Query : 2010A&A...516A..16L

2010A&A...516A..16L - Astronomy and Astrophysics, volume 516, A16-16 (2010/6-2)

Jet precession driven by neutrino-cooled disk for gamma-ray bursts.

LIU T., LIANG E.-W., GU W.-M., ZHAO X.-H., DAI Z.-G. and LU J.-F.

Abstract (from CDS):

A model of jet precession driven by a neutrino-cooled disk around a spinning black hole is presented to explain the temporal structure and spectral evolution of gamma-ray bursts (GRBs).The differential rotation of the outer part of a neutrino-dominated accretion disk may result in precession of the inner part of the disk and the central black hole, hence driving a precessed jet via neutrino annihilation around the inner part of the disk.Both analytic and numeric results for our model are presented. Our calculations show that a black-hole, accretion-disk system with the black hole mass M≃3.66M, accretion rate {dot}(M)≃0.54M/s, spin parameter a=0.9, and viscosity parameter α=0.01 may drive a precessed jet with period P=1s and luminosity L=1051erg/s, corresponding to the scenario for long GRBs. A precessed jet with P=0.1s and L=1050erg/s may be powered by a system with M ≃5.59M, {dot}(M)≃0.74M/s, a=0.1, and α=0.01, and is possibly responsible for the short GRBs. Both the temporal and spectral evolution in GRB pulse may be explained with our model.GRB central engines most likely power a precessed jet driven by a neutrino-cooled disk. The global GRB lightcurves thus could be modulated by the jet precession during the accretion timescale of the GRB central engine. Both the temporal and spectral evolution in GRB pulse may stem from a viewing effect of the jet precession.

Abstract Copyright:

Journal keyword(s): accretion: accretion disks - black hole physics - gamma ray burst: general

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 SN 2003lw SN* 08 02 30.1 -39 51 03       20.23   SNIc: 526 0
2 SS 433 HXB 19 11 49.5647697480 +04 58 57.827127648   16.3 13.0     A7Ib: 2052 4
3 SN 1998bw SN* 19 35 03.17 -52 50 46.1   14.09       SNIc 1764 2

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