Data di Pubblicazione:
2008
Citazione:
Formation and evolution of massive black hole seeds at high redshift / G. Lodato. - In: MEMORIE DELLA SOCIETÀ ASTRONOMICA ITALIANA. - ISSN 0037-8720. - 79:4(2008), pp. 1322-1325. ((Intervento presentato al convegno The central kiloparsec : active galactic nuclei and their hosts tenutosi a Ierapetra, Creta nel 2008.
Abstract:
I describe a simple analytical model to predict the amount of baryonic matter
available in the center of dark matter halos at high redshift, to fuel the early formation and
growth of the seeds of supermassive black holes. In this model black hole seed formation
occurs in mini-halos with Tvir~104K before the Universe was significantly enriched by
metals. If H2 formation is inhibited, we find that such halos would naturally form central
mass concentrations of the order of 105M that we associate with the seed of supermassive
black holes. Our model produces low-redshift black hole densities in good agreement with
Soltan-type arguments, and predicts a flattening of the black hole density at redshift larger
than z~6. We also predict a relative dearth of SMBH in dwarf galaxies at z = 0.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
G. Lodato
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