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
	Zhang Q(张强); Xiong SL(熊少林); Song LM(宋黎明); Zhang, Q; Xiong, SL; Song, LM
	2018
发表期刊	ASTROPHYSICAL JOURNAL (IF:5.533[JCR-2016],5.342[5-Year])
ISSN	0004-637X
EISSN	1538-4357
卷号	857 期号:2 页码:140
文章类型	Article
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.
关键词	acceleration of particles gamma-ray burst: individual (GRB 060614, GRB 060908) radiation mechanisms: non-thermal
DOI	10.3847/1538-4357/aab897
关键词[WOS]	GAMMA-RAY BURST ; RELATIVISTIC COLLISIONLESS SHOCKS ; SWIFT XRT DATA ; LIGHT CURVES ; X-RAY ; PARTICLE-ACCELERATION ; ULTRARELATIVISTIC SHOCKS ; PROMPT EFFICIENCIES ; MILLISECOND PULSARS ; MAGNETIC-FIELDS
收录类别	SCI
语种	英语
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
WOS记录号	WOS:000430968800007
ADS Bibcode	2018ApJ...857..140Z
AXRIV号	1801
INSPIRE ID	1650438
引用统计	正在获取... 被引频次：1 [ADS]
文献类型	期刊论文
条目标识符	https://ir.ihep.ac.cn/handle/311005/285855
专题	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
第一作者单位	中国科学院高能物理研究所
通讯作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Zhang Q,Xiong SL,Song LM,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	张强,熊少林,宋黎明,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	张强,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.