Spectra and Light Curves of Gamma-Ray Burst Afterglows | Zendy

Re’em Sari | Zendy; Tsvi Piran | Zendy; Ramesh Narayan | Zendy

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Spectra and Light Curves of Gamma-Ray Burst Afterglows

Author(s) -

Re’em Sari,

Tsvi Piran,

Ramesh Narayan

Publication year - 1998

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 - 10.1086/311269

Subject(s) - physics , afterglow , light curve , gamma ray burst , astrophysics , synchrotron radiation , adiabatic process , power law , spectral index , radiative transfer , spectral line , synchrotron , computational physics , astronomy , optics , quantum mechanics , statistics , mathematics

The recently discovered GRB afterglow is believed to be described reasonablywell by synchrotron emission from a slowing down relativistic shell thatcollides with an external medium. To compare theoretical models with afterglowobservations we calculate here the broad band spectrum and corresponding lightcurve of synchrotron radiation from a power-law distribution of electrons in anexpanding relativistic shock. Both the spectrum and the light curve consist ofseveral power-law segments. The light curve is constructed under two limitingmodels for the hydrodynamical evolution of the shock: fully adiabatic and fullyradiative. We compare the results with observations of $\gamma$-ray burstafterglows.Comment: 8 page latex file including 2 figure

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