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The HELLAS2XMM survey: II. Multiwavelength observations of P3: an X-ray bright, optically inactive galaxy

By A. Comastri, M. Mignoli, P. Ciliegi, P. Severgnini, R. Maiolino, M. Brusa, F. Fiore, A. Baldi, S. Molendi, R. Morganti, C. Vignali, F. La Franca, G. Matt and G. C. Perola


Recent X-ray surveys have clearly demonstrated that a population of optically dull, X-ray bright galaxies is emerging at 2-10 keV fluxes of the order of 10^{-14} erg cm^{-2} s^{-1}. Although they might constitute an important fraction of the sources responsible for the hard X-ray background, their nature is still unknown. With the aim to better understand the physical mechanisms responsible for the observed properties, we have started an extensive program of multiwavelength follow-up observations of hard X-ray, optically quiet galaxies discovered with XMM-Newton. Here we report the results of what can be considered the first example of this class of objects: CXOUJ031238.9-765134, originally discovered by Chandra, and optically identified by Fiore et al. (2000) with an apparently normal early-type galaxy at z=0.159, usually known as "FIORE P3". The analysis of the broad-band energy distribution suggests the presence of a heavily obscured active nucleus.Comment: 7 pages, 5 figures included, LaTeX emulateapj5.sty, accepted for publication by The Astrophysical Journa

Topics: Astrophysics
Publisher: 'University of Chicago Press'
Year: 2002
DOI identifier: 10.1086/340016
OAI identifier:

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