Slow Heating Model of Gamma-Ray Burst: Photon Spectrum and Delayed Emission

Abstract

We propose a new mechanism for the prompt emission of gamma-ray burst. In our model electrons are continuously accelerated in the post shock region via plasma turbulence. Using the Monte Carlo technique, we mimic the second-order Fermi acceleration due to plasma turbulence and obtain photon spectra. Since the acceleration balances with the synchrotron cooling, the observed low-energy spectral index is naturally explained. The resultant spectra can be consistent with observed spectra at least below $\sim 1$ MeV. The model also predicts delayed GeV-TeV emission due to inverse Compton and broad pulse profile of optical emission in some cases. Although nontrivial assumptions are required to reproduce MeV-GeV power-law spectra, the model implies the possibility to explain various kinds of luminosity correlations.

21 pages, 7 figures. Accepted for publication in The Astrophysical Journal

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• Low-energy Spectra of Gamma-ray Bursts from Cooling Electrons
• Spectral evolution in gamma-ray bursts: predictions of the internal shock model and comparison to observations
• Adiabatic non-resonant acceleration in magnetic turbulence and hard spectra of gamma-ray bursts
• Ultrahigh-Energy Cosmic Ray Production by Turbulence in Gamma-Ray Burst Jets and Cosmogenic Neutrinos
• Particle Energy Diffusion in Linear Magnetohydrodynamic Waves
• Spectral catalogue of bright gamma-ray bursts detected with the BeppoSAX/GRBM
• Inverse Compton cooling in Klein-Nishina regime and GRB prompt spectrum
• Gamma Ray Burst studies with THESEUS
• One Fits All: A Unified Synchrotron Model Explains GRBs with FRED-Shaped Pulses
• Herschel SPIRE discovery of far-infrared excess synchrotron emission from the west hot spot of the radio galaxy Pictor A
• Probing particle acceleration at trans-relativistic shocks with off-axis gamma-ray burst afterglows
• Electron Spectrum for the Prompt Emission of Gamma-ray Bursts in the Synchrotron Radiation Scenario