The nature of the sources of the X-ray and infrared backgrounds

Details The nature of the sources of the X-ray and infrared backgrounds The nature of the sources of the X-ray and infrared backgrounds

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.2106c&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #21.06; Bulletin of the American Astronomical Society, Vol. 32, p.1213

Astronomy and Astrophysics

Astronomy

Scientific paper

We present optical, infrared and radio follow-up observations of the hard X-ray selected sources discovered by BeppoSAX and Chandra surveys. The multiwavelength data indicate that at least half of the X-ray sources are ``intermediate'' AGN, i.e. type 1.8-1.9 AGN, ``red" quasars, and even a few broad line, blue continuum quasars, all obscured in X-rays by columns of the order of 1022-23.5 cm-2, but showing a wide dispersion in their optical extinction properties. Intriguingly, we also find a few X-ray bright optically dull galaxies. We discuss how our findings can help in discriminating among competing scenarios for the synthesis of the hard X-ray background. The present data are also used to compute the contribution of the hard X-ray sources to the far--infrared background. This work is supported by the MURST grant Cofin 98--02--32 and by the ASI contract ASI--ARS--99--75.

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