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IMPRINTS OF ELECTRON-POSITRON WINDS ON THE MULTIWAVELENGTH AFTERGLOWS OF GAMMA-RAY BURSTS
Geng, J. J.; Wu, X. F.; Huang, Y. F.; Li, L.; Dai, Z. G.
2016
发表期刊ASTROPHYSICAL JOURNAL
卷号825期号:2页码:107
摘要Optical rebrightenings in the afterglows of some gamma-ray bursts (GRBs) are unexpected within the framework of the simple external shock model. While it has been suggested that the central engines of some GRBs are newly born magnetars, we aim to relate the behaviors of magnetars to the optical rebrightenings. A newly born magnetar will lose its rotational energy in the form of Poynting-flux, which may be converted into a wind of electron-positron pairs through some magnetic dissipation processes. As proposed by Dai, this wind will catch up with the GRB outflow and a long-lasting reverse shock (RS) would form. By applying this scenario to GRB afterglows, we find that the RS propagating back into the electron-positron wind can lead to an observable optical rebrightening and a simultaneous X-ray plateau (or X-ray shallow decay). In our study, we select four GRBs (i.e., GRB 080413B, GRB 090426, GRB 091029, and GRB 100814A), of which the optical afterglows are well observed and show clear rebrightenings. We find that they can be well interpreted. In our scenario, the spin-down timescale of the magnetar should be slightly smaller than the peak time of the rebrightening, which can provide a clue to the characteristics of the magnetar.
DOI10.3847/0004-637X/825/2/107
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文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/16856
专题南极天文中心
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Geng, J. J.,Wu, X. F.,Huang, Y. F.,et al. IMPRINTS OF ELECTRON-POSITRON WINDS ON THE MULTIWAVELENGTH AFTERGLOWS OF GAMMA-RAY BURSTS[J]. ASTROPHYSICAL JOURNAL,2016,825(2):107.
APA Geng, J. J.,Wu, X. F.,Huang, Y. F.,Li, L.,&Dai, Z. G..(2016).IMPRINTS OF ELECTRON-POSITRON WINDS ON THE MULTIWAVELENGTH AFTERGLOWS OF GAMMA-RAY BURSTS.ASTROPHYSICAL JOURNAL,825(2),107.
MLA Geng, J. J.,et al."IMPRINTS OF ELECTRON-POSITRON WINDS ON THE MULTIWAVELENGTH AFTERGLOWS OF GAMMA-RAY BURSTS".ASTROPHYSICAL JOURNAL 825.2(2016):107.
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