Limits on the high redshift growth of massive black holes

Abstract

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 1.5 keV implies a maximum accreted-mass density onto massive black holes of rho_acc < 1.4E4 M_sun Mpc^{-3} for z>5. Considering the contribution of lower-z AGNs, the value reduces to rho_acc < 0.66E4 M_sun Mpc^{-3}. 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 efficient only for black holes hosted by rare galaxies.

5 pages, 1 figure, published in A&A Letters

References in corpus (6)

• A luminous quasar at a redshift of z = 7.085
• The synthesis of the cosmic X-ray background in the Chandra and XMM-Newton era
• The evolution of massive black hole seeds
• A synthesis model for AGN evolution: supermassive black holes growth and feedback modes
• Resolving the Formation of Protogalaxies. II. Central Gravitational Collapse
• Unresolved X-ray background: clues on galactic nuclear activity at z>6

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