The large-scale magnetic field advected in the corona of a thin accretion disk
arXiv:2101.11448 · doi:10.3847/1538-4357/abe125
Abstract
Large-scale magnetic field is believed to play a key role in launching and collimating jets/outflows. It was found that advection of external field by a geometrically thin disk is rather inefficient, while the external weak field may be dragged inwards by fast radially moving tenuous or/and hot gas above the thin disk. We investigate the field advection in a thin (cold) accretion disk covered with hot corona, in which turbulence is responsible for the angular momentum transfer of the gas in the disk and corona. The radial velocity of the gas in the corona is significantly higher than that in the thin disk. Our calculations show that the external magnetic flux is efficiently transported inwards by the corona, and the field line is strongly inclined towards the disk surface, which help launching outflows. The field configurations are consistent with those observed in the numerical simulations. The strength of the field is substantially enhanced in the inner region of the disk (usually several orders of magnitude higher than the external field strength), which is able to drive a fraction of gas in the corona into outflows. This mechanism may be useful in explaining the observational features in X-ray binaries and active galactic nuclei. Our results may help understanding the physics of the magneto-hydrodynamic (MHD) simulations.
Accepted for publication on ApJ
References in corpus (19)
- Heating Hot Atmospheres with Active Galactic Nuclei
- Wind from the black-hole accretion disk driving a molecular outflow in an active galaxy
- The magnetic nature of disk accretion onto black holes
- A Compton-thick Wind in the High Luminosity Quasar, PDS 456
- An accretion disc-corona model for X-ray spectra of active galactic nuclei
- Magnetically-Driven Accretion-Disk Winds and Ultra-Fast Outflows in PG1211+143
- Advection/Diffusion of Large-Scale B-Field in Accretion Disks
- Resolving the soft X-ray ultra fast outflow in PDS 456
- An Obscured, Seyfert-2-like State of the Stellar-mass Black Hole GRS 1915+105 Caused by Failed Disk Winds
- Analytical Solution of Magnetically Dominated Astrophysical Jets and Winds: Jet Launching, Acceleration, and Collimation
- Thermal stability of thin disk with magnetically driven winds
- Jet power extracted from ADAF and the applications to X-ray binaries and radio galaxy FR dichotomy
- Physical Conditions in Ultra Fast Outflows in AGN
- The large-scale magnetic field of a thin accretion disk with outflows
- The high efficiency jets magnetically accelerated from a thin disk in powerful lobe-dominated FRII radio galaxies
- Large-scale dynamics of winds originated from black hole accretion flows: (II) Magnetohydrodynamics
- The power of the jets accelerated by the coronal magnetic field
- Insight-HXMT observations of a possible fast transition from jet to wind dominated state during a huge flare of GRS~1915+105
- Growth of massive black holes at high-z via accretion predominantly driven by magnetic outflows