HARD X-RAY EMISSIONS FROM CASSIOPEIA A OBSERVED BY INTEGRAL
文献类型：期刊论文
| 作者 | Wang, Wei1 ; Li, Zhuo2,3; Wang,Wei; Wang,Wei; Wang,Wei
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2016-07-10 |
| 卷号 | 825期号:2 |
| 关键词 | cosmic rays ISM: individual objects (Cassiopeia A) ISM: supernova remnants radiation mechanisms: non-thermal |
| 英文摘要 | Cassiopeia A (Cas A), as the nearby young remnant of a core-collapse supernova, is the best candidate for astrophysical studies in supernova explosion and its environment. We studied the hard X-ray emission from Cas A using the 10 year data of INTEGRAL observations, and first detected non-thermal continuum emission from the source up to 220 keV. The Ti-44 line emission at 68 and 78 keV is confirmed by our observations with a mean flux of similar to(2.2 +/- 0.4) x 10(-5) ph cm(-2) s(-1), corresponding to a Ti-44 yield in Cas A of (1.3 +/- 0.4) x 10(-4)M(circle dot). The continuum emission from 3 to 500 keV can be fit with a thermal bremsstrahlung of kT similar to 0.79 +/- 0.08 keV plus a power-law model of Gamma similar to 3.13 +/- 0.03. The non-thermal emission from Cas A is well fit by a power-law model without a cutoff up to 220 keV. This radiation characteristic is inconsistent with diffusive shock acceleration models with a remnant shock velocity of only 5000 km s(-1). The central compact object in Cas A cannot significantly contribute to the emission above 80 keV. Some possible physical origins of the non-thermal emission above 80 keV from the remnant shock are discussed. We deduce that the asymmetrical supernova explosion scenario of Cas A is a promising scenario for the production of high-energy synchrotron radiation photons, where a portion of the ejecta with a velocity of similar to 0.1c and opening angle of similar to 10 degrees can account for the 100 keV emission, as is consistent with the "jet" observed in Cas A. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000381940800020 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5285]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China 2.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China 3.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Wei,Li, Zhuo,Wang,Wei,et al. HARD X-RAY EMISSIONS FROM CASSIOPEIA A OBSERVED BY INTEGRAL[J]. ASTROPHYSICAL JOURNAL,2016,825(2). |
| APA | Wang, Wei,Li, Zhuo,Wang,Wei,Wang,Wei,&Wang,Wei.(2016).HARD X-RAY EMISSIONS FROM CASSIOPEIA A OBSERVED BY INTEGRAL.ASTROPHYSICAL JOURNAL,825(2). |
| MLA | Wang, Wei,et al."HARD X-RAY EMISSIONS FROM CASSIOPEIA A OBSERVED BY INTEGRAL".ASTROPHYSICAL JOURNAL 825.2(2016). |
入库方式： OAI收割
来源：国家天文台
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