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http://hdl.handle.net/20.500.12386/26189
Title: | Super-Eddington growth of the first black holes | Authors: | Pezzulli, EDWIGE VALIANTE, ROSA SCHNEIDER, RAFFAELLA |
Issue Date: | 2016 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 458 | Issue: | 3 | First Page: | 3047 | Abstract: | The assembly of the first super massive black holes (SMBHs) at z ≳ 6 is still a subject of intense debate. If black holes (BHs) grow at their Eddington rate, they must start from ≳10<SUP>4</SUP> M<SUB>☉</SUB> seeds formed by the direct collapse of gas. Here, we explore the alternative scenario where ∼100 M<SUB>☉</SUB> BH remnants of the first stars grow at super-Eddington rate via radiatively inefficient slim accretion discs. We use an improved version of the cosmological, data-constrained semi-analytic model GAMETE/QSODUST, where we follow the evolution of nuclear BHs and gas cooling, disc and bulge formation of their host galaxies. Adopting SDSS J1148+5251 (J1148) at z = 6.4 as a prototype of luminous z ≳ 6 quasars, we find that ∼80 per cent of its SMBH mass is grown by super-Eddington accretion, which can be sustained down to z ∼ 10 in dense, gas-rich environments. The average BH mass at z ∼ 20 is M<SUB>BH</SUB> ≳ 10<SUP>4</SUP> M<SUB>☉</SUB>, comparable to that of direct collapse BHs. At z = 6.4 the AGN-driven mass outflow rate is consistent with the observations and the BH-to-bulge mass ratio is compatible with the local scaling relation. However, the stellar mass in the central 2.5 kpc is closer to the value inferred from CO observations. Finally, ∼20 per cent of J1148 progenitors at z = 7.1 have BH luminosities and masses comparable to ULAS J1120+0641, suggesting that this quasar may be one of the progenitors of J1148. | URI: | http://hdl.handle.net/20.500.12386/26189 | URL: | http://arxiv.org/abs/1603.00475v1 https://academic.oup.com/mnras/article/458/3/3047/2589331 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw505 | Bibcode ADS: | 2016MNRAS.458.3047P | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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Pezzulli16.pdf | Pdf editoriale | 2.91 MB | Adobe PDF | View/Open |
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