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Gamma-ray bursts: the isotropic-equivalent-energy function and the cosmic formation rate
Wu, Shi-Wei1,2; Xu, Dong3; Zhang, Fu-Wen1,2,4; Wei, Da-Ming1,2
2012-07-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume423Issue:3Pages:2627-2632
AbstractGamma-ray bursts (GRBs) are brief but intense emissions of soft gamma-rays, mostly lasting from a few to a few thousand seconds. For these types of high-energy transients, the isotropic-equivalent-energy (Eiso) function may be more scientifically meaningful than the GRB isotropic-equivalent-luminosity (Liso) function, as the traditional luminosity function refers to steady emission much longer than a few thousand seconds. In this work we construct, for the first time, the isotropic-equivalent-energy function for a sample of 95 bursts with measured redshifts (z), and find an excess of high-z GRBs. Assuming that the excess is caused by a GRB luminosity function evolution in a power-law form, we find a cosmic evolution of , which is comparable to that between Liso and z, namely (both 1s). The evolution-removed isotropic-equivalent-energy function can be reasonably fitted by a broken power law, in which the dim and bright segments are and , respectively (1s). The cosmic GRB formation rate increases quickly in the region of , remains approximately constant for , and finally decreases with a power index of -3.80 +/- 2.16 for z?4, in good agreement with the cosmic star formation rate observed to date.
KeywordStars: Formation Gamma-ray Burst: General
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1111/j.1365-2966.2012.21068.x
WOS KeywordSTAR-FORMATION HISTORY ; LUMINOSITY FUNCTION ; HIGH-REDSHIFT ; PEAK LUMINOSITY ; UNIVERSE ; EVOLUTION ; DISTRIBUTIONS ; POPULATION ; CONNECTION ; STATISTICS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000305470100049
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8090
Collection宇宙伽马暴、中子星及相关物理研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China
3.Weizmann Inst Sci, Benoziyo Ctr Astrophys, IL-76100 Rehovot, Israel
4.Guilin Univ Technol, Coll Sci, Guilin 541004, Peoples R China
Recommended Citation
GB/T 7714
Wu, Shi-Wei,Xu, Dong,Zhang, Fu-Wen,et al. Gamma-ray bursts: the isotropic-equivalent-energy function and the cosmic formation rate[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,423(3):2627-2632.
APA Wu, Shi-Wei,Xu, Dong,Zhang, Fu-Wen,&Wei, Da-Ming.(2012).Gamma-ray bursts: the isotropic-equivalent-energy function and the cosmic formation rate.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,423(3),2627-2632.
MLA Wu, Shi-Wei,et al."Gamma-ray bursts: the isotropic-equivalent-energy function and the cosmic formation rate".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 423.3(2012):2627-2632.
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