A REVISED LIMIT OF THE LORENTZ FACTORS OF GAMMA-RAY BURSTs WITH TWO EMITTING REGIONS
文献类型：期刊论文
| 作者 | Zou, Yuan-Chuan1; Fan, Yi-Zhong2 ; Piran, Tsvi3
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| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2011 |
| 卷号 | 726期号:1页码:L2(5pp) |
| 关键词 | gamma-ray burst: general radiation mechanisms: non-thermal relativistic processes |
| ISSN号 | 2041-8205 |
| 英文摘要 | Fermi observations of GeV emission from gamma-ray bursts (GRBs) have suggested that the Lorentz factor of some GRBs is around a thousand or even higher. At the same time, the same Fermi observations have shown an extended GeV emission indicating that this higher energy emission might be a part of the afterglow and it does not come from the same region as the lower energy prompt emission. If this interpretation is correct then we may have to reconsider the opacity limits on the Lorentz factor which are based on a one-zone model. We describe here a two-zone model in which the GeV photons are emitted in a larger radius than theMeV photons and we calculate the optical depth for pair creation of a GeV photon passing the lower energy photons shell. We find that, as expected, the new two-zone limits on the Lorentz factor are significantly lower. When applied to Fermi bursts the corresponding limits are lower by a factor of five compared to the one-zone model. It is possible that both the MeV and GeV regions have relatively modest Lorentz factors (similar to 200-400). This two-zone limit is significantly softer than the one-zone limit. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | HIGH-ENERGY EMISSION ; FERMI OBSERVATIONS ; GRB 080916C ; SPECTRAL COMPONENT ; INTERNAL SHOCKS ; EXTERNAL SHOCK ; AFTERGLOW ; OUTFLOWS ; PROMPT ; MODEL |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000285296600002 |
| 公开日期 | 2012-08-07 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/4545]  |
| 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.Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 3.Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel |
| 推荐引用方式 GB/T 7714 | Zou, Yuan-Chuan,Fan, Yi-Zhong,Piran, Tsvi. A REVISED LIMIT OF THE LORENTZ FACTORS OF GAMMA-RAY BURSTs WITH TWO EMITTING REGIONS[J]. ASTROPHYSICAL JOURNAL LETTERS,2011,726(1):L2(5pp). |
| APA | Zou, Yuan-Chuan,Fan, Yi-Zhong,&Piran, Tsvi.(2011).A REVISED LIMIT OF THE LORENTZ FACTORS OF GAMMA-RAY BURSTs WITH TWO EMITTING REGIONS.ASTROPHYSICAL JOURNAL LETTERS,726(1),L2(5pp). |
| MLA | Zou, Yuan-Chuan,et al."A REVISED LIMIT OF THE LORENTZ FACTORS OF GAMMA-RAY BURSTs WITH TWO EMITTING REGIONS".ASTROPHYSICAL JOURNAL LETTERS 726.1(2011):L2(5pp). |
入库方式： OAI收割
来源：紫金山天文台
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