Extending the ChaMP/SDSS Field AGN Fraction

Details Extending the ChaMP/SDSS Field AGN Fraction Extending the ChaMP/SDSS Field AGN Fraction

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21712507h&link_type=abstract

American Astronomical Society, AAS Meeting #217, #125.07; Bulletin of the American Astronomical Society, Vol. 43, 2011

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The most reliable signature of accretion in active galaxies is strong X-ray emission. To study the field AGN fraction to z = 0.7, we employ >100,000 SDSS galaxies and 1,600 Chandra X-ray detections from the Chandra Multiwavelength Project (ChaMP). ChaMP volume completeness maps allow us to investigate the AGN fraction as a function of host galaxy properties, including absolute magnitude, X-ray luminosity, redshift, and color/morphological type, for samples complete in redshift and i-band magnitude (Mi). Conservatively defining AGN via log Lx(0.5-8keV) > 42, and weighting by the optical luminosity function (OLF) for galaxies, we find that about 1 in 150 galaxies with -18 > Mi > -26 host an active nucleus. At low redshift (z < 0.4), for bins comparable to previous cluster studies, we find no significant difference between the field and cluster AGN fractions. We use the OLF-weighted AGN fraction to compare these environments out to z 1.

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