NAOC Open IR  > 光学天文研究部
Physical processes shaping gamma-ray burst X-ray afterglow light curves: Theoretical implications from the Swift X-ray telescope observations
Zhang, B; Fan, YZ; Dyks, J; Kobayashi, S; Meszaros, P; Burrows, DN; Nousek, JA; Gehrels, N
2006-05-01
Source PublicationASTROPHYSICAL JOURNAL
Volume642Issue:1Pages:354-370
AbstractWith the successful launch of the Swift Gamma-Ray Burst Explorer, a rich trove of early X-ray afterglow data has been collected by its onboard X-Ray Telescope (XRT). Some interesting features are emerging, including a distinct rapidly decaying component preceding the conventional afterglow component in many sources, a shallow decay component before the more "normal'' decay component observed in a good fraction of GRBs, and X-ray flares in nearly half of the afterglows. In this paper we systematically analyze the possible physical processes that shape the properties of the early X-ray afterglow light curves and use the data to constrain various models. We suggest that the steep decay component is consistent with the tail emission of the prompt gamma-ray bursts and/or the X-ray flares. This provides strong evidence that the prompt emission and afterglow emission are likely two distinct components, supporting the internal origin of the GRB prompt emission. The shallow decay segment observed in a group of GRBs suggests that very likely the forward shock keeps being refreshed for some time. This might be caused by either a long-lived central engine, or a wide distribution of the shell Lorentz factors, or else possibly the deceleration of a Poynting flux-dominated flow. X-ray flares suggest that the GRB central engine is very likely still active after the prompt gamma-ray emission is over, but with a reduced activity at later times. In some cases, the central engine activity even extends to days after the burst triggers. Analyses of early X-ray afterglow data reveal that GRBs are indeed highly relativistic events and that early afterglow data of many bursts, starting from the beginning of the XRT observations, are consistent with the afterglow emission from an ISM environment.
KeywordGamma Rays : Bursts Radiation Mechanisms : Nonthermal Shock Waves
Indexed BySCI
Language英语
WOS IDWOS:000237206600028
Citation statistics
Cited Times:677[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8125
Collection光学天文研究部
Affiliation1.Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Chinese Acad Sci, Inst Geog, Natl Astron Observ, Beijing 100012, Peoples R China
4.Nicholas Copernicus Astron Ctr, Lab Astrophys 1, PL-87100 Torun, Poland
5.Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA
6.Penn State Univ, Dept Phys, University Pk, PA 16802 USA
7.Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead CH41 1LD, Merseyside, England
8.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
Recommended Citation
GB/T 7714
Zhang, B,Fan, YZ,Dyks, J,et al. Physical processes shaping gamma-ray burst X-ray afterglow light curves: Theoretical implications from the Swift X-ray telescope observations[J]. ASTROPHYSICAL JOURNAL,2006,642(1):354-370.
APA Zhang, B.,Fan, YZ.,Dyks, J.,Kobayashi, S.,Meszaros, P.,...&Gehrels, N.(2006).Physical processes shaping gamma-ray burst X-ray afterglow light curves: Theoretical implications from the Swift X-ray telescope observations.ASTROPHYSICAL JOURNAL,642(1),354-370.
MLA Zhang, B,et al."Physical processes shaping gamma-ray burst X-ray afterglow light curves: Theoretical implications from the Swift X-ray telescope observations".ASTROPHYSICAL JOURNAL 642.1(2006):354-370.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Zhang, B]'s Articles
[Fan, YZ]'s Articles
[Dyks, J]'s Articles
Baidu academic
Similar articles in Baidu academic
[Zhang, B]'s Articles
[Fan, YZ]'s Articles
[Dyks, J]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Zhang, B]'s Articles
[Fan, YZ]'s Articles
[Dyks, J]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

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