Rotating BHs as Central Engines of Long GRBs: Faster is Better

Details Rotating BHs as Central Engines of Long GRBs: Faster is Better Rotating BHs as Central Engines of Long GRBs: Faster is Better

2010-10-24

arxiv.org/abs/1010.4964v3

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

8 pages, 7 figures, Publications of the Astronomical Society of Japan (PASJ), accepted (to be published on December 25th, 2011

Scientific paper

We performed simulations of collapsars with different Kerr parameters a=0, 0.5, 0.9, 0.95. It is shown that a more rapidly rotating black hole is driving a more energetic jet. No jet is seen for the case of Schwartzschild black hole case, while the total energy of the jet is as large as 10^50 erg for a rapidly rotating Kerr black hole case (a=0.95). In order to explain the high luminosity of a GRB, it is concluded that a rapidly rotating black hole is favored ('faster is better'). We also find in the case of a=0.95 that (i) the stagnation region is clearly found in the jet region, (ii) the ordered poloidal field lines are seen in the jet, (iii) the jet region is surrounded by a 'Wall-like' structure that has a higher pressure than the jet region and contains strong vertical magnetic fields, and (iv) the jet is initiated by outgoing Poynting flux from the outer horizon of the black hole (Blandford-Znajek effect). The bulk Lorentz factor of the jet is still of the order of unity. However, energy density of electro-magnetic fields dominates the one of rest-mass in the jet. It can be expected that a relativistic jet will be seen if we perform a simulation for a longer time scale (of the order of 10-100 sec).

Affiliated with

Also associated with

No associations

Rating

Rotating BHs as Central Engines of Long GRBs: Faster is Better does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Rotating BHs as Central Engines of Long GRBs: Faster is Better, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotating BHs as Central Engines of Long GRBs: Faster is Better will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-277449