“Double-tracking” Characteristics of the Spectral Evolution of GRB 131231A: Synchrotron Origin?
Li,Liang1,2; Geng,Jin-Jun3,4; Meng,Yan-Zhi1,5; Wu,Xue-Feng1; Huang,Yong-Feng3,4; Wang,Yu2,6,7; Moradi,Rahim2,6; Uhm,Z. Lucas8,9; Zhang,Bing10
Source PublicationThe Astrophysical Journal
AbstractAbstract The characteristics of the spectral evolution of the prompt emission of gamma-ray bursts (GRBs), which are closely related to the radiation mechanism (synchrotron or photosphere), are still an unsolved subject. Here, by performing the detailed time-resolved spectral fitting of GRB 131231A, which has a very bright and well-defined single pulse, some interesting spectral evolution features have been found. (i) Both the low-energy spectral index α and the peak energy Ep exhibit the “flux-tracking” pattern (“double-tracking” characteristics). (ii) The parameter relations, i.e., F (the energy flux)-α, F–Ep, and Ep–α, along with the analogous Yonetoku Ep–Lγ,iso relation for the different time-resolved spectra, show strong monotonous (positive) correlations, both in the rising and the decaying phases. (iii) The values of α do not exceed the synchrotron limit (α?=??2/3) in all slices across the pulse, favoring the synchrotron origin. We argue that the one-zone synchrotron emission model with the emitter streaming away at a large distance from the central engine can explain all of these special spectral evolution characteristics.
Keywordgamma-ray burst: general radiation mechanisms: non-thermal
WOS IDIOP:0004-637X-884-2-ab40b9
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210034, People’s Republic of China;,
2.ICRANet, Piazza della Repubblica 10, I-65122 Pescara, Italy
3.School of Astronomy and Space Science, Nanjing University, Nanjing 210023, People’s Republic of China;
4.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210023, People’s Republic of China
5.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
6.Dip. di Fisica and ICRA, Sapienza Universit di Roma, Piazzale Aldo Moro 5, I-00185 Rome, Italy
7.INAF – Osservatorio Astronomico d’Abruzzo, Via M. Maggini snc, I-64100, Teramo, Italy;
8.Astrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;
9.Korea Astronomy and Space Science Institute, Daejeon 34055, Republic of Korea
10.Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154, USA
Recommended Citation
GB/T 7714
Li,Liang,Geng,Jin-Jun,Meng,Yan-Zhi,等. “Double-tracking” Characteristics of the Spectral Evolution of GRB 131231A: Synchrotron Origin?[J]. The Astrophysical Journal,2019,884(2).
APA Li,Liang.,Geng,Jin-Jun.,Meng,Yan-Zhi.,Wu,Xue-Feng.,Huang,Yong-Feng.,...&Zhang,Bing.(2019).“Double-tracking” Characteristics of the Spectral Evolution of GRB 131231A: Synchrotron Origin?.The Astrophysical Journal,884(2).
MLA Li,Liang,et al."“Double-tracking” Characteristics of the Spectral Evolution of GRB 131231A: Synchrotron Origin?".The Astrophysical Journal 884.2(2019).
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