A Supersolar Metallicity Intervening Quasar Absorber at z=0.7

Details A Supersolar Metallicity Intervening Quasar Absorber at z=0.7 A Supersolar Metallicity Intervening Quasar Absorber at z=0.7

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20720302k&link_type=abstract

American Astronomical Society Meeting 207, #203.02; Bulletin of the American Astronomical Society, Vol. 37, p.1501

Astronomy and Astrophysics

Astronomy

Scientific paper

We present high-resolution VLT UVES observations of a sub-damped Lyman-alpha (sub-DLA) system at zabs= 0.7 with super-solar metallicity toward an SDSS quasar. This is the highest metallicity intervening (zabs << zem) quasar absorber currently known, and is only the second super-solar absorber known to date. We derive a Zn abundance of +0.6 dex, while Fe, Cr, Mn, and Ti have abundances of -0.4 to -0.6 dex, indicating that this metal-rich absorber is also dusty. Observations and photoionization models using the CLOUDY software confirm that the gas in this sub-DLA is predominantly neutral. Fe/Zn and Ti/Zn vary among the main velocity components by factors of ˜ 3 and ˜ 35, respectively, indicating non-uniform dust depletion. Mn/Fe is super-solar in almost all components, and varies by a factor of ˜ 3 among the dominant components.
VPK and JM gratefully acknowledge support from the U.S. National Science Foundation grant AST-0206197 to University of South Carolina.

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