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A REVISED LIMIT OF THE LORENTZ FACTORS OF GAMMA-RAY BURSTs WITH TWO EMITTING REGIONS
Zou, Yuan-Chuan1; Fan, Yi-Zhong2; Piran, Tsvi3
2011
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume726Issue:1Pages:L2(5pp)
AbstractFermi observations of GeV emission from gamma-ray bursts (GRBs) have suggested that the Lorentz factor of some GRBs is around a thousand or even higher. At the same time, the same Fermi observations have shown an extended GeV emission indicating that this higher energy emission might be a part of the afterglow and it does not come from the same region as the lower energy prompt emission. If this interpretation is correct then we may have to reconsider the opacity limits on the Lorentz factor which are based on a one-zone model. We describe here a two-zone model in which the GeV photons are emitted in a larger radius than theMeV photons and we calculate the optical depth for pair creation of a GeV photon passing the lower energy photons shell. We find that, as expected, the new two-zone limits on the Lorentz factor are significantly lower. When applied to Fermi bursts the corresponding limits are lower by a factor of five compared to the one-zone model. It is possible that both the MeV and GeV regions have relatively modest Lorentz factors (similar to 200-400). This two-zone limit is significantly softer than the one-zone limit.
KeywordGamma-ray Burst: General Radiation Mechanisms: Non-thermal Relativistic Processes
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/2041-8205/726/1/L2
WOS KeywordHIGH-ENERGY EMISSION ; FERMI OBSERVATIONS ; GRB 080916C ; SPECTRAL COMPONENT ; INTERNAL SHOCKS ; EXTERNAL SHOCK ; AFTERGLOW ; OUTFLOWS ; PROMPT ; MODEL
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000285296600002
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/4545
Collection宇宙伽马暴、中子星及相关物理研究团组
Affiliation1.Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
3.Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel
Recommended Citation
GB/T 7714
Zou, Yuan-Chuan,Fan, Yi-Zhong,Piran, Tsvi. A REVISED LIMIT OF THE LORENTZ FACTORS OF GAMMA-RAY BURSTs WITH TWO EMITTING REGIONS[J]. ASTROPHYSICAL JOURNAL LETTERS,2011,726(1):L2(5pp).
APA Zou, Yuan-Chuan,Fan, Yi-Zhong,&Piran, Tsvi.(2011).A REVISED LIMIT OF THE LORENTZ FACTORS OF GAMMA-RAY BURSTs WITH TWO EMITTING REGIONS.ASTROPHYSICAL JOURNAL LETTERS,726(1),L2(5pp).
MLA Zou, Yuan-Chuan,et al."A REVISED LIMIT OF THE LORENTZ FACTORS OF GAMMA-RAY BURSTs WITH TWO EMITTING REGIONS".ASTROPHYSICAL JOURNAL LETTERS 726.1(2011):L2(5pp).
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