GRB afterglows in the nonrelativistic phase

摘要：

When discussing the afterglows of gamma-ray bursts analytically,it is usually assumed that the external shockis always ultra-relativisitc,with the bulk Lorentz factor much larger than 1．However,we show that the deceleration of theexternal shock is actually very quick．The afterglow may typically enter the nonrelativistic phase in several days to teens ofdays,and may even enter the deep Newtonian phase in tens of days to several months．One thus should be careful in using thosefamiliar analytical expressions that are derived only under the ultra-relativistic assumption．To explain the observed afterglowsthat typically last for a few weeks to several months,we need to consider the dynamics and radiation in the nonrelativisiticphase．

关键词： Gamma-ray bursts Neutron stars Special relativity

作者: Y.E.Huang T.Lu

作者单位: Department of Astronomy,Nanjing Untverstty,NanJing 210093,China purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210008 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: 165-168

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）