Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21942602s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #426.02
Astronomy and Astrophysics
Astronomy
Scientific paper
We present in this paper an analysis of the spectrum of a quasar 2175 Å dust absorber in the SDSS DR7 data. The spectrum shows clear detection of molecular hydrogen absorption bands in the near UV wavelengths and neutral carbon absorption lines in the optical wavelengths. The measured equivalent widths of CI λ 1656 and 1560 Å lines and the v = 0-0, 1-0, 2-0, and 3-0 Lyman bands of molecular hydrogen are among the strongest ones in high redshift quasar absorbers ever detected. The [Zn II] and [Cr II] measurements indicate that this system is a metal rich system and a heavily dust depleted system, consistent with the strong 2175 Å dust extinction bump detected in this system. All of the measurements indicate that this may be a Milky Way analog in the early universe.
Ge Jian
Grafer E.
Murrah A.
Steinke Michael
Zhou Hua
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