Chandra deciphers the Optically 'Dull' X-ray Bright Galaxies at z~0.

Details Chandra deciphers the Optically 'Dull' X-ray Bright Galaxies at z~0. Chandra deciphers the Optically 'Dull' X-ray Bright Galaxies at z~0.

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cxo..prop.2888c&link_type=abstract

Chandra proposal ID #11700706

Physics

Scientific paper

X-ray Bright Optically Normal Galaxies (XBONGs) are a rare puzzle in the AGN menagerie, showing AGN-like X-ray luminosity (logLx>42) but no optical line emission. Are they optically passive because of host galaxy dilution in the spectroscopic apertures? Obscuration by circumnuclear dust? Or are they instead X-ray bright due to radiatively inefficient accretion flows (RIAFs) which lack an ionizing UV bump? Or X-ray flaring? Or extended emission from hot gas? XBONGs to date have redshifts too high or S/N too low for reliable classification or detailed study. For a small carefully-vetted sample of local XBONGs from the SDSS and ROSAT All Sky Survey, we propose to use Chandra X-ray fluxes, morphologies, and spectra to test all 5 hypotheses.

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