X-ray Bright Optically Normal Galaxies (XBONGs) in the XBootes Field

Details X-ray Bright Optically Normal Galaxies (XBONGs) in the XBootes Field X-ray Bright Optically Normal Galaxies (XBONGs) in the XBootes Field

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916108a&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #161.08; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We analyze a sample of 258 X-ray Bright Optically Normal Galaxies (XBONGs) in the XBootes Field by far the largest sample of XBONGs ever studied. These galaxies show X-ray emission characteristic of accretion onto a supermassive black hole, but lack any detected optical emission lines expected for active galaxies. We examine the sample using X-ray, optical, near-infrared, and radio photometry, comparing the XBONGs to a sample of 218 normal active galaxies in the same field. Both samples extend out to z=1. We find a heterogeneous population of XBONGs comprising the early-type galaxies noted in previous studies as well as a number of blue elliptical, spiral, irregular, and interacting galaxies. We test the observational data against three prominent models of XBONG behavior: obscuration of the nuclear light by dust in the host galaxy, dilution of the emission lines by stellar light in the host galaxy, and a weak ionizing continuum from the accretion disk because of an Advection-Dominated Accretion Flow (ADAF) in the disk. We find evidence for all three of these models in our sample of XBONGs.

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