No evidence of obscured, accreting black holes in most z = 6 star-forming galaxies

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DOIResolve DOI: http://doi.org/10.1088/2041-8205/742/1/L8
AuthorSearch for:
TypeArticle
Journal titleThe Astrophysical Journal Letters
ISSN2041-8205
Volume742
Issue1
PagesL8-1L8-4; # of pages: 4
Subjectcosmology: observations; galaxies: active; galaxies: high-redshift; X-rays: galaxies
AbstractIt 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 that 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 as to why the z = 6 black hole mass function has such a flat slope and a low normalization compared to the stellar mass function.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Herzberg Institute of Astrophysics
Peer reviewedYes
NPARC number19688676
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Record identifier60a3d889-0722-4b97-a9f9-e257fa166c4e
Record created2012-03-19
Record modified2016-05-09
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