No Quasar Left Behind

Details No Quasar Left Behind No Quasar Left Behind

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924328m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #243.28

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Scientific paper

Quasars are key astrophysical objects and cosmological probes. Using a selection method based on a "damped random walk" model, we obtained SDSS-III BOSS spectra of 1500 unresolved sources in the SDSS Stripe 82, which exhibit photometric variability statistically similar to the variability of spectroscopically confirmed quasars. The targets were selected from 11,000 variable sources with 16.2 < i < 20.5. Our selection criteria were deliberately liberal, i.e., we aim for completeness rather than purity. The bright subset (i < 19) tests the completeness of the color-selected SDSS sample, while the faint subset represents a highly complete sample selected using a uniform photometric dataset and well-defined criteria. This new sample, as we show, verifies that quasars can be selected in a highly efficient manner (>95% purity) based on light curve information only, and that these light curves can be distinguished from those of variable stars with very little contamination.

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