| Cyg X-1高态和转换态的X射线短时标爆发 |
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| 引用本文： | 冯育新,李惕碚,陈黎,陈黎.Cyg X-1高态和转换态的X射线短时标爆发[J].中国天文和天体物理学报,1999(3). |
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| 作者姓名： | 冯育新 李惕碚 陈黎 陈黎 |
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| 作者单位： | 中国科学院高能物理研究所，宇宙线与高能天体物理开放实验室!北京１０００３９，中国科学院高能物理研究所，宇宙线与高能天体物理开放实验室!北京１０００３９，中国科学院高能物理研究所，宇宙线与高能天体物理开放实验室!北京１０００３９，北京师范大学天文系!北京１００８７５ |
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| 摘 要： | 分析ＲＸＴＥ卫星ＰＣＡ探测器对ＣｙｇＸ－１的观测数据，得到了其处于高态及高低态转换时的Ｘ射线短时标爆发（Ｓｈｏｔ）结构．在所观测到的三种态中是不对称的，并且不同的状态中Ｓｈｏｔ的结构有明显差异．Ｓｈｏｔ前后沿可分别由双指数函数近似拟合．Ｓｈｏｔ中的快时变过程是由慢的上升前沿和快的下降后沿构成．在所观测态中Ｓｈｏｔ平均宽度约为０．１１秒（ＦＷＨＭ），比低态时的宽度窄．同一状态中高能段的Ｓｈｏｔ宽度较低能段窄，且更加不对称．转换态的硬度在Ｓｈｏｔ峰前有明显下降，之后迅速上升，Ｓｈｏｔ期间的平均硬度低于非Ｓｈｏｔ期平均值；而高态时峰前硬度没有明显下降，Ｓｈｏｔ期间的平均硬度高于非Ｓｈｏｔ期间的平均值．本文还就Ｓｈｏｔ的产生机制进行了讨论．
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| 关 键 词： | 吸积盘 黑洞 CygX－1 X射线 |
The Short Timescale Bursts of Cyg X-1in the Transition and High States |
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| FENG Yu-xin, LI Ti-pei.The Short Timescale Bursts of Cyg X-1in the Transition and High States[J].Chinese Journal of Astronomy and Astrophysics,1999(3). |
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| Authors: | FENG Yu-xin LI Ti-pei |
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| Institution: | FENG Yu-xin, LI Ti-pei1 |
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| Abstract: | hort timescale bursts or "shot structures" of Cyg X-1 with one millisecond time binwere obtained from PCA/RXTE observation by superposing many shots lined-up at theirpeaks when Cyg X-1 was in transition or high states. In general, the rapid processes of shotsare composed with a slow rise and a fast decay. The detected structures of shots in variousstates are different. The duration of shot in transition states is longer than in high states.In both transition and high states, the duration is about 0.11 s which is shorter than in lowstates. The profiles of shots in high energy bands are more asymmetric than in low energybands. In the transition states, the average hardness during shots is lower than that of thesteady component. The mechanism of shot generation is also discussed. |
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| Keywords: | accretion disk-black hole physics-Cyg X-1- X-ray |
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