Exploring the Variable Sky with SDSS

Details Exploring the Variable Sky with SDSS Exploring the Variable Sky with SDSS

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2805s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #28.05; Bulletin of the American Astronomical Society, V

Statistics

Scientific paper

We quantify the variability of faint unresolved optical sources using a catalog based on multiple SDSS imaging observations. The catalog covers the so-called equatorial stripe 82 (Dec<1.27 deg) in the RA range 20h 34' to 4h 00', and contains 58 million photometric observations in the SDSS ugriz system for 1.4 million sources that were observed at least 3 times in each of the gri bands. In each photometric bandpass we compute various photometric statistics such as rms scatter, chi-square per degree of freedom, skewness, kurtosis, minimum and maximum observed magnitude, and use them to select and study variable sources. We find that at least 2% of faint optical sources appear variable at the 0.05 mag level simultaneously in the g and r bands. About 80% of the variable population are quasars and RR Lyrae stars, although they represent only 3.5% of the sources in the adopted magnitude-limited sample (g<20.5). We will discuss in detail our selection methods and the distribution of sources in the multi-dimensional magnitude-color-variability space.

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