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• W2070387945 abstract "We examine halo gas cross sections and covering fractions, fc, of intermediate-redshift Mg ii absorption selected galaxies. We computed statistical absorber halo radii, Rx, 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 Wr(2796) ⩾ 0.3 Å, we find 43 ⩽ Rx ⩽ 88 kpc, depending on the lower luminosity cutoff and the slope, β, of the Holmberg-like luminosity scaling, R ∝ Lβ. The observed distribution of impact parameters, D, are such that several absorbing galaxies lie at D>Rx and several non-absorbing galaxies lie at D < Rx. We deduced that fc must be less than unity and obtain a mean of <fc> ∼ 0.5 for our sample. Moreover, the data suggest that halo radii of Mg ii absorbing galaxies do not follow a luminosity scaling with β in the range of 0.2–0.28, if fc = 1 as previously reported. However, provided fc ∼ 0.5, we find that halo radii can remain consistent with a Holmberg-like luminosity relation with β ≃ 0.2 and kpc. No luminosity scaling (β = 0) is also consistent with the observed distribution of impact parameters if fc ⩽ 0.37. The data support a scenario in which gaseous halos are patchy and likely have non-symmetric geometric distributions about the galaxies. We suggest that halo gas distributions may not be governed primarily by galaxy mass/luminosity but also by stochastic processes local to the galaxy." @default.
• W2070387945 created "2016-06-24" @default.
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• W2070387945 date "2008-02-05" @default.
• W2070387945 modified "2023-10-13" @default.
• W2070387945 title "HALO GAS CROSS SECTIONS AND COVERING FRACTIONS OF Mg II ABSORPTION SELECTED GALAXIES" @default.
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• W2070387945 doi "https://doi.org/10.1088/0004-6256/135/3/922" @default.
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