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| A study of the hard X-ray spectral tails in Scorpius X-1 using RXTE observations | |
Ding, G. Q.1 ; Chen, T. T.1,2; Qu, J. L.3
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| 2021 | |
| Source Publication | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| ISSN | 0035-8711 |
| Volume | 500Issue:1Pages:772-785 |
| Contribution Rank | 1 |
| Abstract | Using all the data of the High Energy X-ray Timing Experiment (HEXTE) on board the Rossi X-ray Timing Explorer for Scorpius X-1 from 1996 February to 2012 January, we systematically search for hard X-ray tails in the X-ray spectra in 20-220 keV and, together with the data of the Proportional Counter Array (PCA), investigate the evolution of the detected hard X-ray tails along the Z-track on its hardness-intensity diagram (HID). The hard X-ray tails are detected in 30 observations and their presence is not confined to a specific position on the HID. Our analysis suggests that from the horizontal branch (HB), through the normal branch (NB), to the flaring branch (FB) on the HID, the hard X-ray tail becomes hard and its flux decreases. Jointly fitting the PCA+HEXTE spectra in 3-220 keV, it is found that the Bulk-Motion Comptonization (BMC) could be an alternativemechanism for producing the hard X-ray tails on the HB and the NB of this source. The temperature of the seed photons for the BMC spans in the range of similar to(2.4-2.6) keV, indicating that the seed photons might come from the surface of the neutron star (NS) or the boundary layer and, therefore, the BMC process could take place around the NS or in the boundary layer. Some possible mechanisms for producing the hard X-ray tails on the FB are given. |
| Keyword | stars: neutron X-rays: binaries X-rays: individual: Scorpius X-1 X-rays: stars |
| DOI | 10.1093/mnras/staa2990 |
| URL | 查看原文 |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | K LINE EMISSION ; BLACK-HOLE ; ACCRETION DISKS ; TIMING EXPERIMENT ; ENERGY-SPECTRA ; EVOLUTION ; STATES ; COMPTONIZATION ; MODEL ; JET |
| Funding Project | Natural Science Foundation of China[U1838108] ; Natural Science Foundation of China[11673023] ; National Program on Key Research and Development Project[2016YFA0400804] |
| WOS Research Area | Astronomy & Astrophysics |
| WOS Subject | Astronomy & Astrophysics |
| WOS ID | WOS:000599134600057 |
| Publisher | OXFORD UNIV PRESS |
| Funding Organization | Natural Science Foundation of China ; National Program on Key Research and Development Project |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/3809 |
| Collection | 射电天文研究室_脉冲星研究团组 射电天文研究室 |
| Corresponding Author | Ding, G. Q. |
| Affiliation | 1.Chinese Acad Sci, Xinjiang Astron Observ, 150,Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China |
| First Author Affilication | Xinjiang Astronomical Observatory, Chinese Academy of Sciences |
| Corresponding Author Affilication | Xinjiang Astronomical Observatory, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Ding, G. Q.,Chen, T. T.,Qu, J. L.. A study of the hard X-ray spectral tails in Scorpius X-1 using RXTE observations[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,500(1):772-785. |
| APA | Ding, G. Q.,Chen, T. T.,&Qu, J. L..(2021).A study of the hard X-ray spectral tails in Scorpius X-1 using RXTE observations.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,500(1),772-785. |
| MLA | Ding, G. Q.,et al."A study of the hard X-ray spectral tails in Scorpius X-1 using RXTE observations".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 500.1(2021):772-785. |
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| Ding-2020-A study of（1062KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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