Two Complete Spectral Transitions of Swift J0243.6+6124 Observed by Insight-HXMT
文献类型：期刊论文
| 作者 | Kong,L. D.2,3; Zhang,S.2; Chen,Y. P.2; Zhang,S. N.2,3; Ji,L.4; Doroshenko,V.4; Wang,P. J.2,3; Tao,L.2; Ge,M. Y.2; Liu,C. Z.2 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2020-10-01 |
| 卷号 | 902期号:1 |
| ISSN号 | 0004-637X |
| 关键词 | Accretion Stellar accretion disks Binary pulsars Magnetic fields Neutron stars X-ray binary stars X-ray astronomy |
| DOI | 10.3847/1538-4357/abb241 |
| 英文摘要 | Abstract We performed the broadband (1–100 keV) spectral analysis of the first Galactic Be ultraluminous X-ray pulsar (BeULX) Swift J0243.6+6124 observed by Insight-HXMT during the 2017?2018 outburst. The results show spectral transitions at two typical luminosities, roughly consistently with those reported previously via pure timing analysis. We find that the spectrum evolves and becomes softer and has higher cutoff energies until the luminosity reaches L1 (～1.5 ?×? 1038 erg s?1). Afterwards the spectrum becomes harder with lower cutoff energies until the luminosity increases to L2 (～4.4 ?×?1038 erg s?1), around which the second spectral transition occurs. Beyond L2, the spectrum softens again and has larger cutoff energies. Similar behaviors were observed previously in other high-mass X-ray binary systems (HMXBs), especially for the second transition at higher luminosities, which is believed to have a correlation with the magnetic field of the harbored neutron star. Accordingly, we speculate that Swift J0243.6+6124 owns a neutron star with magnetic field strength >1013 G. The spectral transition at around L1 of Swift J0243.6+6124 is first observed thoroughly for any HMXB outburst characterized by strong evolution of the thermal component: the temperature of the blackbody drops sharply accompanied by a sudden increase of the blackbody radius. These spectral transitions can in principle be understood in a general scenario of balancing the emission patterns between the pencil and the fan beams at the magnetic pole, for which the extreme brightness of Swift J0243.6+6124 may provide an almost unique lab to probe the details. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-902-1-ABB241 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/61964]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Kong,L. D. |
| 作者单位 | 1.Department of Astronomy, Beijing Normal University, Beijing 100088, 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; kongld@ihep.ac.cn, szhang@ihep.ac.cn 3.University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 4.Institut für Astronomie und Astrophysik, Kepler Center for Astro and Particle Physics, Eberhard Karls, Universit?t, Sand 1, D-72076 Tübingen, Germany 5.Department of Astronomy, Tsinghua University, Beijing 100084, People’s Republic of China 6.Department of Physics, Tsinghua University, Beijing 100084, People’s Republic of China 7.Department of Engineering Physics, Tsinghua University, Beijing 100084, People’s Republic of China 8.Computing Division, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049, People’s Republic of China 9.Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012k, People’s Republic of China 10.School of Physics and Optoelectronics, Xiangtan University, Yuhu District, Xiangtan, Hunan, 411105, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Kong,L. D.,Zhang,S.,Chen,Y. P.,et al. Two Complete Spectral Transitions of Swift J0243.6+6124 Observed by Insight-HXMT[J]. The Astrophysical Journal,2020,902(1). |
| APA | Kong,L. D..,Zhang,S..,Chen,Y. P..,Zhang,S. N..,Ji,L..,...&Zhuang,R. L..(2020).Two Complete Spectral Transitions of Swift J0243.6+6124 Observed by Insight-HXMT.The Astrophysical Journal,902(1). |
| MLA | Kong,L. D.,et al."Two Complete Spectral Transitions of Swift J0243.6+6124 Observed by Insight-HXMT".The Astrophysical Journal 902.1(2020). |
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来源：国家天文台
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