The spectral flattening of the low-energy component in gamma-ray bursts | |
Cheng, KS; Wei, DM | |
刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
1996-12-15 | |
卷号 | 283期号:4页码:L133-L137 |
关键词 | radiation mechanisms, nonthermal gamma-rays, bursts |
ISSN号 | 0035-8711 |
英文摘要 | Observations from BATSE show that the spectra of gamma-ray bursts are very wide, which cannot be described by a simple law. The distribution of the peak energy E(p) [defined as the maximum of the E(gamma)(2)N(E(gamma)) spectrum], and of the spectral indices below and above E(p), is wide. In particular, the slope below E(p) lies mainly between 0.5 and 1, which is inconsistent with the 4/3 predicted by the simple synchrotron radiation spectrum. Here we discuss the emission model for gamma-ray bursts based on the shock model proposed by Meszaros & Rees. We find that the synchrotron radiation of relativistic electrons accelerated by a strong shock, together with the finite lifetime of synchrotron radiation and the non-uniform magnetic field distribution, can explain the gamma-ray burst spectra, and the spectral index below the peak energy E(p) can be flattened by the non-uniform magnetic field distribution; this flattening is insensitive to the specific form of the magnetic field variance. Furthermore, the peak energy E(p) proportional to Gamma(4) is sensitively dependent on the bulk Lorentz factor. |
学科主题 | Astronomy & Astrophysics |
WOS标题词 | Science & Technology ; Physical Sciences |
类目[WOS] | Astronomy & Astrophysics |
研究领域[WOS] | Astronomy & Astrophysics |
关键词[WOS] | BLAST-WAVE MODELS ; FIREBALLS ; ORIGIN |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:A1996WA23500007 |
公开日期 | 2013-02-05 |
内容类型 | 期刊论文 |
源URL | [http://libir.pmo.ac.cn/handle/332002/8443] |
专题 | 紫金山天文台_宇宙伽马暴、中子星及相关物理研究团组 |
作者单位 | ACAD SINICA, PURPLE MT OBSERV, NANJING 210008, PEOPLES R CHINA |
推荐引用方式 GB/T 7714 | Cheng, KS,Wei, DM. The spectral flattening of the low-energy component in gamma-ray bursts[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,1996,283(4):L133-L137. |
APA | Cheng, KS,&Wei, DM.(1996).The spectral flattening of the low-energy component in gamma-ray bursts.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,283(4),L133-L137. |
MLA | Cheng, KS,et al."The spectral flattening of the low-energy component in gamma-ray bursts".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 283.4(1996):L133-L137. |
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