X-ray plateaus followed by sharp drops in GRBs 060413, 060522, 060607A and 080330: Further evidences for central engine afterglow from gamma-ray bursts

作     者：Xiao-Hui Zhang 

作者机构：Department of Physics Yunnan University Kunming 650091 China 

出 版 物：《Chinese Journal of Astronomy and Astrophysics》 (中国天文和天体物理学报（英文版）)

年 卷 期：2009年第9卷第2期

页      面：213-219页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 070401[理学-天体物理] 0706[理学-大气科学] 0704[理学-天文学] 

主　　题：gamma-rays bursts -- ISM jets and outflows -- radiation mechanisms non-thermal 

摘      要：The X-ray afterglows of GRBs 060413, 060522, 060607A and 080330 are characterized by a plateau followed by a very sharp drop. The plateau could be explained within the framework of the external forward shock model but the sharp drop can not. We interpret the plateau as the afterglows of magnetized central engines, plausibly magnetars. In this model, the X-ray afterglows are powered by the internal magnetic energy dissipation and the sudden drop is caused by the collapse of the magnetar. Accordingly, the X-ray plateau photons should have a high linear polarization, which can be tested by future X-ray polarimetry.