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The luminosity-E-p relation within gamma-ray bursts and the implications for fireball models
Liang EW(梁恩维)1,2,3; Dai, ZG1; Wu, XF1; Liang, EW (reprint author), Nanjing Univ, Dept Astron, 22 Hankou Lu, Nanjing 210093, Peoples R China.
Source PublicationASTROPHYSICAL JOURNAL
2004-05-01
Volume606Issue:1Pages:L29-L32
DOI10.1086/421047
Contribution Rank第3完成单位
Indexed BySCI
KeywordGamma Rays : Bursts Gamma Rays : Observations Methods : Statistical
AbstractUsing a sample of 2408 time-resolved spectra for 91 BATSE gamma-ray bursts (GRBs) presented by Preece et al., we show that the relation between the isotropic-equivalent luminosity (L-iso) and the peak energy (E'(p)) of the nuF(nu) spectrum in the cosmological rest frame, L-iso proportional to E'(2)(p), holds within these bursts and also holds among these GRBs, assuming that the burst rate as a function of redshift is proportional to the star formation rate. The possible implications of this relation for the fireball models are discussed by defining a parameter omega = (L-iso/10(52) erg s(-1))(0.5)/(E'(p)/200 keV). It is found that omega is narrowly clustered in 0.1-1. We constrain some parameters for both the internal shock and external shock models from the requirement of omega similar to 0.1-1, assuming that these model parameters are uncorrelated. The distributions of the parameters suggest that if the prompt gamma rays are produced from kinetic-energy-dominated internal shocks, they may be radiated from a region around R similar to 10(12)-10(13) cm (or Lorentz factor similar to 130 - 410) with a combined internal shock parameter zeta(i)similar to0.1-1 during the prompt gamma-ray phase, which is consistent with the standard internal shock model; if the prompt gamma rays of these GRBs are radiated from magnetic-dissipation-dominated external shocks, the narrow cluster of omega requires sigma similar to 1-470, Gamma similar to216-511, E similar to 10(51)-10(54) ergs, n similar to 0.5-470 cm(-3), and zeta(e)similar to0.36-3.6, where sigma is the ratio of the cold to hot luminosity components, Gamma is the bulk Lorentz factor of the fireball, E is the total energy release in the gamma-ray band, n is the medium number density, and zeta(e) is a combined external shock parameter; these values are also in a good agreement with the fittings to the afterglow data. These results indicate that both the kinetic-energy-dominated internal shock model and the magnetic-dissipation - dominated external shock model can well interpret the L-iso proportional to E'(2)(p) relation and the value of omega.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-637X
URL查看原文
Archive Date2004-08-11
WOS IDWOS:000220925900008
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordAFTERGLOWS ; SPECTRA
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6977
Collection星系研究组
Corresponding AuthorLiang, EW (reprint author), Nanjing Univ, Dept Astron, 22 Hankou Lu, Nanjing 210093, Peoples R China.
Affiliation1.Department of Astronomy, Nanjing University, 22 Hankou Lu, Nanjing 210093, China
2.Department of Physics, Guangxi University, Nanning 530004, China
3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Liang EW,Dai, ZG,Wu, XF,et al. The luminosity-E-p relation within gamma-ray bursts and the implications for fireball models[J]. ASTROPHYSICAL JOURNAL,2004,606(1):L29-L32.
APA Liang EW,Dai, ZG,Wu, XF,&Liang, EW .(2004).The luminosity-E-p relation within gamma-ray bursts and the implications for fireball models.ASTROPHYSICAL JOURNAL,606(1),L29-L32.
MLA Liang EW,et al."The luminosity-E-p relation within gamma-ray bursts and the implications for fireball models".ASTROPHYSICAL JOURNAL 606.1(2004):L29-L32.
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