Unstable GRB photospheres and electron-positron annihilation lines

Details Unstable GRB photospheres and electron-positron annihilation lines Unstable GRB photospheres and electron-positron annihilation lines

2007-08-09

arxiv.org/abs/0708.1249v1

Astrophys.J.670:L77-L80,2007

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures

Scientific paper

10.1086/524405

We propose an emission mechanism of prompt gamma-ray bursts (GRBs) that can reproduce the observed non-thermal spectra with high radiative efficiencies, >50%. Internal dissipation below a photosphere can create a radiation-dominated thermal fireball. If electron-positron pairs outnumber protons, radiative acceleration of pairs drives the two-stream instabilities between pairs and protons, leading to the ``proton sedimentation'' in the accelerating pair frame. Pairs are continuously shock heated by proton clumps, scattering the thermal photons into the broken power-law shape, with the non-thermal energy that is comparable to the proton kinetic energy, consistent with observations. Pair photospheres become unstable around the radius of the progenitor star where strong thermalization occurs, if parameters satisfy the observed spectral (Yonetoku) relation. Pair annihilation lines are predicted above continua, which could be verified by GLAST.

Affiliated with

Also associated with

No associations

Rating

Unstable GRB photospheres and electron-positron annihilation lines 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 Unstable GRB photospheres and electron-positron annihilation lines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Unstable GRB photospheres and electron-positron annihilation lines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-417282