Cosmological magnetic braking and the formation of high-redshift, super-massive black holes

Abstract

We study the effect of magnetic braking due to a primordial magnetic field in the context of the formation of massive ($\gtrsim 10^4{M}_{\odot }$) direct collapse black holes (DCBHs) at high redshifts. Under the assumption of axial symmetry, we analytically compute the effect of magnetic braking on the angular momentum of gas collapsing into the potential well of massive dark matter haloes ($\simeq 10^{7-9}{M}_{\odot }$) which are spun up by gravitational tidal torques. We find that a primordial magnetic field of strength $B_0\simeq 0.1$~nG (comoving) can remove the initial angular momentum gained by the in-falling gas due to tidal torques, thus significantly lowering the angular momentum barrier to the formation of DCBHs. These magnetic field strengths are consistent with the bounds on primordial fields from astrophysical and cosmological measurements and they are large enough to seed observed galactic magnetic fields.

arXiv comment12 pages, 6 figures, matches the published version in MNRAS

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