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Q 1254+044
V = 16.0; z = 1.018; exp = 2400 s; coverage = 3765.8-6189.9 A
Two Mg II systems at z = 0.5193 and 0.9341 were reported by SS92.
z=0.519389 |DATA & VOIGT PROFILES| |EWs & AOD COLUMNS| |VP PARAMETERS|
The spectrum in the range of the Mg II doublet is somewhat confused by unidentified weak absorption lines. Only absorption features that were common in velocity to both the 2796 and 2803 transitions were included in the VP decomposition. This system likely exhibits low ionization conditions in the main subsystem, given that it has strong absorption in Mg I and in Ca II. This main feature has been fit with three VP components and shows a typical rotating disk shape as can especially can be seen in the Mg I transitions. There are three high velocity optically thin single VP component subsystems at negative velocities. The total system velocity spread is upward of 400 km/s, which is difficult to understand in terms of a relaxed system of gas in a galaxy potential. The Fe II 2344, 2374, and 2383 transitions were not covered by the HIRES format. The Mn II triplet showed no absorption to the EW(rest) limits given in Table 3.37 It might be worth obtaining a higher signal to noise spectrum of this system because of the confusion and because there may be undetected weak subsystems present.
z=0.934232 |DATA & VOIGT PROFILES| |EWs & AOD COLUMNS| |VP PARAMETERS|The Mg II profiles exhibit the classic "double horn" shape that Lanzetta & Bowen (1992) derived for a simple infall kinematic halo model. The velocity separation of the two main absorbing regions is ~40 km/s. A total of two VP components, one modeling each of the "horns", were fit to the profiles. The Fe II is prominent only in one of the components. Mg I is also present in this particular component, but is not detected in the other. The Ca II 3934, 3969 doublet was not covered by the HIRES format. The Mn II triplet showed no absorption to the EW(rest) limits given in Table 3.38.
Post Thesis WorkFOS/HST data exists, but this quasar has strong BALs, which complicated the analysis of far UV transitions. Nothing reported.
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