Modeling the Multiband Afterglows of GRB 060614 and GRB 060908: Further Evidence for a Double Power-law Hard Electron Energy Spectrum

doi:10.3847/1538-4357/aab897

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	Modeling the Multiband Afterglows of GRB 060614 and GRB 060908: Further Evidence for a Double Power-law Hard Electron Energy Spectrum
	Song LM(宋黎明); Zhang Q(张强); Xiong SL(熊少林); Zhang, Q; Xiong, SL; Song, LM
刊名	ASTROPHYSICAL JOURNAL
	2018
卷号	857 期号:2 页码:140
关键词	acceleration of particles gamma-ray burst: individual (GRB 060614, GRB 060908) radiation mechanisms: non-thermal
ISSN号	0004-637X
DOI	10.3847/1538-4357/aab897
文献子类	Article
英文摘要	Electrons accelerated in relativistic collisionless shocks are usually assumed to follow a power-law energy distribution with an index of p. Observationally, although most gamma-ray bursts (GRBs) have afterglows that are consistent with p > 2, there are still a few GRBs suggestive of a hard (p < 2) electron energy spectrum. Our previous work showed that GRB 091127 gave strong evidence for a double power-law hard electron energy (DPLH) spectrum with 1 < p(1) < 2, p(2) > 2 and an "injection break" assumed as gamma(b) proportional to gamma(q) in the highly relativistic regime, where gamma is the bulk Lorentz factor of the jet. In this paper, we show that GRB. 060614 and GRB. 060908 provide further evidence for such a DPLH spectrum. We interpret the multiband afterglow of GRB. 060614 with the DPLH model in a homogeneous interstellar medium by taking into account a continuous energy injection process, while, for GRB. 060908, a wind-like circumburst density profile is used. The two bursts, along with GRB 091127, suggest a similar behavior in the evolution of the injection break, with q similar to 0.5. Whether this represents a universal law of the injection break remains uncertain and more afterglow observations such as these are needed to test this conjecture.
电子版国际标准刊号	1538-4357
WOS关键词	GAMMA-RAY BURST ; RELATIVISTIC COLLISIONLESS SHOCKS ; SWIFT XRT DATA ; LIGHT CURVES ; X-RAY ; PARTICLE-ACCELERATION ; ULTRARELATIVISTIC SHOCKS ; PROMPT EFFICIENCIES ; MILLISECOND PULSARS ; MAGNETIC-FIELDS
WOS研究方向	Astronomy & Astrophysics
语种	英语
WOS记录号	WOS:000430968800007
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285855]
专题	高能物理研究所_粒子天体物理中心中国科学院高能物理研究所_中国散裂中子源
通讯作者	Zhang Q(张强)
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Song LM,Zhang Q,Xiong SL,et al. Modeling the Multiband Afterglows of GRB 060614 and GRB 060908: Further Evidence for a Double Power-law Hard Electron Energy Spectrum[J]. ASTROPHYSICAL JOURNAL,2018,857(2):140.
APA	宋黎明,张强,熊少林,Zhang, Q,Xiong, SL,&Song, LM.(2018).Modeling the Multiband Afterglows of GRB 060614 and GRB 060908: Further Evidence for a Double Power-law Hard Electron Energy Spectrum.ASTROPHYSICAL JOURNAL,857(2),140.
MLA	宋黎明,et al."Modeling the Multiband Afterglows of GRB 060614 and GRB 060908: Further Evidence for a Double Power-law Hard Electron Energy Spectrum".ASTROPHYSICAL JOURNAL 857.2(2018):140.