Yu 2010 新诞生磁星解释X射线余辉

主要内容:
强行假设磁星释放的一部分能量产生X射线余辉，可以拟合一些变平和晚期的光变。

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Title:		The Role of Newly Born Magnetars in Gamma-ray Burst X-ray Afterglow Emission: Energy Injection and Internal Emission
Authors:		Yu, Yun-Wei; Cheng, K. S.; Cao, Xiao-Feng
Affiliation:		AA(Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China ; Institute of Astrophysics, Huazhong Normal University, Wuhan 430079, China; yuyw@hku.hk ), AB(Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China hrspksc@hkucc.hku.hk), AC(Institute of Astrophysics, Huazhong Normal University, Wuhan 430079, China)
Publication:		The Astrophysical Journal, Volume 715, Issue 1, pp. 477-484 (2010). (ApJ Homepage)
Publication Date:		05/2010
Origin:		IOP
ApJ Keywords:		gamma-ray burst: general, stars: neutron
DOI:		10.1088/0004-637X/715/1/477
Bibliographic Code:		2010ApJ...715..477Y

Abstract

Swift observations suggest that the central compact objects of some gamma-ray bursts (GRBs) could be newly born millisecond magnetars. Therefore, considering the spin evolution of the magnetars against r-mode instability, we investigate the role of magnetars in GRB X-ray afterglow emission. Besides modifying the conventional energy injection model, we pay particular attention to the internal X-ray afterglow emission, whose luminosity is assumed to track the magnetic dipole luminosity of the magnetars with a certain fraction. Following a comparison between the model and some selected observational samples, we suggest that some so-called canonical X-ray afterglows including the shallow decay, normal decay, and steeper-than-normal decay phases could be internally produced by the magnetars (possibly through some internal dissipations of the magnetar winds), while the (energized) external shocks are associated with another type of X-ray afterglows. If this is true, then from those internal X-ray afterglows we can further determine the magnetic field strengths and the initial spin periods of the corresponding magnetars.

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