Supermassive Black Holes and AGNs in Hierarchical Galaxy Formation

Details Supermassive Black Holes and AGNs in Hierarchical Galaxy Formation Supermassive Black Holes and AGNs in Hierarchical Galaxy Formation

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..373...64m&link_type=abstract

The Central Engine of Active Galactic Nuclei, ASP Conference Series, Vol. 373, proceedings of the conference held 16-21 October,

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We include the accretion of gas onto supermassive black holes (BHs) into a semi-analytic model of galaxy formation in the cosmological framework of hierarchical clustering. The feeding of BHs is triggered by the galaxy interactions, while the gas available for supply is computed self-consistently in the model. In such a cosmological framework the Eddington ratio λ for AGNs is predicted to follow a bimodal distribution at z≤ 2, with high-λ branch corresponding to bright AGNs (with luminosities L>1045 ergs s-1) and with a growing population in the low-λ branch contributed by faint AGNs (with luminosities L<1044 ergs s-1). At higher redshift the distribution is instead peaked at high values of λ=0.3-1.

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