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High-energy afterglow emission from giant flares of soft gamma-ray repeaters: the case of the 2004 December 27 event from SGR 1806-20
Fan, YZ; Zhang, B; Wei, DM
2005-08-11
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume361Issue:3Pages:965-970
AbstractWe discuss the high-energy afterglow emission (including high-energy photons, neutrinos and cosmic rays) following the 2004 December 27 giant flare from the soft gamma-ray repeater (SGR) 1806-20. If the initial outflow is relativistic with a bulk Lorentz factor Gamma(0) similar to tens, the high-energy tail of the synchrotron emission from electrons in the forward shock region gives rise to a prominent sub-GeV emission, if the electron spectrum is hard enough and if the initial Lorentz factor is high enough. This signal could serve as a diagnosis of the initial Lorentz factor of the giant flare outflow. This component is potentially detectable by the Gamma-Ray Large Area Telescope (GLAST) if a similar giant flare occurs in the GLAST era. With the available 10-MeV data, we constrain that Gamma(0) < 50 if the electron distribution is a single power law. For a broken power-law distribution of electrons, a higher Gamma(0) is allowed. At energies higher than I GeV, the flux is lower because of a high-energy cut-off of the synchrotron emission component. The synchrotron self-Compton emission component and the inverse Compton scattering component off the photons in the giant flare oscillation tail are also considered, but they are found not significant given a moderate Gamma(0) (e.g. < 10). The forward shock also accelerates cosmic rays to the maximum energy 10(17) eV, and generates neutrinos with a typical energy 10(14) eV through photomeson interaction with the X-ray tail photons. However, they are too weak to be detectable.
KeywordAcceleration Of Particles Elementary Particles Hydrodynamics Stars : Neutron Stars : Winds Outflows Gamma-rays : Bursts
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1111/j.1365-2966.2005.09221.x
WOS KeywordBURST AFTERGLOWS ; MAGNETAR SGR-1806-20 ; MECHANISM
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000231418300021
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/4182
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, Natl Astron Observ, Beijing 100012, Peoples R China
3.Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA
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GB/T 7714
Fan, YZ,Zhang, B,Wei, DM. High-energy afterglow emission from giant flares of soft gamma-ray repeaters: the case of the 2004 December 27 event from SGR 1806-20[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2005,361(3):965-970.
APA Fan, YZ,Zhang, B,&Wei, DM.(2005).High-energy afterglow emission from giant flares of soft gamma-ray repeaters: the case of the 2004 December 27 event from SGR 1806-20.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,361(3),965-970.
MLA Fan, YZ,et al."High-energy afterglow emission from giant flares of soft gamma-ray repeaters: the case of the 2004 December 27 event from SGR 1806-20".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 361.3(2005):965-970.
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