PMO OpenIR  > 南极天文中心
POLARIZATION EVOLUTION OF EARLY OPTICAL AFTERGLOWS OF GAMMA-RAY BURSTS
Lan, Mi-Xiang1,2; Wu, Xue-Feng3,4; Dai, Zi-Gao1,2
2016-01-10
Source PublicationASTROPHYSICAL JOURNAL
Volume816Issue:2
AbstractThe central engine and jet composition of gamma-ray bursts (GRBs) remain mysterious. Here we suggest that observations on the polarization evolution of early optical afterglows may shed light on these questions. We first study the dynamics of a reverse shock and a forward shock that are generated during the interaction of a relativistic jet and its ambient medium. The jet is likely magnetized with a globally large-scale magnetic field from the central engine. The existence of the reverse shock requires that the magnetization degree of the jet should not be high (sigma <= 1), so that the jet is mainly composed of baryons and leptons. We then calculate the light curves and polarization evolution of early optical afterglows. and find that when the polarization position angle changes by 90 degrees during the early afterglow, the polarization degree is zero for a toroidal magnetic field but is very likely to be nonzero for an aligned magnetic field. This result would be expected to provide a probe for the central engine of GRBs. because an aligned field configuration could originate from a magnetar central engine and a toroidal field configuration could be produced from a black hole via the Blandford-Znajek mechanism. Finally, for such two kinds of magnetic field configurations, we fit the observed data of the early optical afterglow of GRB 120308A equally well.
KeywordGamma-ray Burst: General Magnetic Fields Polarization Radiation Mechanisms: Non-thermal Shock Waves
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.3847/0004-637X/816/2/73
WOS KeywordMAGNETIC-FIELDS ; BLACK-HOLES ; LINEAR-POLARIZATION ; MILLISECOND PULSARS ; FLUID-DYNAMICS ; CENTRAL ENGINE ; NEUTRON-STARS ; BLAST WAVES ; EMISSION ; FIREBALLS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000368238500025
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16112
Collection南极天文中心
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
2.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
4.Chinese Acad Sci, Joint Ctr Particle Nucl Phys & Cosmol, Purple Mt Observ, Nanjing Univ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Lan, Mi-Xiang,Wu, Xue-Feng,Dai, Zi-Gao. POLARIZATION EVOLUTION OF EARLY OPTICAL AFTERGLOWS OF GAMMA-RAY BURSTS[J]. ASTROPHYSICAL JOURNAL,2016,816(2).
APA Lan, Mi-Xiang,Wu, Xue-Feng,&Dai, Zi-Gao.(2016).POLARIZATION EVOLUTION OF EARLY OPTICAL AFTERGLOWS OF GAMMA-RAY BURSTS.ASTROPHYSICAL JOURNAL,816(2).
MLA Lan, Mi-Xiang,et al."POLARIZATION EVOLUTION OF EARLY OPTICAL AFTERGLOWS OF GAMMA-RAY BURSTS".ASTROPHYSICAL JOURNAL 816.2(2016).
Files in This Item:
File Name/Size DocType Version Access License
2016024.pdf(1273KB) 开放获取Apache LicenseView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Lan, Mi-Xiang]'s Articles
[Wu, Xue-Feng]'s Articles
[Dai, Zi-Gao]'s Articles
Baidu academic
Similar articles in Baidu academic
[Lan, Mi-Xiang]'s Articles
[Wu, Xue-Feng]'s Articles
[Dai, Zi-Gao]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Lan, Mi-Xiang]'s Articles
[Wu, Xue-Feng]'s Articles
[Dai, Zi-Gao]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 2016024.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.