Predicting Spectral Parameters in the Backscattering-dominated Model for the Prompt Phase of GRBs

Mukesh K. Vyas, Asaf Pe'Er, David Eichler

Research output: Contribution to journalArticlepeer-review

Abstract

We present new results of the backscattering-dominated prompt emission model in which the photons generated through pair annihilation at the center of a gamma-ray burst (GRB) are backscattered through Compton scattering by an outflowing stellar cork. Using a Comptonized pair annihilation spectrum accompanied by bremsstrahlung radiation for seed photons, we show that the obtained spectra produce a low-energy photon index in the range α ∼ -1.95 to -1.1, steeper high-energy slopes β ∼ -3.5 to -2.4, and spectral peak energies approximately a few KeV to a few tens of MeV. These findings are consistent with the values covered in GRB prompt phase observations.

Original languageAmerican English
Article numberL12
JournalAstrophysical Journal Letters
Volume918
Issue number1
DOIs
StatePublished - 1 Sep 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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