Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..801...51w&link_type=abstract
ASTROPHYSICAL SOURCES OF HIGH ENERGY PARTICLES AND RADIATION. AIP Conference Proceedings, Volume 801, pp. 51-56 (2005).
Astronomy and Astrophysics
Astrophysics
3
X-Ray Sources (Astronomical), Galactic Nuclei, X-Ray Sources, X-Ray Bursts, X-Ray, Background Radiations, Active And Peculiar Galaxies And Related Systems
Scientific paper
We have stacked the X-ray emission from X-ray-detected sources in ~ 3.8 Ms of Chandra Deep Field and XMM-Newton Lockman Hole observations. The fraction of the X-ray background which can be resolved into point sources is ~ 70-90% up to 4 keV. In the 6-8 keV band this fraction decreases to ~ 50-70% and XMM-Newton indicates only ~ 40-60% in the 8-12 keV range. The unresolved fraction is consistent with an undiscovered population of highly obscured AGN. To attempt to uncover this population we proceeded to stack the X-ray emission from the X-ray-undetected optical sources in the Chandra Deep Fields, using Hubble source positions from the Great Observatories Origins Deep Survey. In the 0.5-6 keV range the stacked-source emission corresponds to the remaining 10-20% of the X-ray background. In the 6-8 keV band we find upper limits to the stacked X-ray flux consistent with the remaining ~ 40% of the background, but the errors are too large to claim a detection of the obscured AGN population.
Alexander Dave M.
Bauer Franz Erik
Brandt Wiliam N.
Fabian Andrea C.
Hasinger Guenter
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