Eichler 2008 Spectral Lags by scattering

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Title:		Spectral Lags Explained as Scattering from Accelerated Scatterers
Authors:		Eichler, David; Manis, Hadar
Publication:		eprint arXiv:0810.3006
Publication Date:		10/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		2 figures
Bibliographic Code:		2008arXiv0810.3006E

Abstract

A quantitative theory of spectral lags for $\gamma$-ray bursts (GRBs) is given. The underlying hypothesis is that GRB subpulses are photons that are scattered into our line of sight by local concentrations of baryons that are accelerated by radiation pressure. For primary spectra that are power laws with exponential cutoffs, the width of the pulse and its fast rise, slow decay asymmetry is found to increase with decreasing photon energy, and the width near the exponential cutoff scales approximately as $E_{ph}^{-\eta}$, with $\eta\sim 0.4$, as observed. The spectral lag time is naturally inversely proportional to luminosity, all else being equal, also as observed.

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