منابع مشابه
Rapid growth of high redshift black holes
We discuss a model for the early assembly of supermassive black holes (SMBHs) at the center of galaxies that trace their hierarchical build-up far up in the dark halo ‘merger tree’. Motivated by the observations of luminous quasars around redshift z ≈ 6 with SMBH masses ≈ 10M⊙, we assess the possibility of an early phase of stable super-critical quasi-spherical accretion in the BHs hosted by me...
متن کاملAdiabatic Growth of Massive Black Holes
We discuss the process of adiabatic growth of central black holes in the presence of a stationary, pre-existing distribution of collisionless stars. Within the limitations of the assumptions, the resulting models make robust physical predictions for the presence of a central cusp in the stellar and dark matter density, a Keplerian rise in the velocity dispersion, and a significant tangential po...
متن کاملThe obscured growth of massive black holes
The mass density of massive black holes observed locally is consistent with the hard X-ray Background provided that most of the radiation produced during their growth was absorbed by surrounding gas. A simple model is proposed here for the formation of galaxy bulges and central black holes in which young spheroidal galaxies have a significant distributed component of cold dusty clouds which acc...
متن کاملFeedback Limits Rapid Growth of Seed Black Holes at High Redshift
Seed black holes formed in the collapse of population III stars have been invoked to explain the presence of supermassive black holes at high redshift. It has been suggested that a seed black hole can grow up to 10M⊙ through highly super-Eddington accretion for a period of ∼ 106∼7 yr between redshift z = 20∼ 24. We studied the feedback of radiation pressure, Compton heating and outflow during t...
متن کاملRapid growth of seed black holes in the early universe by supra-exponential accretion.
Mass accretion by black holes (BHs) is typically capped at the Eddington rate, when radiation's push balances gravity's pull. However, even exponential growth at the Eddington-limited e-folding time t(E) ~ few × 0.01 billion years is too slow to grow stellar-mass BH seeds into the supermassive luminous quasars that are observed when the universe is 1 billion years old. We propose a dynamical me...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2005
ISSN: 0004-637X,1538-4357
DOI: 10.1086/466521