Effect of soft flares on XMM-Newton EPIC-pn timing mode data
Effect of soft flares on XMM-Newton EPIC-pn timing mode data
复制标题
软耀斑对 XMM-Newton EPIC-pn 定时模式数据的影响
DOI：
10.1117/12.506363
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
M. Kirsch
中科院分区：
文献类型：
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作者：
V. Burwitz;F. Haberl;M. Freyberg;K. Dennerl;E. Kendziorra;M. Kirsch
欧空局X射线天文台XMM-牛顿上的EPIC-pn CCD照相机是一种非常灵敏和多功能的仪器，具有多种观测模式。其中一种模式，即定时模式，被设计为可以实现0.029毫秒的时间分辨率。这种模式对于以非常高的时间分辨率观测明亮的可变源是重要的。到目前为止，在这种模式下只能使用低至300-400 eV的光谱。低于这个能量，数据似乎受到软耀斑的影响，软耀斑是由高能粒子产生的堆栈溢出造成的。我们提出了一种方法，可以用来减轻这些耀斑对数据的影响，并讨论了改进，这带来的定时模式谱。这种新的方法将最终有可能得到光谱下降到最低的能量可检测的这种模式。这对于孤立的中子星和其他可变物体的计时研究特别有趣，例如磁性CV，具有非常软的光谱。
The EPIC-pn CCD Camera on board the ESA X-ray observatory XMM-Newton is a very sensitive and versatile instrument with many observing modes. One of the modes, the timing mode, was designed so that a time resolution of 0.029 milliseconds can be achieved. This mode is important for observing bright variable sources with a very high time resolution. Up to now it has only been possible to use the spectra down to 300-400 eV in this mode. Below this energy the data appears to be affected by soft flares which are caused by stack overflows generated by high energy particles. We present a method that can be used to mitigate the effect these flares have on the data and discuss the improvement that this brings to the timing mode spectra. This new method will at last make it possible to get spectra down to the lowest energies detectable in this mode. This is particularly interesting for timing studies of isolated neutron stars and other variable objects, such as magnetic CVs, with very soft spectra.