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TESTING MODELS FOR THE SHALLOW DECAY PHASE OF GAMMA-RAY BURST AFTERGLOWS WITH POLARIZATION OBSERVATIONS
Lan, Mi-Xiang; Wu, Xue-Feng; Dai, Zi-Gao
2016
Source PublicationASTROPHYSICAL JOURNAL
Volume826Issue:2Pages:128
AbstractThe X-ray afterglows of almost one-half of gamma-ray bursts have been discovered by the Swift satellite to have a shallow decay phase of which the origin remains mysterious. Two main models have been proposed to explain this phase: relativistic wind bubbles (RWBs) and structured ejecta, which could originate from millisecond magnetars and rapidly rotating black holes, respectively. Based on these models, we investigate polarization evolution in the shallow decay phase of X-ray and optical afterglows. We find that in the RWB model, a significant bump of the polarization degree evolution curve appears during the shallow decay phase of both optical and X-ray afterglows, while the polarization position angle abruptly changes its direction by 90 degrees. In the structured ejecta model, however, the polarization degree does not evolve significantly during the shallow decay phase of afterglows whether the magnetic field configuration in the ejecta is random or globally large-scale. Therefore, we conclude that these two models for the shallow decay phase and relevant central engines would be testable with future polarization observations.
DOI10.3847/0004-637X/826/2/128
WOS IDIOP:0004-637X-826-2-128
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16853
Collection南极天文中心
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GB/T 7714
Lan, Mi-Xiang,Wu, Xue-Feng,Dai, Zi-Gao. TESTING MODELS FOR THE SHALLOW DECAY PHASE OF GAMMA-RAY BURST AFTERGLOWS WITH POLARIZATION OBSERVATIONS[J]. ASTROPHYSICAL JOURNAL,2016,826(2):128.
APA Lan, Mi-Xiang,Wu, Xue-Feng,&Dai, Zi-Gao.(2016).TESTING MODELS FOR THE SHALLOW DECAY PHASE OF GAMMA-RAY BURST AFTERGLOWS WITH POLARIZATION OBSERVATIONS.ASTROPHYSICAL JOURNAL,826(2),128.
MLA Lan, Mi-Xiang,et al."TESTING MODELS FOR THE SHALLOW DECAY PHASE OF GAMMA-RAY BURST AFTERGLOWS WITH POLARIZATION OBSERVATIONS".ASTROPHYSICAL JOURNAL 826.2(2016):128.
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