Variations and correlations in cyclotron resonant scattering features of Vela X-1 studied by INTEGRAL
文献类型：期刊论文
| 作者 | Wang, Wei |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2014-05-01 |
| 卷号 | 440期号:2页码:1114-1124 |
| 关键词 | stars: individual: Vela X-1 stars: magnetic field stars: neutron X-rays: binaries |
| 英文摘要 | Long-term hard X-ray monitoring observations of high-mass X-ray binary Vela X-1 from 2003-2011 have been carried out by the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL). I systematically analysed the average hard X-ray spectra of Vela X-1 from 3-200 keV, with the main aims of detecting cyclotron resonant scattering features and studying their pattern of variation with accreting luminosity and orbital phase. The cyclotron scattering lines of Vela X-1 at similar to 22-27 and 49-57 keV are confirmed in the average spectra of Vela X-1. However, in flare states with hard X-ray luminosity higher than similar to 5 x 10(36) erg s(-1) (3-100 keV), the fundamental line cannot be detected. This feature suggests that a fan-like beam radiation pattern is expected in high-luminosity ranges of Vela X-1. Variations of the cyclotron line energies and depths are discovered, which may change with continuum spectral properties. Both cyclotron line energies show no correlations with X-ray luminosity. The fundamental line energy shows no significant correlations with photon index and cut-off energy, while the first harmonic energy shows a positive correlation with photon index and exponential cut-off energy. The energy ratio of two cyclotron lines, always higher than 2, has a weak correlation with photon index and cut-off energy. These relations support the idea that the X-ray spectral properties of accreting X-ray pulsars are affected by cyclotron resonance scattering. In the case of Vela X-1, the broader and deeper first harmonic would play the main role in causing the spectral variations. The positive correlations between the ratio of line width to energy and the corresponding depth for both lines support a cylindrical column accretion geometry in Vela X-1. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000334742200013 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6519]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Wei. Variations and correlations in cyclotron resonant scattering features of Vela X-1 studied by INTEGRAL[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,440(2):1114-1124. |
| APA | Wang, Wei.(2014).Variations and correlations in cyclotron resonant scattering features of Vela X-1 studied by INTEGRAL.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,440(2),1114-1124. |
| MLA | Wang, Wei."Variations and correlations in cyclotron resonant scattering features of Vela X-1 studied by INTEGRAL".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 440.2(2014):1114-1124. |
入库方式： OAI收割
来源：国家天文台
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