The Luminosity - E_p Relation within Gamma--Ray Bursts and Implications for Fireball Models
摘要
Using a sample of 2408 time-resolved spectra for 91 BATSE gamma-ray bursts (GRBs) presented by Preece et al., we show that the relation between the isotropic-equivalent luminosity (L_iso) and the spectral peak energy (E_p) in the cosmological rest frame, L_iso \propto E_p^2, not only holds within these bursts, but also holds among these GRBs, assuming that the burst rate as a function of redshift is proportional to the star formation rate. The possible implications of this relation for the emission models of GRBs are discussed. We suggest that both the kinetic-energy-dominated internal shock model and the magnetic-dissipation-dominated external shock model can well interpret this relation. We constrain the parameters for these two models, and find that they are in a good agreement with the parameters from the fittings to the afterglow data (abridged).
关键词
引用
@article{arxiv.astro-ph/0403397,
title = {The Luminosity - E_p Relation within Gamma--Ray Bursts and Implications for Fireball Models},
author = {E. W. Liang and Z. G. Dai and X. F. Wu},
journal= {arXiv preprint arXiv:astro-ph/0403397},
year = {2009}
}
备注
3 pages plus 5 figures, emulateapj style, accepted for publication in ApJ Letters