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2000ApJ...545..635C - Astrophys. J., 545, 635-656 (2000/December-3)
Anticipating high-resolution STIS spectra of four multiphase Mg II absorbers: a test of photoionization models.
CHARLTON J.C., MELLON R.R., RIGBY J.R. and CHURCHILL C.W.
Abstract (from CDS):
We find that the four Mg II absorbers along the PG 1634+706 line of sight exhibit a variety of Mg II kinematic structures and higher ionization phases. The z=0.8182 system is a single-cloud, weak Mg II absorber without detected C IV in the FOS spectrum [Wr(C IV)<0.07 Å at 3 σ]. The new STIS observations could detect C IV to a higher sensitivity and distinguish between a broad C IV phase and C IV associated with the narrow Mg II cloud. In contrast, the z=0.9056 absorber is a weak, single-cloud system with strong C IV absorption in the FOS spectrum; we infer that it must have supersolar metallicity, depletion of Fe relative to Mg, or an α-group-enhanced abundance pattern. In this system, three phases were required to match the FOS profiles: the narrow b∼3 km.s–1 Mg II cloud phase, a broader b∼20 km.s–1 phase required to produce the observed C IV, and an effective b∼400 km.s–1 phase needed to fit the wings of the Lyα line. The z=0.9902 system is a strong Mg II absorber with five blended components; it has a relatively low metallicity, Z←1, constrained by a strong Lyman limit break; and it also requires a broad b∼40 km.s–1 phase to fit the observed C IV. The z=1.0414 system has four, very weak, blended Mg II clouds and is most unusual in that two components of C IV absorption are apparent, even in the low-resolution FOS spectrum. The redward component is centered on the Mg II, but the stronger component is ∼200 km.s–1 to the blue of the Mg II clouds and thus requires an offset, broad, high-ionization phase.
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Journal keyword(s): Galaxies: Evolution - Galaxies: Halos - Galaxies: Quasars: Absorption Lines
Simbad objects: 2
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