Hard sources, their colors, and the X-ray background

Details Hard sources, their colors, and the X-ray background Hard sources, their colors, and the X-ray background

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..599..554c&link_type=abstract

X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. Edited by Nicholas E. White, Giuseppe Malaguti, and G

Astronomy and Astrophysics

Astronomy

1

X-Ray Sources, X-Ray Bursts, Background Radiations, Galactic Nuclei, Circumnuclear Matter, And Bulges

Scientific paper

The unresolved soft and hard X-ray backgrounds (XRB) are produced by hard extragalactic sources of unknown nature. We have assembled a sample of hard sources in Rosat pointings that offer a preview of the properties of these sources. We present here optical and infrared photometry of both unidentified and identified objects in this sample. Our data provide evidence for absorption as the origin of the hard spectra of these sources. Furthermore, the unidentified sources have the same optical and X-ray colors as the identified ones, so they are probably the same population. Since most of the extragalactic identified sources in our sample are broad line AGN, our survey supports the idea of obscured AGN as the main sources of the (soft) XRB. .

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