2012A&A...545L...6S

Query : 2012A&A...545L...6S

2012A&A...545L...6S - Astronomy and Astrophysics, volume 545L6-6 (2012/9-1)

Limits on the high redshift growth of massive black holes.

SALVATERRA R., HAARDT F., VOLONTERI M. and MORETTI A.

Abstract (from CDS):

We place firm upper limits on the global accretion history of massive black holes at z>5 from the recently measured unresolved fraction of the cosmic X-ray background. The maximum allowed unresolved intensity observed at 1.5keV implies a maximum accreted-mass density onto massive black holes of ρacc≲1.4x104M☉M/pc3 for z>5. Considering the contribution of lower-z AGNs, the value reduces to ρacc≲0.66x104M☉M/pc3. The tension between the need for the efficient and rapid accretion required by the observation of massive black holes already in place at z>7 and the strict upper limit on the accreted mass derived from the X-ray background may indicate that black holes are rare in high redshift galaxies or that accretion is only efficient for the black holes hosted by rare galaxies.

Abstract Copyright: ∼

Journal keyword(s): cosmology: observations - X-rays: diffuse background - galaxies: active

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1

Query : 2012A&A...545L...6S

Basic data :
NAME Chandra Deep Field-South -- Region defined in the Sky
Other object types: otypes_help 		reg ()
ICRS coord. (ep=J2000) : 		03 32 28.0 -27 48 30 [ ] D 2001ApJ...551..624G
FK4 coord. (ep=B1950 eq=1950) : 		03 30 22.4 -27 58 35 [ ]
Gal coord. (ep=J2000) : 		223.5732 -54.4374 [ ]
Angular size (arcmin): 		15.84 15.84 ~ (~) D ~
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Identifiers (4) :
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NAME Chandra Deep Field-South NAME CDFS NAME CDF-S NAME Chandra Deep Field South

References (2282 between 1850 and 2026) (Total 2282)
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