%0 Journal Article
%T The Case for Supercritical Accretion onto Massive Black Holes at High Redshift
%+ Institut d'Astrophysique de Paris (IAP)
%+ Institut de Planétologie et d'Astrophysique de Grenoble (IPAG )
%A Volonteri, Marta
%A Silk, Joseph
%A Dubus, Guillaume
%< avec comité de lecture
%@ 0004-637X
%J The Astrophysical Journal
%I American Astronomical Society
%V 804
%8 2015
%D 2015
%Z 1401.3513
%Z 2015ApJ...804..148V
%R 10.1088/0004-637X/804/2/148
%K accretion
%K accretion disks
%K galaxies: high-redshift
%K quasars: supermassive black holes
%K Astrophysics - Astrophysics of Galaxies
%K Astrophysics - Cosmology and Nongalactic Astrophysics
%K Astrophysics - High Energy Astrophysical Phenomena
%Z Sciences of the Universe [physics]Journal articles
%X Short-lived intermittent phases of super-critical (super-Eddington) growth, coupled with star formation via positive feedback, may account for early growth of massive black holes (MBH) and coevolution with their host spheroids. We estimate the possible growth rates and duty cycles of these episodes, both assuming slim accretion disk solutions and adopting the results of recent numerical simulations. The angular momentum of gas joining the accretion disk determines the length of the accretion episodes and the final mass that an MBH can reach. The latter can be related to the gas velocity dispersion and, in galaxies with low-angular momentum gas, the MBH can reach a higher mass. When the host galaxy is able to sustain inflow rates at 1-100 {{M}⊙ } y{{r}-1}, replenishing and circulation lead to a sequence of short (∼ {{10}4}-{{10}7} yr), heavily obscured accretion episodes that increase the growth rates, with respect to an Eddington-limited case, by several orders of magnitude. Our model predicts that the ratio of the MBH accretion rate-to-star formation rate is 10-2 or higher, leading, at early epochs, to a ratio of MBH-to-stellar mass that is higher than the “canonical” value of ∼ {{10}-3}, which is in agreement with current observations. Our model makes specific predictions that long-lived super-critical accretion occurs only in galaxies with copious low-angular momentum gas, and, in this case, the MBH is more massive at a fixed velocity dispersion.
%G English
%L insu-03644961
%U https://insu.hal.science/insu-03644961
%~ INSU
%~ UNIV-SAVOIE
%~ UGA
%~ CNRS
%~ UNIV-GRENOBLE1
%~ INPG
%~ IRSTEA
%~ CNES
%~ OSUG
%~ IAP
%~ IPAG
%~ AGREENIUM
%~ SORBONNE-UNIVERSITE
%~ SU-INF-2018
%~ SU-SCIENCES
%~ INRAE
%~ USMB-COMUE
%~ SU-TI
%~ ALLIANCE-SU