Swift observations of gs 1826-238
文献类型：期刊论文
| 作者 | Ji, L.1; Santangelo, A.1,2; Zhang, S.2; Ducci, L.1,3; Suleimanov, V.1,4 |
| 刊名 | Monthly notices of the royal astronomical society
 |
| 出版日期 | 2018-02-01 |
| 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 |
| 通讯作者 | Ji, l.(ji.long@astro.uni-tuebingen.de) |
| 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. |
| 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 |
| WOS类目 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000424343600013 |
| 出版者 | OXFORD UNIV PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2177959 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Ji, L. |
| 作者单位 | 1.Eberhard Karls Univ Tubingen, Inst Astron & Astrophy, Kepler Ctr Astro & Particle Phys, Sand 1, D-72076 Tubingen, Germany 2.Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China 3.Univ Geneva, ISDC Data Ctr Astrophys, 16 Chemin Ec, CH-1290 Versoix, Switzerland 4.Kazan Volga Reg Fed Univ, Kremlevskaja Str 18, Kazan 420008, Russia |
| 推荐引用方式 GB/T 7714 | Ji, L.,Santangelo, A.,Zhang, S.,et al. Swift observations of gs 1826-238[J]. Monthly notices of the royal astronomical society,2018,474(2):1583-1589. |
| APA | 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 | Ji, L.,et al."Swift observations of gs 1826-238".Monthly notices of the royal astronomical society 474.2(2018):1583-1589. |
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来源：高能物理研究所
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