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Query : 2012MNRAS.422..261B |
2012MNRAS.422..261B - Mon. Not. R. Astron. Soc., 422, 261-281 (2012/May-1)
The Hall effect in star formation.
BRAIDING C.R. and WARDLE M.
Abstract (from CDS):
The solutions show that the size and sign of the Hall parameter can change the size of the protostellar disc by up to an order of magnitude and the protostellar accretion rate by 50 per cent when the ratio of the Hall to ambipolar diffusivities is varied between -0.5 ≤ ηH/ηA ≤ 0.2. These changes depend upon the orientation of the magnetic field with respect to the axis of rotation and create a preferred handedness to the solutions that could be observed in protostellar cores using next-generation instruments such as ALMA.
Hall diffusion also determines the strength and position of the shocks that bound the pseudo and rotationally supported discs, and can introduce subshocks that further slow accretion on to the protostar. In cores that are not initially rotating (not examined here), Hall diffusion can even induce rotation, which could give rise to disc formation and resolve the magnetic braking catastrophe. The Hall effect clearly influences the dynamics of gravitational collapse and its role in controlling the magnetic braking and radial diffusion of the field merits further exploration in numerical simulations of star formation.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
Journal keyword(s): accretion, accretion discs - MHD - stars: formation
Simbad objects: 3
Number of rows : 3 |
N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | [JCC87] IRAS 4A | Y*O | 03 29 10.49 | +31 13 30.8 | ~ | 715 | 1 | |||||
2 | [JCC87] IRAS 4 | FIR | 03 29 10.9 | +31 13 26 | ~ | 478 | 0 | |||||
3 | [JCC87] IRAS 4B | Y*O | 03 29 12.058 | +31 13 02.05 | ~ | 600 | 0 |
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