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A Comprehensive Analysis of Fermi Gamma-Ray Burst Data. IV. Spectral Lag and its Relation to E-p Evolution
Lu, Rui-Jing1; Liang, Yun-Feng2; Lin, Da-Bin1; Lu, Jing1; Wang, Xiang-Gao1; Lu, Hou-Jun1; Liu, Hong-Bang1; Liang, En-Wei1; Zhang, Bing1,3
2018-10-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume865Issue:2Pages:14
Abstract

The spectral evolution and spectral lag behavior of 92 bright pulses from 84 gamma-ray bursts observed by the Fermi Gamma-ray Burst Monitor (GBM) telescope are studied. These pulses can be classified into hard-to-soft pulses (H2S; 64/92), H2S-dominated-tracking pulses (21/92), and other tracking pulses (7/92). We focus on the relationship between spectral evolution and spectral lags of H2S and H2S-dominated-tracking pulses. The main trend of spectral evolution (lag behavior) is estimated with log E-p alpha k(E) log(t + t(0)) ((tau) over cap alpha k((tau) over cap) log E), where E-p is the peak photon energy in the radiation spectrum, t + t(0) is the observer time relative to the beginning of pulse - t(0), and (tau) over cap is the spectral lag of photons with energy E with respect to the energy band 8-25 keV For H2S and H2S-dominated-tracking pulses, a weak correlation between k((tau) over cap)/W and k(E) is found, where W is the pulse width. We also study the spectral lag behavior with peak time t(pE) of pulses for 30 well-shaped pulses and estimate the main trend of the spectral lag behavior with log t(pE) alpha k(tp) log E. It is found that k(tp) is correlated with k(E). We perform simulations under a phenomenological model of spectral evolution, and find that these correlations are reproduced. We then conclude that spectral lags are closely related to spectral evolution within the pulse. The most natural explanation of these observations is that the emission is from the electrons in the same fluid unit at an emission site moving away from the central engine, as expected in the models invoking magnetic dissipation in a moderately high-sigma outflow.

Keywordgamma-ray burst: general methods: statistical
DOI10.3847/1538-4357/aada16
WOS KeywordLUMINOSITY RELATION ; PULSES ; CONNECTION ; EMISSION ; DURATION ; CATALOG ; PROMPT ; PHASES ; STARS ; GRBS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000446350500013
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21230
Collection中国科学院紫金山天文台
Corresponding AuthorLu, Rui-Jing
Affiliation1.Guangxi Univ, Dept Phys, Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
Recommended Citation
GB/T 7714
Lu, Rui-Jing,Liang, Yun-Feng,Lin, Da-Bin,et al. A Comprehensive Analysis of Fermi Gamma-Ray Burst Data. IV. Spectral Lag and its Relation to E-p Evolution[J]. ASTROPHYSICAL JOURNAL,2018,865(2):14.
APA Lu, Rui-Jing.,Liang, Yun-Feng.,Lin, Da-Bin.,Lu, Jing.,Wang, Xiang-Gao.,...&Zhang, Bing.(2018).A Comprehensive Analysis of Fermi Gamma-Ray Burst Data. IV. Spectral Lag and its Relation to E-p Evolution.ASTROPHYSICAL JOURNAL,865(2),14.
MLA Lu, Rui-Jing,et al."A Comprehensive Analysis of Fermi Gamma-Ray Burst Data. IV. Spectral Lag and its Relation to E-p Evolution".ASTROPHYSICAL JOURNAL 865.2(2018):14.
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