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R. R. Mellon, C. W. Churchill (Penn State), S. S. Vogt (UCO/Lick, UCSC)
We studied a quasar absorption line system towards the lensed quasar Q0957+561A,B. MgII, MgI, and FeII absorption profiles were observed in both lines sight at redshift 1.3911 with a resolution of 6 km/s using HIRES/Keck. The profiles show a main density peak with 30 km/s offset between the lines-of-sight, whereas the total velocity spread is 250 km/s.
Galaxy models with various gas density distributions were examined using these absorption profiles and the geometry of the two lines-of-sight. The 30 km/s offset in the profiles likely arises from the systematic kinematics of an extended ``disk'' structure. The wide velocity spread of the profiles is likely due to absorption by clouds in the halo or due to a "random" kinematic component to the absorption complex. The absorption profiles and the models are presented with analysis.