Gamma-ray bursts from magnetized collisionally-heated jets

Abstract

Jets producing gamma-ray bursts (GRBs) are likely to carry a neutron component that drifts with respect to the proton component. The neutron-proton collisions strongly heat the jet and generate electron-positron pairs. We investigate radiation produced by this heating using a new numerical code. Our results confirm the recent claim that collisional heating generates the observed Band-type spectrum of GRBs. We extend the model to study the effects of magnetic fields on the emitted spectrum. We find that the spectrum peak remains near 1 MeV for the entire range of the magnetization parameter $0<{\epsilon }_B<2$ that is explored in our simulations. The low-energy part of the spectrum softens with increasing ${\epsilon }_B$, and a visible soft excess appears in the keV band. The high-energy part of the spectrum extends well above the GeV range and can contribute to the prompt emission observed by Fermi/LAT. Overall, the radiation spectrum created by the collisional mechanism appears to agree with observations, with no fine-tuning of parameters.

13 pages, 6 figures, accepted to ApJ

References in corpus (8)

• Particle Acceleration in Relativistic Magnetized Collisionless Electron-Ion Shocks
• A Comprehensive Analysis of Fermi Gamma-Ray Burst Data. I. Spectral Components and Their Possible Physical Origins of LAT/GBM GRBs
• Reconciling observed GRB prompt spectra with synchrotron radiation ?
• Prompt emission spectra from the photosphere of a GRB
• On the origin of spectral states in accreting black holes
• A self-consistent hybrid Comptonization model for broad-band spectra of accreting supermassive black holes
• Hyper-accreting black holes
• Neutron-rich gamma-ray burst flows: dynamics and particle creation in neutron - proton collisions

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