Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-30
Astron.J.135:922-927,2008
Astronomy and Astrophysics
Astrophysics
6 pages, 2 figures, Includes Revised Galaxy Luminosities
Scientific paper
10.1088/0004-6256/135/3/922
We examine halo gas cross sections and covering fractions, f_c, of intermediate redshift MgII absorption selected galaxies. We computed statistical absorber halo radii, R_x, using current values of dN/dz and Schechter luminosity function parameters, and have compared these values to the distribution of impact parameters and luminosities from a sample of 37 galaxies. For equivalent widths W_r(2796) > 0.3 Ang, we find 43 < R_x < 88 kpc, depending on the lower luminosity cutoff and the slope, beta, of the Holmberg-like luminosity scaling, R \propto L^beta. The observed distribution of impact parameters, D, are such that several absorbing galaxies lie at D > R_x and several non-absorbing galaxies lie at D < R_x. We deduced f_c must be less than unity and obtain a mean of
Churchill Christopher W.
Kacprzak Glenn G.
Murphy Michael T.
Steidel Charles C.
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