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

Journal Article · · Monthly Notices of the Royal Astronomical Society
ORCiD logo [1];  [2];  [3]
  1. Indian Institute of Astrophysics, II Block, Koramangala, Bangalore 560 034, India
  2. Raman Research Institute, Sadashivanagar, Bangalore 560080, India
  3. Department of Physics, Kansas State University, 116 Cardwell Hall, Manhattan, KS 66506, USA

Abstract We study the effect of magnetic braking due to a primordial magnetic field in the context of the formation of massive (≳104M⊙) 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 (≃107−9M⊙) which are spun up by gravitational tidal torques. We find that a primordial magnetic field of strength B0 ≃ 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.

Research Organization:
Kansas State Univ., Manhattan, KS (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC0019038
OSTI ID:
1507439
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 2 Vol. 486; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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