Photon Acceleration in Variable Ultrarelativistic Outflows and High-Energy Spectra of Gamma-Ray Bursts | Zendy

Andrei Gruzinov | Zendy; P. Mészáros | Zendy

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Photon Acceleration in Variable Ultrarelativistic Outflows and High-Energy Spectra of Gamma-Ray Bursts

Author(s) -

Andrei Gruzinov,

P. Mészáros

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/312829

Subject(s) - physics , photon , fermi gamma ray space telescope , lorentz factor , radiative transfer , cutoff , spectral line , compton scattering , gamma ray burst , atomic physics , nuclear physics , astrophysics , lorentz transformation , optics , astronomy , quantum mechanics

MeV seed photons produced in shocks in a variable ultra-relativistic outflowgain energy by the Fermi mechanism, because the photons Compton scatter offrelativistically colliding shells. The Fermi-modified high-energy photonspectrum has a non-universal slope and a universal cutoff. A significantincrease in the total radiative efficiency is possible. In some gamma raybursts, most of the power might be emitted at the high-energy cutoff for thismechanism, which would be close to 100 MeV for outflows with a mean bulkLorentz factor of 100.Comment: 8 pages, submitted to ApJ

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