The Merging History of Binary Supermassive Black Holes

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmology: Theory, Black Holes, Galaxies: Evolution, Quasars: General

Scientific paper

We present a model for the assembly of Supermassive Black Holes (SMBHs) at the center of galaxies following their hierarchical build-up, from early times, tracking their merging and accretion histories. We assumed that the seeds of the local SMBHs are intermediate mass BHs, mseed~ 150 msun, endproduct of the first stars in (mini)halos collapsing at z ~ 20 from high-sigma density fluctuations. As these pregalactic holes become incorporated through a series of mergers into larger and larger halos, they sink to the center owing to dynamical friction, accrete a fraction of the gas in the merger remnant to become supermassive, form a binary system, and eventually coalesce.

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