The Soft X-ray Properties of "Ordinary" SDSS Galaxies

Details The Soft X-ray Properties of "Ordinary" SDSS Galaxies The Soft X-ray Properties of "Ordinary" SDSS Galaxies

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4604p&link_type=abstract

American Astronomical Society, AAS Meeting #211, #46.04; Bulletin of the American Astronomical Society, Vol. 39, p.801

Mathematics

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Scientific paper

Understanding the X-ray emission of low-luminosity active galactic nuclei is important for constraining the fraction of accreting local supermassive black holes. Low-luminosity active galaxies are often weak X-ray emitters, and identifying their X-ray counterparts in large area surveys is difficult due to source confusion with brighter X-ray sources. We describe a general method for matching sources between high and low resolution surveys that relies on only the positional accuracy of each source measurement. We demonstrate the utility of this method by matching several low resolution surveys to the Sloan Digital Sky Survey (SDSS). By applying this new method to the SDSS main galaxy sample and the ROSAT All Sky Survey (RASS) we are able to quantify the RASS detection rate for galaxies that are not hosting quasars. We provide an electronically available catalog of the match probability for more than 1800 spectroscopically classified galaxies in the SDSS. We present a detailed investigation of the X-ray properties of this catalog of weak X-ray galaxy nuclei. We find that this catalog contains a large number of potential new X-ray Bright Optically Normal Galaxies (XBONGs).

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