Mg II Detection in the Lyman Alpha Forest: Metal Rich Cloud or LSB/Dwarf Galaxy?
Christopher W. Churchill, Vincent Le Brun
Abstract
We report the detection of Mg II absorption in two Lyman alpha forest clouds along the line of sight to PKS 0454+039. These clouds, at redshifts z=0.6248 and z=0.9315, respectively, also have strong Fe II absorption. We present results on the z=0.9315 cloud. The upper limit on log N(HI) is 16.5 cm-2. Based upon UV background photoionization models, we infer that the cloud has super-solar metallicity. Photoionization by a late-type stellar population is ruled out.
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