The X-ray AGN Fraction to z=0.7 from the Chandra Multiwavelength Project and the Sloan Digital Sky Survey

Details The X-ray AGN Fraction to z=0.7 from the Chandra Multiwavelength Project and the Sloan Digital Sky Survey The X-ray AGN Fraction to z=0.7 from the Chandra Multiwavelength Project and the Sloan Digital Sky Survey

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.0825h&link_type=abstract

American Astronomical Society, HEAD meeting #11, #8.25; Bulletin of the American Astronomical Society, Vol. 41, p.666

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The Chandra Multiwavelength Project (ChaMP) has carefully analyzed 323 Chandra fields (about 30 square deg) that overlap the SDSS and characterized all optical/X-ray matches. X-ray emission is the most reliable primary signature of AGN activity. To study the field AGN fraction out to z=0.7, we employ spectroscopic redshifts from SDSS and our own ChaMP spectroscopy, as well as photometric redshifts from several SDSS catalogs. Our parent sample consists of more than 100,000 SDSS galaxies and nearly 1,600 Chandra X-ray detections. Detailed ChaMP volume completeness maps allow us to investigate the local AGN fraction as a function of absolute optical magnitude, X-ray luminosity, redshift, and color/morphological type.
We find that about one percent of field galaxies with absolute SDSS i-band magnitude more luminous than -20 are AGN, defined as having log Lx(0.5-8keV)>42. We find no significant difference between the ChaMP field AGN fraction and the Chandra cluster AGN fraction, for samples restricted to similar redshift and absolute magnitude ranges. At low redshift, apparent X-ray point source overdensities toward clusters thus simply track the cluster galaxy overdensity.

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