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Spectral properties of the neutron star low-mass X-ray binaries 4U 1636-53, XTE J1739-285, and MAXI J1816-195

文献类型：期刊论文

作者Fei, Zhenyan5,6; Lyu, Ming5,6; Zhang GB(张国宝)3,4; Yang, Xuejuan5,6; García, Federico2
刊名Astronomy and Astrophysics
出版日期2025-03-01
卷号695
关键词accretion accretion disks binaries: spectroscopic stars: neutron
ISSN号0004-6361
DOI10.1051/0004-6361/202451211
产权排序第3完成单位
文献子类Journal article (JA)
英文摘要We investigated simultaneous NICER plus NuSTAR observations of the three neutron star low-mass X-ray binaries 4U 1636-53, XTE J1739-285, and MAXI J1816-195 using the latest reflection models. The seed photons in our models that are fed into the corona originated from either the neutron star (NS) or the accretion disk. We found that for the sources in the hard spectral state, more than ∼50% of the NS photons enter the corona when the NS provides seed photons, while only ∼3-5% of the disk photons enter the corona when the seed photons come from the disk. This finding, together with the derived small height of the corona, favors a lamp-post geometry or a boundary layer scenario in which the corona is close to the central NS. Additionally, we found that the source of the seed photons has a strong influence on the significance of the NS radiation, especially for the soft spectral state. This result may help us to explain why the NS radiation in MAXI J1816-195 was weak in previous work. More importantly, for the first time, we explored the properties of the corona in the NS systems with the compactness (l-θ) diagram. We found that coronae in NS systems all lie on the left side of the pair-production forbidden region, away from the predicted pair-production lines. This finding indicates that either the corona in these NS systems is not pair dominated, possibly due to the additional cooling from NS photons, or the corona is composed of both thermal and nonthermal electrons. © The Authors 2025.
学科主题天文学 ; 恒星与银河系 ; 天体物理学 ; 高能天体物理学
URL标识查看原文
资助项目National Natural Science Foundation of China[12122302]
语种英语
资助机构National Natural Science Foundation of China[12122302]
源URL[http://ir.ynao.ac.cn/handle/114a53/28218]  
专题星系类星体研究组
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1., Villa Elisa, Argentina
2.Instituto Argentino de Radioastronomía (CCT La Plata CONICET, CICPBA, UNLP), C.C.5,
3.Key Laboratory for the Structure and Evolution of Celestial Objects, CAS, Kunming, 650216, China;
4.Yunnan Observatories, Chinese Academy of Sciences (CAS), Kunming, 650216, China;
5.Key Laboratory of Stars and Interstellar Medium, Xiangtan University, Hunan, Xiangtan, 411105, China;
6.Department of Physics, Xiangtan University, Hunan, Xiangtan, 411105, China;
推荐引用方式
GB/T 7714		 Fei, Zhenyan,Lyu, Ming,Zhang GB,et al. Spectral properties of the neutron star low-mass X-ray binaries 4U 1636-53, XTE J1739-285, and MAXI J1816-195[J]. Astronomy and Astrophysics,2025,695.
APA Fei, Zhenyan,Lyu, Ming,张国宝,Yang, Xuejuan,&García, Federico.(2025).Spectral properties of the neutron star low-mass X-ray binaries 4U 1636-53, XTE J1739-285, and MAXI J1816-195.Astronomy and Astrophysics,695.
MLA Fei, Zhenyan,et al."Spectral properties of the neutron star low-mass X-ray binaries 4U 1636-53, XTE J1739-285, and MAXI J1816-195".Astronomy and Astrophysics 695(2025).

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