Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-10-18
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
4 pages, 2 figures, ApJ Letters, in press
Scientific paper
It has been claimed that there is a large population of obscured, accreting black holes at high-redshift and that the integrated black hole density at z=6 as inferred from X-ray observations is ~100 times greater than inferred from optical quasars. I have performed a stacking analysis of very deep Chandra X-ray data at the positions of photometrically-selected z=6 galaxy candidates. It is found that there is no evidence for a stacked X-ray signal in either the soft (0.5-2 keV) or hard (2-8 keV) X-ray bands. Previous work which reported a significant signal is affected by an incorrect method of background subtraction which underestimates the true background within the target aperture. The puzzle remains of why the z=6 black hole mass function has such a flat slope and a low normalization compared to the stellar mass function.
No associations
LandOfFree
No evidence of obscured, accreting black holes in most z=6 star-forming galaxies 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 No evidence of obscured, accreting black holes in most z=6 star-forming galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and No evidence of obscured, accreting black holes in most z=6 star-forming galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-596466