
title = {Establishing the Connections Between Galaxies and Mg II Absorbing Gas},
author = {Christopher W. Churchill},
journal= {arXiv preprint arXiv:astro-ph/9604127},
year = {2007}
}
Comments
uuencoded: 4 pages, AASTeX file, 2 encapsulated PostScript figures; To appear in IAGUSP Workshop on Young Galaxies and QSO Absorbers, eds. S.M. Viegas, R.Gruenwald, & R. de Carvalho, (PASP Conference Series) Available as a single compressed PostScript file at http://www.ucolick.org/~cwc/qso/abstract.html