Insight-HXMT Firm Detection of the Highest-energy Fundamental Cyclotron Resonance Scattering Feature in the Spectrum of GRO J1008-57
文献类型：期刊论文
| 作者 | Ge,M. Y.2; Ji,L.3; Zhang,S. N.2,4; Santangelo,A.3; Liu,C. Z.2; Doroshenko,V.3; Staubert,R.3; Qu,J. L.2; Zhang,S.2; Lu,F. J.2 |
| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2020-08-01 |
| 卷号 | 899期号:1 |
| ISSN号 | 2041-8205 |
| 关键词 | High mass x-ray binary stars Pulsars Magnetic fields |
| DOI | 10.3847/2041-8213/abac05 |
| 英文摘要 | Abstract We report on the observation of the accreting pulsar GRO J1008-57 performed by Insight-Hard X-ray Modulation Telescope (HXMT) at the peak of the source’s 2017 outburst. Pulsations are detected with a spin period of 93.283(1) s. The pulse profile shows double peaks at soft X-rays, and only one peak above 20 keV. The spectrum is well described by the phenomenological models of X-ray pulsars. A cyclotron resonant scattering feature (CRSF) is detected with very high statistical significance at a centroid energy of keV, for the reference continuum and line models, HIGHECUT and GABS, respectively. Detection is very robust with respect to different continuum models. The line energy is significantly higher than what is suggested from previous observations, which provided very marginal evidence for the line. This establishes a new record for the centroid energy of a fundamental CRSF observed in accreting pulsars. We also discuss the accretion regime of the source during the Insight-HXMT observation. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:2041-8205-899-1-ABAC05 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/62785]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China 2.Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049, People’s Republic of China; zhangsn@ihep.ac.cn 3.Institut für Astronomie und Astrophysik, Kepler Center for Astro and Particle Physics, Eberhard Karls, Universit?t, Sand 1, D-72076 Tübingen, Germany ji.long@astro.uni-tuebingen.de 4.University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 5.Department of Astronomy, Tsinghua University, Beijing 100084, People’s Republic of China 6.Department of Astronomy, Beijing Normal University, Beijing 100088, People’s Republic of China 7.Department of Physics, Tsinghua University, Beijing 100084, People’s Republic of China 8.Department of Engineering Physics, Tsinghua University, Beijing 100084, People’s Republic of China 9.College of physics Sciences & Technology, Hebei University, No. 180 Wusi Dong Road, Lian Chi District, Baoding City, Hebei Province 071002 People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Ge,M. Y.,Ji,L.,Zhang,S. N.,et al. Insight-HXMT Firm Detection of the Highest-energy Fundamental Cyclotron Resonance Scattering Feature in the Spectrum of GRO J1008-57[J]. The Astrophysical Journal Letters,2020,899(1). |
| APA | Ge,M. Y..,Ji,L..,Zhang,S. N..,Santangelo,A..,Liu,C. Z..,...&Zhu,Y..(2020).Insight-HXMT Firm Detection of the Highest-energy Fundamental Cyclotron Resonance Scattering Feature in the Spectrum of GRO J1008-57.The Astrophysical Journal Letters,899(1). |
| MLA | Ge,M. Y.,et al."Insight-HXMT Firm Detection of the Highest-energy Fundamental Cyclotron Resonance Scattering Feature in the Spectrum of GRO J1008-57".The Astrophysical Journal Letters 899.1(2020). |
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