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SUMMARY:Gamma ray bursts central machine as magnetically driven collapsar 
 model. - Maxim Barkov (University of Leeds)
DTSTART:20090223T160000Z
DTEND:20090223T170000Z
UID:TALK15336@talks.cam.ac.uk
CONTACT:Dr Lara Silvers
DESCRIPTION:In this work we describe the results of our numerical study on
  the possibility of magnetic origin of relativistic jets of long duration 
 gamma ray bursters within the collapsar scenario. We track the collapse of
  massive rotating stars onto a rotating central black hole using axisymmet
 ric general relativistic magnetohydrodynamic code that utilizes a realisti
 c equation of state of stellar matter\, takes into account the cooling ass
 ociated with emission of neutrinos\, and the energy losses due to dissocia
 tion of nuclei. The neutrino heating is not included. We describe the solu
 tions for several models where the progenitor star has magnetic field from
  B = 3 x 10^10 G to B= 3 x 10^9 G. The some solution exhibits strong explo
 sion driven by the Poynting-dominated jets whose power exceeds up to 12x10
 ^51\,erg/s. The jets originate mainly from the black hole and they are pow
 ered via the Blandford-Znajek mechanism.\n\n\n
LOCATION:MR14\, DAMTP\, Pav. F
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