Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-02-27
Mon.Not.Roy.Astron.Soc.368:1735-1741,2006
Astronomy and Astrophysics
Astrophysics
7 pages, 1 figure, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10240.x
The emission from individual X-ray sources in the Chandra Deep Fields and XMM-Newton Lockman Hole shows that almost half of the hard X-ray background above 6 keV is unresolved and implies the existence of a missing population of heavily obscured active galactic nuclei (AGN). We have stacked the 0.5-8 keV X-ray emission from optical sources in the Great Observatories Origins Deep Survey (GOODS; which covers the Chandra Deep Fields) to determine whether these galaxies, which are individually undetected in X-rays, are hosting the hypothesised missing AGN. In the 0.5-6 keV energy range the stacked-source emission corresponds to the remaining 10-20 per cent of the total background -- the fraction that has not been resolved by Chandra. The spectrum of the stacked emission is consistent with starburst activity or weak AGN emission. In the 6-8 keV band, we find that upper limits to the stacked X-ray intensity from the GOODS galaxies are consistent with the ~40 per cent of the total background that remains unresolved, but further selection refinement is required to identify the X-ray sources and confirm their contribution.
Alexander Dave M.
Bauer Franz Erik
Brandt Wiliam N.
Fabian Andrea C.
Lehmer Bret D.
No associations
LandOfFree
Can the unresolved X-ray background be explained by emission from the optically-detected faint galaxies of the GOODS project? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Can the unresolved X-ray background be explained by emission from the optically-detected faint galaxies of the GOODS project?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Can the unresolved X-ray background be explained by emission from the optically-detected faint galaxies of the GOODS project? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-387559