2003ApJ...589..111C -
Astrophys. J., 589, 111-125 (2003/May-3)
High-resolution STIS/Hubble Space Telescope and HIRES/Keck spectra of three weak Mg II absorbers toward PG 1634+706.
CHARLTON J.C., DING J., ZONAK S.G., CHURCHILL C.W., BOND N.A. and RIGBY J.R.
Abstract (from CDS):
High-resolution optical (HIRES/Keck) and UV (STIS/Hubble Space Telescope) spectra, covering a large range of chemical transitions, are analyzed for three single-cloud weak Mg II absorption systems along the line of sight toward the quasar PG 1634+706. Weak Mg II absorption lines in quasar spectra trace metal-enriched environments that are rarely closely associated with the most luminous galaxies (>0.05L*). The two weak Mg II systems at z=0.81 and 0.90 are constrained to have at least solar metallicity, while the metallicity of the z=0.65 system is not as well constrained, but is consistent with more than 1/10 solar. These weak Mg II clouds are likely to be local pockets of high metallicity in a lower metallicity environment. All three systems have two phases of gas, a higher density region that produces narrower absorption lines for low-ionization transitions, such as Mg II, and a lower density region that produces broader absorption lines for high-ionization transitions, such as C IV. The C IV profile for one system (at z=0.81) can be fitted with a single broad component (b∼10 km/s), but those for the other two systems require one or two additional offset high-ionization clouds. Two possible physical pictures for the phase structure are discussed: one with a low-ionization, denser phase embedded in a lower density surrounding medium and the other with the denser clumps surrounding more highly ionized gas.
Abstract Copyright:
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Journal keyword(s):
Galaxies: Evolution - Galaxies: Halos - Galaxies: Quasars: Absorption Lines
Nomenclature:
Table 2: [CDZ2003] QSO J1634+7031 abs N.NNNN N=3.
Simbad objects:
1
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