The Nature of X-ray Bright Optically Normal Galaxies

Details The Nature of X-ray Bright Optically Normal Galaxies The Nature of X-ray Bright Optically Normal Galaxies

2004-01-08

arxiv.org/abs/astro-ph/0401117v2

Astrophys.J. 612 (2004) 724-728

Astronomy and Astrophysics

Astrophysics

15 pages, 3 figures, the final version accepted by ApJ; substantially shortened but new material added

Scientific paper

10.1086/422802

Recent X-ray surveys by {\it Chandra} and {\it XMM-Newton} have revealed a population of X-ray bright, optically normal galaxies (XBONGs) at moderate redshifts. We propose that many XBONGs are powered by an inner radiatively inefficient accretion flow (RIAF) plus an outer radiatively efficient thin accretion disk. The absence of optical/UV activity in XBONGs is explained by the truncation of the thin disk near the black hole, while the relatively strong X-ray emission is explained as inverse Compton emission from the hot RIAF. As an example, we show that the spectra of two XBONGs can be fit fairly well with such a model. By comparing these two sources to other accreting black holes, we argue that XBONGs are intermediate in their characteristics between distant luminous active galactic nuclei and nearby low-luminosity nuclei.

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