Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-11-02
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
12 pages, 8 figures
Scientific paper
We investigate the formation and properties of galaxies hosting z~6 quasars, in the gigaparsec scale cosmological hydrodynamical simulation: MassiveBlack, which includes a self-consistent model for star formation, black hole accretion and associated feedback. We show that the MassiveBlack reproduces current estimates of the galaxy stellar mass function z=5, 6. We find that quasar hosts in the simulation are compact gas rich systems with high star formations rates of SFR ~ 100-1000 Msun/yr consistent with observed properties of Sloan quasar hosts in the redshift range 5.5 < z < 6.5. We show that the star-forming gas in these galaxies predominantly originates from high density cold streams which are able to penetrate the halo and grow the galaxy at the center. MassiveBlack predicts a deviation from the local Mbh-sigma and Mbh-Mstar relation implying that black holes are relatively more massive for a given stellar host at these redshifts.
Croft Rupert A. C.
DeGraf Colin
Di Matteo Tiziana
Feng Yu
Khandai Nishikanta
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