In addition to the primary SDSS photometry and spectroscopy, there are a few extra catalogs created by our collaborators that are distributed through the SAS. These Value-Added Catalogs (VACs) are listed below, and include catalogs that were released in earlier data releases.
XDQSO
Quasar probability distributions for target selection in color-color space, based on extreme deconvolution methods.
Abstract
This value added catalog contains quasar probabilities in three redshift ranges derived using the extreme deconvolution XDQSO technique, as described in Bovy et al. (2011). The quasar probabilities are assigned based on models for the underlying flux distributions of quasars and stars applied to the single-epoch ugriz fluxes of all 160,904,060 point-sources with dereddened i-band magnitude between 17.75 and 22.45 mag in DR8.
Catalog last modified: 2021-12-06 07:36:54