Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.3504w&link_type=abstract
American Astronomical Society, HEAD meeting #8, #35.04; Bulletin of the American Astronomical Society, Vol. 36, p.972
Astronomy and Astrophysics
Astronomy
Scientific paper
Most of the soft, and a growing fraction of the harder X-ray background has been resolved into emission from point sources; yet the resolved fraction above ˜5 {keV} has only been poorly constrained. We use the deep XMM-Newton 700 {ks} observation of the Lockman Hole, and a photometric approach, to estimate the total flux attributable to resolved sources in a number of different energy bands. We find the resolved fraction to be nearly ˜100% in the soft bands at or below 2 {keV}, but this decreases rapidly above ˜5 {keV} to ˜50-70%. The available photometry from the Chandra Deep Fields North and South is able to confirm this trend; with indications of an unresolved source population emerging at hard energies. The unresolved background component has the spectral signature of a population of highly obscured AGN. Finally, we report on the progress we have made in trying to identify and analyse the missing sources.
Barcons Xavier
Brunner Hermann
Fabian Andrea C.
Hasinger Guenter
Mateos Silvia
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