Re-born fireballs in Gamma-Ray Bursts

Details Re-born fireballs in Gamma-Ray Bursts Re-born fireballs in Gamma-Ray Bursts

2007-09-12

arxiv.org/abs/0709.1945v1

Astronomy and Astrophysics

Astrophysics

5 pages, 3 Figures, accepted for publication in MNRAS (Letters)

Scientific paper

10.1111/j.1745-3933.2007.00392.x

We consider the interaction between a relativistic fireball and material assumed to be still located just outside the progenitor star. Only a small fraction of the expected mass is sufficient to efficiently decelerate the fireball, leading to dissipation of most of its kinetic energy. Since the scattering optical depths are still large at distances comparable to the progenitor radius, the dissipated energy is trapped in the system, accelerating it to relativistic velocities. The process resembles the birth of another fireball at radii R~1e11 cm, not far from the transparency radius, and with a starting bulk Lorentz factors Gamma_c~10. As seen in the observer frame, this "re--generated" fireball appears collimated within an angle theta_j=1/Gamma_c. If the central engine works intermittently, the funnel can, at least partially, refill and the process can repeat itself. We discuss how this idea can help solving some open issues of the more conventional internal shock scenario for interpreting the Gamma-Ray Burst properties.

Affiliated with

Also associated with

No associations

Rating

Re-born fireballs in Gamma-Ray Bursts 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 Re-born fireballs in Gamma-Ray Bursts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Re-born fireballs in Gamma-Ray Bursts will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-214208