The Generation, Annihilation and the Re-radiation of the e± in the Internal Shocks

Details The Generation, Annihilation and the Re-radiation of the e± in the Internal Shocks The Generation, Annihilation and the Re-radiation of the e± in the Internal Shocks

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004acasn..45...25f&link_type=abstract

Acta Astronomica Sinica, vol. 45, no. 1, p. 25-32

Astronomy and Astrophysics

Astronomy

2

Gamma-Ray Burst, Shock Wave, Radiation Mechanisms: Non-Thermal

Scientific paper

In the standard internal shocks model for the Gamma-ray bursts, the pulse is generated by the collision of two ultra-relativistic shells with variable Lorentz factors and comparable masses. The radiation mechanisms are believed to be synchrotron and inverse Compoton (IC). In this case, the heated shells are optically thin for the usual ? rays . However, for ?-rays with energy high up to tens GeV, they are optically thick. As a result, these photons annihilate with the soft photons and e±pairs are created. Pilla & Loeb have simulated this process numerically (1998) and shown that a large amount of e±have been generated. Recently, Li, Dai & Lu (2003) have tried to explain why there are only three optical flashes by considering the rich e±pairs contained in the fireball. In this paper, we focus on describing the generation and annihilation quantities as functions of the arrival time. We found that the high energy component of synchrotron radiation contributes more at the early time of the pulse, but at the later time, it ends up due to the restriction of the maximum synchrotron radiation frequency. On the contrary, the IC component contributes more at later time. In total, the IC component contribution is more than the high energy component of the synchrotron radiation. The re-radiation of the e±pairs have been investigated, and we have found that there is no significant emission at least in the BATSE energy band due to the low Lorentz factor of the generated e±pairs. However, the secondary IC process may play some role on the observed emission.

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