Zhang 2008 曲率效应可能产生非幂律谱

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Title:		Curvature Effect of a Non-Power-Law Spectrum and Spectral Evolution of GRB X-Ray Tails
Authors:		Zhang, Bin-Bin; Zhang, Bing; Liang, En-Wei; Wang, Xiang-Yu
Publication:		eprint arXiv:0808.3793
Publication Date:		08/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		12 pages, 4 figures, 1 table
Bibliographic Code:		2008arXiv0808.3793Z

Abstract

The apparent spectral evolution observed in the steep decay phase of many GRB early afterglows raises a great concern of the high-latitude ``curvature effect'' interpretation of this phase. However, previous curvature effect models only invoked a simple power law spectrum upon the cessation of the prompt internal emission. We investigate a model that invokes the ``curvature effect'' of a more general non-power-law spectrum and test this model with the Swift/XRT data of some GRBs. By comparing the simulated lightcurves/spectra with the observed ones, we show that one can reproduce both the observed lightcurve and the apparent spectral evolution of several GRBs using a model invoking a cut-off power-law spectrum. GRB 050814 is presented as an example. This suggests that at least for some GRBs, the fast spectral evolution in the steep-decay phase can be explained by the curvature effect invoking a non-power-law spectrum.

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