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- W1985874059 abstract "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." @default.
- W1985874059 created "2016-06-24" @default.
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- W1985874059 date "2011-10-31" @default.
- W1985874059 modified "2023-09-23" @default.
- W1985874059 title "NO EVIDENCE OF OBSCURED, ACCRETING BLACK HOLES IN MOST z = 6 STAR-FORMING GALAXIES" @default.
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- W1985874059 doi "https://doi.org/10.1088/2041-8205/742/1/l8" @default.
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