Swift observations of GS 1826-238
文献类型：期刊论文
| 作者 | Zhang S(张澍) ; Ji, L; Santangelo, A; Zhang, S; Ducci, L; Suleimanov, V
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2018 |
| 卷号 | 474期号:2页码:1583-1589 |
| 关键词 | stars: individual: GS 1826-238 stars: low-mass X-rays: binaries |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/stx2908 |
| 文献子类 | Article |
| 英文摘要 | GS 1826-238 is a well-studied low-mass X-ray binary neutron star. This source was in a persistent hard state since its discovery in 1988 and until 2014 June. After that, the source exhibited several softer periods of enhanced intensity in the energy range 2-20 keV. We studied the long-term light curves of MAXI (Monitor of All Sky X-ray Image) and Swift/BAT, and found clearly two branches in the MAXI-BAT and hardness-intensity diagrams, which correspond to the persistent state and softer periods, respectively. We analysed 21 Swift/XRT observations, of which four were located in the persistent state while the others were in softer periods or in a state between them. The XRT spectra could be generally fitted by using an absorbed Comptonization model with no other components required. We found a peculiar relationship between the luminosity and the hardness in the energy range of 0.6-10 keV: when the luminosity is larger (smaller) than 4 per cent-6 per cent L-edd, the hardness is anti-correlated (correlated) with luminosity. We also estimated the variability for each observation by using the fractional rms in the 0.1-10 Hz range. We found that the observations in the persistent state had a large fractional rms of similar to 25 per cent, similar to other low-mass X-ray binaries. However, the variability is mainly found in the range of 5 per cent-20 per cent during softer periods. We suggest that GS 1826-238 did not evolve into the soft state of atoll sources, and all the observed XRT observations during the softer periods resemble a peculiar intermediate state of atoll sources. |
| 电子版国际标准刊号 | 1365-2966 |
| WOS关键词 | X-RAY BINARIES ; CLOCKED BURSTER ; ACCRETION ; VARIABILITY ; MASS ; GS-1826-238 ; TELESCOPE ; SPECTRA ; MISSION ; STATES |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000424343600013 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/285632]  |
| 专题 | 高能物理研究所_粒子天体物理中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Zhang S,Ji, L,Santangelo, A,et al. Swift observations of GS 1826-238[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,474(2):1583-1589. |
| APA | 张澍,Ji, L,Santangelo, A,Zhang, S,Ducci, L,&Suleimanov, V.(2018).Swift observations of GS 1826-238.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,474(2),1583-1589. |
| MLA | 张澍,et al."Swift observations of GS 1826-238".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 474.2(2018):1583-1589. |
入库方式： OAI收割
来源：高能物理研究所
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