Polarization evolution accompanying the very early sharp decline of gamma-ray burst X-ray afterglows

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 宇宙伽马暴、中子星及相关物理研究团组

	Polarization evolution accompanying the very early sharp decline of gamma-ray burst X-ray afterglows
	Fan, Yi-Zhong1,2,3 ; Xu, Dong 4; Wei, Da-Ming1,2,5
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2008-06-11
卷号	387 期号:1 页码:92-96
关键词	radiation mechanisms : non-thermal ISM : jets and outflows gamma-rays : bursts
ISSN号	0035-8711
英文摘要	In the synchrotron radiation model, the polarization property depends on both the configuration of the magnetic field and the geometry of the visible emitting region. Some peculiar behaviours in the X-ray afterglows of gamma-ray bursts (GRBs) observed with Swift, such as energetic flares and a plateau followed by a sharp drop, might be highly linearly polarized because the outflows powering these behaviours may be dominated by Poynting flux. The breakdown of the symmetry of the visible emitting region may also be well hidden in the peculiar X-ray data and may give rise to interesting polarization signatures. In this paper, we focus on the polarization accompanying the very early sharp decline of GRB X-ray afterglows. We show that strong polarization evolution is possible in both the high latitude emission model and the dying central engine model, which are used to interpret this sharp X-ray decline. It is thus not easy to efficiently probe the physical origin of the very early X-ray sharp decline with future polarimetry. Strong polarization evolution is also possible in the decline phase of X-ray flares and in the shallow decline phase of X-ray light curves characterized by chromatic X-ray versus optical breaks. A detector such as the X-ray Telescope (XRT), but with polarization capability, on board a satellite like Swift would be suitable for testing our predictions.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	SWIFT XRT DATA ; LINEAR-POLARIZATION ; GRB AFTERGLOWS ; OPTICAL FLARE ; LIGHT CURVES ; EMISSION ; MODEL ; JETS
收录类别	SCI
语种	英语
WOS记录号	WOS:000256378700008
公开日期	2011-12-30
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1955]
专题	紫金山天文台_宇宙伽马暴、中子星及相关物理研究团组
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Neils Bohr Int Acad, Niels Bohr Inst, DK-2100 Copenhagen, Denmark 4.Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark 5.Nanjing Univ, Joint Ctr Particle Nucl Phys & Cosmol, Purple Mt Observ, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Fan, Yi-Zhong,Xu, Dong,Wei, Da-Ming. Polarization evolution accompanying the very early sharp decline of gamma-ray burst X-ray afterglows[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2008,387(1):92-96.
APA	Fan, Yi-Zhong,Xu, Dong,&Wei, Da-Ming.(2008).Polarization evolution accompanying the very early sharp decline of gamma-ray burst X-ray afterglows.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,387(1),92-96.
MLA	Fan, Yi-Zhong,et al."Polarization evolution accompanying the very early sharp decline of gamma-ray burst X-ray afterglows".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 387.1(2008):92-96.