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Title: Supermassive black hole formation at high redshifts through a primordial magnetic field
Authors: Sethi, S.K.
Haiman, Zoltan
Pandey, Kanhaiya L.
Issue Date: 31-Aug-2010
Publisher: IOP Publishing Ltd.
Citation: Astronomical Journal, 2010, Vol. 721, p615
Abstract: It has been proposed that primordial gas in early dark matter halos, with virial temperatures T vir gsim 104 K, can avoid fragmentation and undergo rapid collapse, possibly resulting in a supermassive black hole. This requires the gas to avoid cooling and to remain at temperatures near T ~ 104 K. We show that this condition can be satisfied in the presence of a sufficiently strong primordial magnetic field, which heats the collapsing gas via ambipolar diffusion. If the field has a strength above midB mid gsim3.6 (comoving) nG, the collapsing gas is kept warm (T ~ 104 K) until it reaches the critical density n crit ≈ 103 cm-3 at which the rotovibrational states of H2 approach local thermodynamic equilibrium. H2 cooling then remains inefficient and the gas temperature stays near ~104 K, even as it continues to collapse at higher densities. The critical magnetic field strength required to permanently suppress H2 cooling is somewhat higher than the upper limit of ~2 nG from the cosmic microwave background. However, it can be realized in the rare gsim(2-3)σ regions of the spatially fluctuating B field; these regions contain a sufficient number of halos to account for z ≈ 6 quasar black holes.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 0004-637X
1538-4357 (Online)
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Copyright: 2010 IOP Publishing Limited
Appears in Collections:Research Papers (A&A)

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