Magnetic braking during direct collapse black hole formation
arXiv:2307.02256 · doi:10.3847/2041-8213/ace34f
Abstract
Magnetic fields are expected to be efficiently amplified during the formation of the first massive black holes via the small-scale dynamo and in the presence of strong accretion shocks occurring during gravitational collapse. Here, we analyze high-resolution cosmological magneto-hydrodynamical simulations of gravitational collapse in atomic cooling halos, exploring the dynamical role of magnetic fields, particularly concerning the effect of magnetic braking and angular momentum transport. We find that after the initial amplification, magnetic fields contribute to the transport of angular momentum and reduce it compared to pure hydrodynamical simulations. However, the magnetic and Reynolds torques do not fully compensate for the inward advection of angular momentum, which still accumulates over timescales of ~Myr. A Jeans analysis further shows that magnetic pressure strongly contributes to suppressing fragmentation on scales of ~pc. Overall, the presence of magnetic fields thus aids in the transport of angular momentum and favors the formation of massive objects.
arXiv commentAccepted for Publication in ApJL, comments are welcome
References in corpus (43)
- Planck 2015 results. XIII. Cosmological parameters
- Astrophysical magnetic fields and nonlinear dynamo theory
- Magnetic Fields in the Early Universe
- Evidence for strong extragalactic magnetic fields from Fermi observations of TeV blazars
- A new Jeans resolution criterion for (M)HD simulations of self-gravitating gas: Application to magnetic field amplification by gravity-driven turbulence
- Formation of Primordial Supermassive Stars by Rapid Mass Accretion
- Primordial Magnetic Fields from Cosmological First Order Phase Transitions
- Black hole formation in the early universe
- Magnetism in the spiral galaxy NGC 6946: magnetic arms, depolarization rings, dynamo modes and helical fields
- The First Magnetic Fields
- Magnetic Fields Produced by Phase Transition Bubbles in the Electroweak Phase Transition
- The generation of strong magnetic fields during the formation of the first stars
- Magnetic field formation in the Milky Way-like disk galaxies of the Auriga project
- Magnetic fields in cosmological simulations of disk galaxies
- Magnetic Fields in Population III Star Formation
- Gravitational collapse of magnetized clouds. I. Ideal MHD accretion flow
- Massive black hole factories: Supermassive and quasi-star formation in primordial halos
- The Small-Scale Dynamo and Non-Ideal MHD in Primordial Star Formation
- Magnetically self-regulated formation of early protoplanetary discs
- Magnetic Fields in Astrophysical Jets: From Launch to Termination
- Mean-Field Magnetohydrodynamics of Accretion Disks
- Black hole formation in primordial galaxies: chemical and radiative conditions
- The importance of magnetic fields for the initial mass function of the first stars
- The small scale dynamo and the amplification of magnetic fields in massive primordial haloes
- Primordial magnetic field limits from cosmological data
- The influence of magnetic fields on the thermodynamics of primordial star formation
- Protostellar Feedback and Final Mass of the Second-Generation Primordial Stars
- On the First Generation of Stars
- Magnetic fields during the formation of supermassive black holes
- Effects of simulated cosmological magnetic fields on the galaxy population
- Witnessing the birth of a supermassive protostar
- Gravitational Collapse of Rotating Supermassive Stars including Nuclear Burning Effects
- Maximally accreting supermassive stars: a fundamental limit imposed by hydrostatic equilibrium
- Magnetic fields in primordial accretion disks
- The Origin of Magnetic Fields in Galaxies
- Exponentially amplified magnetic field eliminates disk fragmentation around the Population III protostar
- Simulating the Magnetorotational Collapse of Supermassive Stars: Incorporating Gas Pressure Perturbations and Different Rotation Profiles
- Maximally Rotating Supermassive Stars at the Onset of Collapse: The Perturbative Effects of Gas Pressure, Magnetic Fields, Dark Matter and Dark Energy
- Intermittent fragmentation and statistical variations during gas collapse in magnetised atomic cooling haloes
- Role of magnetic fields in the formation of direct collapse black holes
- Supermassive Star Formation in Magnetized Atomic-Cooling Gas Clouds: Enhanced Accretion, Intermittent Fragmentation, and Continuous Mergers
- Cosmological magnetic braking and the formation of high-redshift, super-massive black holes
- The physics of the MHD disk-jet transition in binary systems: jetted spiral walls launched from disk spiral arms