VizieR Online Data Catalog: Pittsburgh SDSS Mg II QSO catalog (Quider+, 2011)

In this paper, we present the current state of our SDSS Mg II absorber catalog, which is presently complete through SDSS Data Release Four (DR4, Cat. II/267). As noted above, this contribution represents a continuation of the work presented by Nestor et al. (2005ApJ...628..637N, hereafter NTR05) in that we used the method of NTR05; however, we did not use their measurements of the early data release (EDR) Mg II absorbers. The catalog contains ~17000 absorbers in the redshift interval 0.36<=z<=2.28 identified in ~44600 SDSS quasar spectra. The catalog, along with other information (Section 4), is now publicly available at http://enki.phyast.pitt.edu/PittSDSSMgIIcat.php. We used four criteria to define the quasar sample: (1) a spectral classification of 3 or 4, which correspond to QSO or HIZ-QSO, respectively, (2) z>0.36 to ensure visibility of the Mg II λλ2796, 2803 doublet at the SDSS low wavelength limit of 3820 Å, (3) zstatus>1 to eliminate missing or failed redshift measurements, and (4) i<20 for the fiber magnitude. Incorporating these criteria into an SQL query of the SpecPhoto view yielded ~44600 quasars.

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