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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Restoring the Suzaku Source Position Accuracy and Point-Spread Function
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Restoring the Suzaku Source Position Accuracy and Point-Spread Function

机译：恢复朱雀源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 ImagingSpectrometer (XIS) aboard the Suzaku satellite to improve the source position accuracy and restore the point-spreadfunction (PSF). The XIS images are known to have an uncertainty in position of up to 1', and to show considerabledegradations of the PSF. These problems are caused by a drifting of the satellite attitude due to thermal distortionof the side panel #7, where the attitude control system is mounted. We found that the position error averaged overa pointing observation can be largely reduced by using the relation between the deviation of the source position inthe DETX direction and the ecliptic latitude of the pointing target. We parameterized the wobbling of the sourceposition synchronized with the 96-minute satellite orbital period with temperatures of onboard radiators and elapsedtime since the night—day transition of the spacecraft. We developed software, aeattcor, to correct the image driftusing 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X射线成像光谱仪（XIS）获得的X射线光子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）。已知XIS图像的位置不确定性高达1'，并且显示出PSF的相当大的退化。这些问题是由于安装了姿态控制系统的侧面板＃7的热变形所导致的卫星姿态的漂移引起的。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道纬度之间的关系，可以大大降低指向观察得到的平均位置误差。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，其中卫星辐射器的温度和自航天器从黑夜到白昼过渡以来的经过时间。我们开发了aeattcor软件来校正使用这些参数的图像漂移，并将其应用于在朱雀科学初期阶段拍摄的27个点源图像中，结果表明源位置的90％误差圆的半径减小了至19“，PSF也得到了提高。这些改进增强了朱雀XIS的科学能力。

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