Spectral lags explained as scattering from accelerated scatterers

David Eichler, Hadar Manis

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


A quantitative theory of spectral lags for γ-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 Eph, where η-0.4, as observed. The spectral lag time is naturally inversely proportional to luminosity, all else being equal, also as observed.

Original languageEnglish
Pages (from-to)L85-L88
JournalAstrophysical Journal
Issue number2 PART 2
StatePublished - 1 Jan 2008


  • Gamma rays: bursts


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