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Date and Time of the Query: 2019-05-25 T21:15:20 PDT
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For refcode 2011AJ....142..122C:
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2011AJ....142..122C Ca II and Na I Quasar Absorption-line Systems in an Emission-selected Sample of SDSS DR7 Galaxy/Quasar Projections. I. Sample Selection Cherinka, B.; Schulte-Ladbeck, R. E. Abstract. The aim of this project is to identify low-redshift host galaxies of quasar absorption-line systems by selecting galaxies that are seen in projection onto quasar sightlines. To this end, we use the Seventh Data Release of the Sloan Digital Sky Survey to construct a parent sample of 97,489 galaxy/quasar projections at impact parameters of up to 100 kpc to the foreground galaxy. We then search the quasar spectra for absorption-line systems of Ca II and Na I within +/-500 km s^--1^ of the galaxy's velocity. This yields 92 Ca II and 16 Na I absorption systems. We find that most of the Ca II and Na I systems are sightlines through the Galactic disk, through high-velocity cloud complexes in our halo, or Virgo Cluster sightlines. Placing constraints on the absorption line rest equivalent width significance (>=3.0{sigma}), the local standard of rest velocity along the sightline (>=345 km s^--1^), and the ratio of the impact parameter to the galaxy optical radius (<=5.0), we identify four absorption-line systems that are associated with low-redshift galaxies at high confidence, consisting of two Ca II systems (one of which also shows Na I) and two Na I systems. These four systems arise in blue, ~L*_ r_ galaxies. Tables of the 108 absorption systems are provided to facilitate future follow-up. Key words: catalogs, galaxies: general, quasars: absorption lines, quasars: individual: Ca II Na I
Retrieve 14910 NED objects in this reference.
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