Curvature Effect of a Non-Power-Law Spectrum and Spectral Evolution of GRB X-Ray Tails

摘要：

The apparent spectral evolution observed in the steep decay phase of many GRB earlyX-ray afterglows raises agreat concern of the high-latitude“curvature effectinterpretation of this phase．However,previous curvature effect modelsonly invoked a simple power law spectrum upon the cessation of the prompt internal emission．We investigate the“curvatureeffect model of a more general non-power-law spectrum and and test this model with the Swift/XRT observations Bycomparing the simulated lightcurves/spectra with the observed ones,we show that one can reproduce both the observedlightcurve and the apparent spectral evolution of GRB 050814 using a model invoking a cut-off power-law spectrum．Thissuggests that at least for some GRBs,the fast spectral evolution in the steep-decay phase can be explained by the curvatureeffect of a non-power-law spectrum．

关键词： γ-ray soucces γ-ray bursts

作者: Bin—Bin Zhang Bing Zhang En-Wei Liang Xiang-Yu Wang

作者单位: Department of Physics and Astronomy,University of Nevada,Las vegas,NV 89154,USA Department of Physics,Guangxi Univemity,Nanning 530004,China Department of Astronomy,Nanjing University,Nanjing210093,China

会议类型: 国际会议

会议名称: 2008 NanJing Gamma-Ray Burst Conference(2008年伽马暴国际研讨会)

会议地点: 南京

会议语种:英文

页码: 169-172

在线出版日期: 2008-06-23（万方平台首次上网日期，不代表论文的发表时间）