Shallow Decay of X-ray Afterglows in Short GRBs:Energy Injection from a Millisecond Magnetar?  

作　　者：Yu Yu Yong-Feng Huang 

机构地区：[1]Shanghai Astronomical Observatories, Chinese Academy of Sciences, Shanghai 200030 [2]Department of Astronomy, Nanjing University, Nanjing 210093

出　　处：《Chinese Journal of Astronomy and Astrophysics》2007年第5期669-674,共6页中国天文和天体物理学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China.

摘　　要：With the successful launch of Swift satellite, more and more data of early X-ray afterglows from short gamma-ray bursts have been collected. Some interesting features such as unusual afterglow light curves and unexpected X-ray flares are revealed. Especially, in some cases, there is a flat segment in the X-ray afterglow light curve. Here we present a simplified model in which we believe that the flattening part is due to energy injection from the central engine. We assume that this energy injection arises from the magnetic dipole radiation of a millisecond pulsar formed after the merger of two neutron stars. We check this model with the short GRB 060313. Our numerical results suggest that energy injection from a millisecond magnetar could make part of the X-ray afterglow light curve flat.With the successful launch of Swift satellite, more and more data of early X-ray afterglows from short gamma-ray bursts have been collected. Some interesting features such as unusual afterglow light curves and unexpected X-ray flares are revealed. Especially, in some cases, there is a flat segment in the X-ray afterglow light curve. Here we present a simplified model in which we believe that the flattening part is due to energy injection from the central engine. We assume that this energy injection arises from the magnetic dipole radiation of a millisecond pulsar formed after the merger of two neutron stars. We check this model with the short GRB 060313. Our numerical results suggest that energy injection from a millisecond magnetar could make part of the X-ray afterglow light curve flat.

关 键 词：gamma rays bursts -- X-rays individual （GRB 060313） -- ISM -- stars neutron 

分 类 号：P14[天文地球—天体物理]