PMO OpenIR  > 宇宙伽马暴、中子星及相关物理研究团组
The very early afterglow powered by, ultra-relativistic mildly magnetized outflows
Fan, YZ; Wei, DM; Wang, CF
2004-09-01
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume424Issue:2Pages:477-484
AbstractIn the Poynting Flux-dominated outflow (the initial ratio of the electromagnetic energy flux to the particle energy flux sigma(0) much greater than 1) model for gamma-ray bursts, particularly the gamma-ray emission phase, nearly half of the internally dissipated magnetic energy is converted into the gamma-ray energy emission and the rest is converted into the kinetic energy of the outflow. Consequently, at the end of the gamma-ray burst, sigma decreases significantly (sigma similar to 1 or even smaller). We numerically investigate the very early reverse shock emission powered by such mildly magnetized outflows interacting with medium-uniform interstellar medium (ISM) or stellar wind (WIND). We show that for sigma similar to 0.05-1 and typical parameters of gamma-ray bursts, both the ISM-ejecta interaction and the WIND-ejecta interaction can power very strong optical emission (m(R) similar to 10-12th mag or even brighter). Similar to the very early afterglow powered by the non-magnetized ejecta interacting with the external medium, the main difference between the ISM-ejecta interaction case and the WIND-ejecta interaction case is that, before the reverse shock crosses the ejecta, the R-band emission flux increases rapidly for the former, but for the latter it increases only slightly.
KeywordGamma-rays : Bursts Magnetic Fields Magnetohydrodynamics (Mhd) Shock Waves Relativity
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1051/0004-6361:20041115
WOS KeywordGAMMA-RAY BURSTS ; REVERSE SHOCK EMISSION ; OPTICAL FLASH ; NONTHERMAL RADIATION ; GRB OUTFLOWS ; MODEL ; POLARIZATION ; PARAMETERS ; GRB-990123 ; FIREBALLS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000224300800015
Citation statistics
Cited Times:64[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/7747
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
Recommended Citation
GB/T 7714
Fan, YZ,Wei, DM,Wang, CF. The very early afterglow powered by, ultra-relativistic mildly magnetized outflows[J]. ASTRONOMY & ASTROPHYSICS,2004,424(2):477-484.
APA Fan, YZ,Wei, DM,&Wang, CF.(2004).The very early afterglow powered by, ultra-relativistic mildly magnetized outflows.ASTRONOMY & ASTROPHYSICS,424(2),477-484.
MLA Fan, YZ,et al."The very early afterglow powered by, ultra-relativistic mildly magnetized outflows".ASTRONOMY & ASTROPHYSICS 424.2(2004):477-484.
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