HARD X-RAY EMISSION AND Ti-44 LINE FEATURES OF THE TYCHO SUPERNOVA REMNANT
文献类型：期刊论文
| 作者 | Wang, Wei1; Li, Zhuo2,3,4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2014-07-10 |
| 卷号 | 789期号:2 |
| 关键词 | cosmic rays gamma rays: ISM ISM: supernova remnants supernovae: individual (Tycho) |
| 英文摘要 | A deep hard X-ray survey of the International Gamma-Ray Astrophysics Laboratory (INTEGRAL) satellite has detected for the first time non-thermal emission up to 90 keV in the Tycho supernova (SN) remnant. Its 3-100 keV spectrum is fitted with a thermal bremsstrahlung of kT similar to 0.81 +/- 0.45 keV plus a power-law model of Gamma similar to 3.01 +/- 0.16. Based on diffusive shock acceleration theory, this non-thermal emission, together with radio measurements, implies that the Tycho remnant may not accelerate protons up to >PeV but to hundreds TeV. Only heavier nuclei may be accelerated to the cosmic ray spectral "knee." In addition, using INTEGRAL, we search for soft gamma-ray lines at 67.9 and 78.4 keV that come from the decay of radioactive Ti-44 in the Tycho remnant. A bump feature in the 60-90 keV energy band, potentially associated with the Ti-44 line emission, is found with a marginal significance level of similar to 2.6 sigma. The corresponding 3 sigma upper limit on the Ti-44 line flux amounts to 1.5 x 10(-5) photon cm(-2) s(-1). Implications on the progenitor of the Tycho SN, considered to be a Type Ia SN prototype, are discussed. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000338674900032 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6468]  |
| 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, Beijing 100012, Peoples R China 2.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 3.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 4.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Wei,Li, Zhuo. HARD X-RAY EMISSION AND Ti-44 LINE FEATURES OF THE TYCHO SUPERNOVA REMNANT[J]. ASTROPHYSICAL JOURNAL,2014,789(2). |
| APA | Wang, Wei,&Li, Zhuo.(2014).HARD X-RAY EMISSION AND Ti-44 LINE FEATURES OF THE TYCHO SUPERNOVA REMNANT.ASTROPHYSICAL JOURNAL,789(2). |
| MLA | Wang, Wei,et al."HARD X-RAY EMISSION AND Ti-44 LINE FEATURES OF THE TYCHO SUPERNOVA REMNANT".ASTROPHYSICAL JOURNAL 789.2(2014). |
入库方式： OAI收割
来源：国家天文台
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