The spectral flattening of the low-energy component in gamma-ray bursts

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 宇宙伽马暴、中子星及相关物理研究团组

	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.