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首页> 外文学位 >X-ray timing and spectral observations of galactic black hole candidate XTE J1550-564 during outburst.
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X-ray timing and spectral observations of galactic black hole candidate XTE J1550-564 during outburst.

机译：爆发期间银河黑洞候选者XTE J1550-564的X射线定时和光谱观察。

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摘要

The timing and spectral properties of the soft X-ray transient (SXT) and microquasar XTE J1550-564 during outburst are studied, emphasizing observations made by the Unconventional Stellar Aspect (USA) Experiment. USA data show a low-frequency quasi-periodic oscillation (LFQPO) with a centroid frequency that tends to increase with increasing flux and a fractional rms amplitude which is correlated with the USA hardness ratio. Several high-frequency quasi-periodic oscillations (HFQPOs) were detected by RXTE, during periods where the LFQPO is seen to be weakening or not detectable at all. The evolution of the USA hardness ratio with time and source flux is examined. The hardness-intensity diagram shows counterclockwise cyclical evolution and possibly indicates the presence of two independent accretion flows: a geometrically thin, optically thick accretion disk and a hot sub-Keplerian flow.; A model for production of the LFQPO in XTE J1550-564 is proposed, assuming that the LFQPO is a result of acoustic oscillations in a hot sub-Keplerian transition layer (TL). Under this acoustic oscillation model (AOM), the TL is an acoustic cavity having an outer boundary at RTL, where R TL ≈ Rinner, with Rinner being the radius of the accretion disk inner edge. TL resonance is interpreted as a mechanism for the LFQPO and the eigenfrequencies are associated with the LFQPO frequencies, ν LFQPO. This LFQPO mechanism requires the presence of a TL, capable of inverse-Compton scattering, with RTL regulated by a cool Keplerian accretion disk.; Support for the AOM is provided by the correlation of the LFQPO percent rms amplitude with the USA hardness ratio, and other correlations and anti-correlations found in the USA, RXTE and BATSE observations. LFQPO data show increasing rms amplitude with increasing high energy flux and increasing νLFQPO with increasing low energy flux. These observations indicate that ν LFQPO is set by the accretion disk inner edge. The spectrally inferred Rinner is commensurate, showing a decrease with increasing ν LFQPO. Finally, RXTE spectral data indicate that the LFQPO is detectable only when the power law contribution is greater than 20% of the low energy flux, providing evidence that the LFQPO mechanism is dependent on the TL. The AOM is consistent with all of the above observations and it has the ability to predict the approximate value of Rinner. Comparison between spectrally determined Rinner and the AOM measurement of RTL shows good agreement.
机译：研究了软X射线瞬变（SXT）和微准星XTE J1550-564在爆发过程中的时间和光谱特性，强调了非常规恒星方面（美国）实验的观察结果。美国数据显示，低频准周期振荡（LFQPO）的质心频率随着磁通量的增加而趋于增加，并且均方根振幅与美国硬度比相关。在发现LFQPO减弱或根本无法检测到的期间，RXTE检测到几个高频准周期振荡（HFQPO）。研究了美国硬度比随时间和源通量的变化。硬度-强度图显示了逆时针的周期性演变，并可能表明存在两个独立的吸积流：几何上薄，光学上较厚的吸积盘和热的子基普勒流。提出了在XTE J1550-564中生产LFQPO的模型，假设LFQPO是热的子基普勒斯过渡层（TL）中声振荡的结果。在该声振荡模型（AOM）下，TL是在R TL 具有外边界的声腔，其中R TL ＆ap; R inner ，其中R inner 是吸积盘内边缘的半径。 TL共振被解释为LFQPO的机制，本征频率与LFQPO频率ν LFQPO 相关。这种LFQPO机制需要存在一个能够逆康普顿散射的TL，并且该RTL由凉爽的Keplerian吸积盘调节。 LFQPO百分比均方根振幅与USA硬度比的相关性以及在美国，RXTE和BATSE观测中发现的其他相关性和反相关性为AOM提供了支持。 LFQPO数据显示，随着高能量通量的增加，均方根幅度也增加；随着低能量通量的增加，ν LFQPO 也随之增加。这些观察结果表明ν LFQPO 由吸积盘的内边缘设置。光谱推断的R inner 是相称的，随着ν LFQPO 的增加而减小。最后，RXTE频谱数据表明，仅当幂律贡献大于低能量通量的20％时，才能检测到LFQPO，这提供了LFQPO机制取决于TL的证据。 AOM与以上所有观察结果一致，并且能够预测R inner 的近似值。光谱测定的R inner 与RTL的AOM测量结果之间的比较显示出良好的一致性。

著录项

  • 作者

    Reilly, Kaice Theodore.;

  • 作者单位

    Stanford University.;

  • 授予单位 Stanford University.;
  • 学科 Physics Astronomy and Astrophysics.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 181 p.
  • 总页数 181
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;
  • 关键词

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