Physics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1065..302x&link_type=abstract
2008 NANJING GAMMA-RAY BURST CONFERENCE. AIP Conference Proceedings, Volume 1065, pp. 302-305 (2008).
Physics
1
Infall, Accretion, And Accretion Disks, Accretion And Accretion Disks, Gamma-Ray Sources, Gamma-Ray Bursts
Scientific paper
We consider the influence of magnetic fields on the model of Neutrino-dominated Accretion Flows (NDAFs) for gamma-ray bursts (GRBs) via the assumption that the accretion rate of the disk is totally caused by the torque of Lorentz force (i.e. magnetic braking) and magnetic viscosity. It turns out that the over-pressure magnetic fields shall be formed inevitably under the assumption of the steady-state accretion. It strongly implys that the steady-state accretion may be quite unstable at such high accretion rate of several solar masses. It is favorable to interpret the observed X-ray flares in the early afterglow of the GRBs. We also find that it is quite inconvenient for neutrino mechanism of the NDAFs to power the X-ray flares, since the luminosity drops rapidly with the decrease of accretion rate after the magnetic fields were included.
Lei Wei-Hua
Wen Xiao-Qing
Xie Yangbo
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