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Q 1548+093
V = 17.5; z = 2.749; exp = 3600 s; coverage = 3766.2-5791.3
A spectrum of this QSO has been studied by SBS. They reported a weak, but unambiguous, Mg II absorbing system at z = 0.7708, which has been observed in the HIRES spectrum. This spectrum also has three C IV absorbers at z > 2 (see Ganguly et al. 1999). The HIRES spectrum also covers the Ly-alpha forest below 4600 A. Unfortunately, the signal to noise in the HIRES spectrum is quite low, ~9, at the Mg II 2796 transition. Thus, this system has not been included in Sample B of this study.
z=0.770300 |DATA & VOIGT PROFILES| |EWs & AOD COLUMNS| |VP PARAMETERS|
The HIRES spectrum is noisy and the detected absorption profiles suffer from unresolved saturation. The full width of the Mg II profile is ~40 km/s. A single VP component has been fit to the observed profiles. However, the residuals are systematically positive for v < 0 km/s, which may indicate a redward asymmetry (a hidden VP component). If there are subsystems with EW(rest) < 0.05 A, they cannot be detected. However, there is a suggestion of narrow depressions in both doublet transitions at v ~80 km/s and at -90 < v < -60 km/s, but neither of these can be distinguished from noise. The Mg I transition and the Fe II 2600 transition have been detected. The Ca II 3934, 3969 doublet was not covered by the HIRES format. The Mn II triplet and all other Fe II transitions showed no absorption to the EW(rest) limits given in Table 3.47. These EW(rest) limits are not very stringent.
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