2003
DOI: 10.1086/379231
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Pair Loading in Gamma‐Ray Burst Fireballs and Prompt Emission from Pair‐rich Reverse Shocks

Abstract: Gamma-ray bursts (GRBs) are believed to originate from ultrarelativistic winds/fireballs to avoid the '' compactness problem.'' However, the most energetic photons in GRBs may still suffer from -absorption leading to e AE pair production in the winds/fireballs. We show here that in a wide range of model parameters, the resulting pairs may dominate those electrons associated with baryons. Later on, the pairs would be carried into a reverse shock so that a shocked pair-rich fireball may produce a strong flash at… Show more

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Cited by 26 publications
(35 citation statements)
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“…Indeed, the injection frequency is reduced greatly by even a modest number of pairs, however, we find that in the most frequent arrangement of frequencies, the peak of f ν is at ν ar , which is not affected by pairs much at all. Most of the difference between our calculations results from the treatment of RS strength; we have taken into account the mildly relativistic nature of the RS, where Li et al (2003) have approximated the RS as being highly relativistic. Another contributing factor to the difference in our results is the more careful and self‐consistent calculation of synchrotron cooling and self‐absorption frequencies that we have done here.…”
Section: Discussionmentioning
confidence: 99%
“…Indeed, the injection frequency is reduced greatly by even a modest number of pairs, however, we find that in the most frequent arrangement of frequencies, the peak of f ν is at ν ar , which is not affected by pairs much at all. Most of the difference between our calculations results from the treatment of RS strength; we have taken into account the mildly relativistic nature of the RS, where Li et al (2003) have approximated the RS as being highly relativistic. Another contributing factor to the difference in our results is the more careful and self‐consistent calculation of synchrotron cooling and self‐absorption frequencies that we have done here.…”
Section: Discussionmentioning
confidence: 99%
“…suggest that a dominant synchrotron-self-Compton process in the reverse shock region would suppress the synchrotron optical emission. Li et al (2003b) and MaMahon et al (2006) suggest a pair-rich reverse shock with weak optical emission.…”
Section: Optical Observationsmentioning
confidence: 99%
“…The annihilation time‐scale is long and most of generated pairs can not be annihilated locally. These pairs will be heated by the RS, too (Li et al 2003, and the references therein). Without doubt, the RS emission has been significantly softened.…”
Section: Discussionmentioning
confidence: 99%