Galaxies in front of Quasars: Mrk 1456 and SDSS J114719.90+522923.2

Details Galaxies in front of Quasars: Mrk 1456 and SDSS J114719.90+522923.2 Galaxies in front of Quasars: Mrk 1456 and SDSS J114719.90+522923.2

2006-07-17

arxiv.org/abs/astro-ph/0607385v1

Astron.J.132:1844-1850,2006

Astronomy and Astrophysics

Astrophysics

23 pages, 4 figures, accepted for publication in AJ

Scientific paper

10.1086/507789

The chance projection of the disk of Mrk~1456 onto a background QSO is similar to the case of SBS 1543+593/HS 1543+5921. Mrk~1456 is a luminous, late-type spiral at z ~ 0.05. Though the QSO, SDSS J114719.90+522923.2 at z ~ 2, has not yet been observed with ultraviolet spectroscopy, it shows strong Ca II absorption at the redshift of Mrk 1456 which gives evidence that it is a possible Damped Lyman Alpha absorber. Spectroscopy of the star-forming nucleus of Mrk~1456 allows us to apply emission-line diagnostics to infer the chemical abundances at the center of the galaxy, and to make a prediction of the expected metallicity on the sightline to the QSO.

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