SIMBAD references

2011AJ....142..122C - Astron. J., 142, 122 (2011/October-0)

Ca II and Na I quasar absorption-line systems in an emission-selected sample of SDSS DR7 Galaxy/Quasar projections. I. Sample selection.


Abstract (from CDS):

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 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 ( ≥ 3.0σ), the local standard of rest velocity along the sightline ( ≥ 345 km/s), 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*rgalaxies. Tables of the 108 absorption systems are provided to facilitate future follow-up.

Abstract Copyright:

Journal keyword(s): catalogs - galaxies: general - quasars: absorption lines (Ca II, Na I)

VizieR on-line data: <Available at CDS (J/AJ/142/122): table1.dat table5.dat table6.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 71

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