Chandra's View of Local Optically "Dull'' X-ray Bright Galaxies

Details Chandra's View of Local Optically "Dull'' X-ray Bright Galaxies Chandra's View of Local Optically "Dull'' X-ray Bright Galaxies

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.2205h&link_type=abstract

American Astronomical Society, HEAD meeting #12, #22.05

Astronomy and Astrophysics

Astronomy

Scientific paper

Why do some luminous X-ray sources (log Lx [erg/s] > 42, rest-frame 2-8 keV) lack any detectable optical emission lines? Such high X-ray luminosities typically suggest power from accretion onto supermassive black holes, which produce copious UV photons to photoionize the line-emitting circumnuclear gas, or a large amount of dark matter, which can bind more hot gas for a given optical luminosity. Competing explanations for these high X-ray luminosity, line-less sources include: (1) optical dilution by the host galaxy starlight, (2) obscuration, (3) radiatively inefficient accretion flows, (4) X-ray variability, or (5) extended hot gas. Resolving this puzzle is crucial for understanding the AGN phenomenon and its cosmic evolution, and the completeness of optically-selected samples. We present new -- and perhaps surprising -- Chandra observations of eight candidate Optically Dull X-ray Bright Galaxies at low redshift (z 0.3), identified with ROSAT and SDSS.

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