Physical origin of multi-wavelength emission of GRB 100418A and implications for its progenitor
文献类型：期刊论文
| 作者 | Jia, Lan-Wei1,2,3; Wu, Xue-Feng4 ; Lu, Hou-Jun2,3,5; Hou, Shu-Jin2,3,6,7; Liang, En-Wei2,3
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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| 出版日期 | 2012-04-01 |
| 卷号 | 12期号:4页码:411-418 |
| ISSN号 | 1674-4527 |
| 关键词 | gamma-rays: bursts individual: GRB 060614, GRB 100418A |
| 英文摘要 | Swift GRB 100418A is a long burst at z = 0.624 without detection of any associated supernova (SN). Its light curves in both the prompt and afterglow phases are similar to GRB 060614, a nearby long GRB without an associated SN. We analyze the observational data of this event and discuss the possible origins of its multi-wavelength emission. We show that its joint light curve at 1 keV derived from Swift BAT and XRT observations is composed of two distinguished components. The first component, whose spectrum is extremely soft (Gamma = 4.32), ends with a steep decay segment, indicating the internal origin of this component. The second component is a slowly-rising, broad bump which peaks at similar to 10(5) s post the BAT trigger. Assuming that the late bump is due to onset of the afterglow, we derive the initial Lorentz factor (Gamma(0)) of the GRB fireball and find that it significantly deviates from the relation between the Gamma(0) and isotropic gamma-ray energy derived from typical GRBs. We also check whether it follows the same anti-correlation between X-ray luminosity and the break time observed in the shallow decay phase of many typical GRBs, which is usually regarded as a signal of late energy injection from the GRB central engine. However, we find that it does not obey this correlation. We propose that the late bump could be contributed by a two-component jet. We fit the second component with an off-axis jet model for a constant medium density and find the late bump can be represented by the model. The derived jet half-opening angle is 0.30 rad and the viewing angle is 0.315 rad. The medium density is 0.05 cm(-3), possibly suggesting that it may be from a merger of compact stars. The similarity between GRBs 060614 and 100418A may indicate that the two GRBs are from the same population and the late bump observed in the two GRBs may be a signal of a two-component jet powered by the GRB central engine. |
| 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] | GAMMA-RAY BURST ; CONTINUOUS ENERGY INJECTION ; CANONICAL LIGHT CURVES ; COMPREHENSIVE ANALYSIS ; SWIFT DATA ; AFTERGLOWS ; SUPERNOVA ; REDSHIFT ; LONG ; GRB-060614 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000303278100005 |
| 公开日期 | 2013-01-31 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/8108]  |
| 专题 | 紫金山天文台_南极天文中心 |
| 作者单位 | 1.Guangzhou Univ, Dept Phys, Guangzhou 510006, Guangdong, Peoples R China 2.Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China 3.Guangxi Univ, GXU NAOC Ctr Astrophys & Space Sci, Nanning 530004, Peoples R China 4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 5.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA 6.Xiamen Univ, Dept Phys, Xiamen 361005, Peoples R China 7.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jia, Lan-Wei,Wu, Xue-Feng,Lu, Hou-Jun,et al. Physical origin of multi-wavelength emission of GRB 100418A and implications for its progenitor[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2012,12(4):411-418. |
| APA | Jia, Lan-Wei,Wu, Xue-Feng,Lu, Hou-Jun,Hou, Shu-Jin,&Liang, En-Wei.(2012).Physical origin of multi-wavelength emission of GRB 100418A and implications for its progenitor.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,12(4),411-418. |
| MLA | Jia, Lan-Wei,et al."Physical origin of multi-wavelength emission of GRB 100418A and implications for its progenitor".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 12.4(2012):411-418. |
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来源：紫金山天文台
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