Baryon Loading of Gamma Ray Bursts by Pick-up Neutrons

Details Baryon Loading of Gamma Ray Bursts by Pick-up Neutrons Baryon Loading of Gamma Ray Bursts by Pick-up Neutrons

2003-02-27

arxiv.org/abs/astro-ph/0302569v2

Astrophys.J. 594 (2003) L19-L22

Astronomy and Astrophysics

Astrophysics

12 pages, substantial changes from previous version

Scientific paper

10.1086/378487

It is proposed that the baryons in gamma ray burst (GRB) fireballs originate as "pick-up" neutrons that leak in sideways from surrounding baryonic matter and convert to protons in a collision avalanche. The asymptotic Lorentz factor is estimated, and, in the absence of collimation, is shown to be angle dependent. Reasonable agreement is obtained with existing limits on the GRB baryonic component. The charged decay and collision products of the neutrons become ultrarelativistic immediately, and a UHE neutrino burst is produced with an efficiency that can exceed 0.5. Other signatures may include lithium, beryllium and/or boron lines in the supernova remnants associated with GRB's and high polarization of the gamma rays.

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