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Q 0823-223
V = 15.7; z = >0.911; exp = 3600 s; coverage = 3977.8-6411.8 A
This QSO, a luminous BL Lacertae object, has been studied in some detail by Falamo (1990), though its redshift remains quite uncertain, and by Veron-Cetty et al. (1990). A spectrum of this QSO was previously studied by Condon, Hicks, & Jauncey (1977). Falamo reported a strong Mg II doublet at z = 0.9103. A Mg II system at z = 0.7055 has been discovered in the HIRES spectrum.
z=0.705472 |DATA & VOIGT PROFILES| |EWs & AOD COLUMNS| |VP PARAMETERS|
There appears to be no prior report of this system in the literature. Except for the Ca II doublet, all the transitions listed in Table 2.1 were observed, though the signal to noise ratio of the Fe II 2344, 2374, and 2383 transitions was fairly low, ~7. Only the Mg II doublet was detected at the limits given in Table 3.22. The absorption is clearly on the linear part of the curve of growth. The profile has a somewhat asymmetric shape to it, though it was formally fit with a single VP component.
z=0.911017 |DATA & VOIGT PROFILES| |EWs & AOD COLUMNS| |VP PARAMETERS|This system was first reported by Falamo (1990) and was found to be a "double" system by Veron-Cetty et al. (1990). It is very complex, strong, and kinematically spread out over ~350 km/s. The profile shapes are suggestive of a scenario proposed by Heahnelt, Steinmetz, & Rauch (1996), in which the absorbing gas may be part of an extended "filamentary" structure that is being probed along the principal axis in the region of a small group of galaxies. This system, in particular, would be interesting to study in detail to see if such a supposition is correct, or if there is only a single associated galaxy [as had been found for the z = 0.8514 system in the Q 0002+051 field (Steidel, private communication)]. J. Surdjen (Veron-Cetty et al. 1990) took an R-band image of the field only to find that an observed companion was a zero redshift star. The Ca II doublet was not observed because it was off the HIRES format. Also, the Mg II 2803 transition was only partially observed. Three kinematic subsystems were measured, one a single component that could in fact be associated with the larger absorption complex spread over 105-185 km/s. A total of 18 VP components were fit to the system.
Post Thesis WorkFOS/HST data have been investigated.
See Churchill et al. (2000a)
See Churchill et al. (2000b)
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