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Restoring the Suzaku source position accuracy and point-spread function

机译：恢复朱雀源的位置精度和点扩展功能

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摘要

We present an empirical correction of sky coordinates of X-ray photons obtained with the X-ray Imaging Spectrometer (XIS) aboard the Suzaku satellite to improve the source position accuracy and restore the point-spread function (PSF). The XIS images are known to have an uncertainty in position of up to V, and to show considerable degradations of the PSE These problems are caused by a drifting of the satellite attitude due to thermal distortion of the side panel #7, where the attitude control system is mounted. We found that the position error averaged over a pointing observation can be largely reduced by using the relation between the deviation of the source position in the DETX direction and the ecliptic latitude of the pointing target. We parameterized the wobbling of the source position synchronized with the 96-minute satellite orbital period with temperatures of onboard radiators and elapsed time since the night-day transition of the spacecraft. We developed software, aeattcor, to correct the image drift using these parameters, and applied it to 27 point-source images taken in the Suzaku initial science-operation phase. We show that the radius of the 90% error circle of the source position was reduced to 19 '' and the PSF was sharpened. These improvements have enhanced the scientific capability of the Suzaku XIS.
机译：我们提出了朱雀卫星上用X射线成像光谱仪（XIS）获得的X射线光子的天空坐标的经验校正，以提高源位置精度并恢复点扩展功能（PSF）。众所周知，XIS图像的位置不确定性最高可达V，并且显示出PSE的显着降低。这些问题是由于由于侧板＃7的热变形而导致卫星姿态发生漂移而引起的，其中，姿态控制系统已安装。我们发现，通过使用源位置在DETX方向上的偏差与指向目标的黄纬度之间的关系，可以大大减少在指向观察上平均的位置误差。我们将源位置的摆动参数设置为与96分钟的卫星轨道周期同步，该周期与机载辐射器的温度和自航天器从昼夜过渡以来的经过时间有关。我们开发了aeattcor软件，以使用这些参数校正图像漂移，并将其应用于在朱雀最初的科学操作阶段拍摄的27个点源图像。我们显示源位置的90％误差圆的半径减小到19英寸，并且PSF锐化。这些改进增强了朱雀XIS的科学能力。

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