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arXiv 0810.1141astro-ph
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SWIFT J1753 .5-0127的多波长光谱和高时间分辨率观测:新活动?

Multiwavelength spectral and high time resolution observations of SWIFT J1753.5-0127: new activity?

M. Durant, P. Gandhi, T. Shahbaz, H. H. Peralta, V. S. Dhillon

摘要:

在2005年的明亮爆发事件之后,我们在2007年6月对SWIFT J1753.5-0127进行了广泛的观测活动。我们已经进行了多波段光度学,光谱学,X射线光谱学和定时和ULTRACAM光度学同时在三个波段。光谱和X射线光谱以及宽波段光度测定中亮度的增强都表明最近活动增加。我们分析了不同的光谱区域,发现一个平滑的光学连续谱,明显缺乏线条和一个非常蓝色的组件调制周期为3.2小时和硬幂律X射线光谱。X射线和光学功率谱在低频率下直到0.1 Hz(10 s)范围内都是平坦的,然后大致按照与闪烁一致的幂律下降。此外,光学数据显示在0.08 Hz(13 s)附近的准周期振荡(QPO)。结合光变曲线的动力学和自相关分析,我们试图构建一个完整的物理图像,这个有趣的系统。

英文摘要:

We have conducted an extensive observational campaign of SWIFT J1753.5-0127 during June 2007 after its bright outburst episode in 2005. We have performed multi-band optical photometry, optical spectroscopy, X-ray spectroscopy and timing and ULTRACAM optical photometry simultaneously in three bands. Both the optical spectrum and the X-ray spectrum, along with enhanced brightness in broad-band photometry point to recent increased activity. We analyze the different spectral regions, finding a smooth optical continuum with a remarkable lack of lines and a very blue component modulated with a period of 3.2hr and a hard power-law X-ray spectrum. Both the X-ray and optical power spectra are flat at low frequencies up to the 0.1 Hz (10 s) range, then decreasing roughly as a power law consistent with flickering. Furthermore, the optical data show quasi-periodic oscillations (QPOs) near 0.08 Hz (13 s). Together with a dynamical and auto-correlation analysis of the light curves we attempt to construct a complete physical picture of this intriguing system.

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