恢复朱雀源的位置精度和点扩散函数
Restoring the Suzaku Source Position Accuracy and Point-Spread Function
摘要：
为了提高源位置精度和恢复点扩散函数（PSF），对朱雀星上XIS获得的X射线光子的天空坐标进行了经验修正。已知XIS图像的位置不确定性高达1弧分，并且显示出PSF的相当大的退化。这些问题是由安装姿态控制系统的侧板7的热变形引起的卫星姿态漂移引起的。我们发现，通过使用在DETX方向上的源位置的偏差和指向目标的黄道纬度之间的关系，可以大大减小在指向观测上平均的位置误差。我们参数化的源位置的摆动同步与卫星轨道周期与板载散热器的温度和经过的时间，因为昼夜过渡的航天器。我们开发了软件aeattcor，使用这些参数来校正图像漂移，并将其应用于27个点源图像。我们表明，源位置的90%误差圆的半径减小到19弧秒，PSF锐化。这些改进增强了朱雀XIS的科学能力。
英文摘要：
We present an empirical correction of sky coordinates of X-ray photons obtained with the 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 1 arcmin, and to show considerable degradations of the PSF. 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 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. We show that the radius of the 90% error circle of the source position was reduced to 19 arcsec and the PSF was sharpened. These improvements have enhanced the scientific capability of the Suzaku XIS.
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