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Cosmological magnetic braking and the formation of high-redshift, super-massive black holes | | Kanhaiya L. Pandey
; Shiv K. Sethi
; Bharat Ratra
; | | Date: |
5 Jan 2019 | | 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 $B_0simeq
0.1$~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. | | Source: | arXiv, 1901.1434 | | Services: | Forum | Review | PDF | Favorites | |
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