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A comprehensive analysis of Swift XRT data. III. Jet break candidates in x-ray and optical afterglow light curves
Liang, En-Wei1,2; Racusin, Judith L.3; Zhang, Bing1; Zhang BB(张彬彬)1,4; Burrows, David N.3; Liang, EW (reprint author), Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA.
Source PublicationASTROPHYSICAL JOURNAL
2008-03
Volume675Issue:1Pages:528-552
DOI10.1086/524701
Contribution Rank第4完成单位
Indexed BySCI
KeywordGamma Rays : Bursts Radiation Mechanisms : Nonthermal X-rays
AbstractThe Swift XRT data for 179 GRBs (050124 to 070129) and the optical afterglow data for 57 pre- and post-Swift GRBs are analyzed to explore whether the observed breaks in the afterglow light curves can be interpreted as jet breaks, as well as their implications for jet energetics. We find that no burst is included in our "Platinum" sample, in which the data fully satisfy the jet break criteria. By relaxing one or more of the requirements for a jet break, candidates to various degrees are identified. In the X-ray band, 42 of 103 well-sampled X-ray light curves have a decay slope greater than or similar to 1.5 in the postbreak segment (the "Bronze" sample), and 27 of these also satisfy the closure relations of the forward-shock models ("Silver" sample). The numbers of "Bronze" and "Silver" candidates in the optical light curves are 27 and 23, respectively. The X-ray break time is earlier than that in the optical bands. Among 13 bursts having both optical and X-ray light curves, only seven have an achromatic break, and even in these cases, only in one band do the data satisfy the closure relations ("Gold" sample). These results raise concerns about interpreting the breaks as jet breaks and further inferring GRB energetics. Assuming that the "Silver" and "Gold" breaks are jet breaks, we derive jet opening angles (theta(j)) and kinetic energies (E(K)) or lower limits on them and find that the EK distribution is much more scattered than the pre-Swift sample, but a tentative anticorrelation between theta(j) and E(K,iso) is found, indicating that the E(K) could still be quasi-universal.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeReview
ISSN0004-637X
URL查看原文
WOS IDWOS:000253562000041
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordBURST AFTERGLOWS ; THEORETICAL IMPLICATIONS ; PHYSICAL PARAMETERS ; ACHROMATIC BREAKS ; RELATIVISTIC JETS ; ENERGY INJECTION ; FIREBALL MODEL ; HOST GALAXY ; GRB 970508 ; 1ST SURVEY
Citation statistics
Cited Times:139[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9366
Collection星系研究组
Corresponding AuthorLiang, EW (reprint author), Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA.
Affiliation1.Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154
2.Department of Physics, Guangxi University, Nanning, 530004 Guanxgi, China
3.Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802
4.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, 650011 Kunming, China
Recommended Citation
GB/T 7714
Liang, En-Wei,Racusin, Judith L.,Zhang, Bing,et al. A comprehensive analysis of Swift XRT data. III. Jet break candidates in x-ray and optical afterglow light curves[J]. ASTROPHYSICAL JOURNAL,2008,675(1):528-552.
APA Liang, En-Wei,Racusin, Judith L.,Zhang, Bing,张彬彬,Burrows, David N.,&Liang, EW .(2008).A comprehensive analysis of Swift XRT data. III. Jet break candidates in x-ray and optical afterglow light curves.ASTROPHYSICAL JOURNAL,675(1),528-552.
MLA Liang, En-Wei,et al."A comprehensive analysis of Swift XRT data. III. Jet break candidates in x-ray and optical afterglow light curves".ASTROPHYSICAL JOURNAL 675.1(2008):528-552.
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