arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2408.12929astro-ph.IM
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CSST主巡天相机的速度像差效应

The Velocity Aberration Effect of the CSST Main Survey Camera

Hui-Mei Feng, Zi-Huang Cao, Man I Lam, Ran Li, Hao Tian, Xin Zhang, Peng Wei, Xin-Feng Li, Wei Wang, Hugh R. A. Jones, Mao-Yuan Liu, Chao Liu

AI总结:

本研究模拟了CSST主巡天相机因运动产生的速度像差效应,发现其导致焦面像素比例尺呈正弦变化,在低黄纬视场边缘引起0.94像素(20分钟曝光)或0.26像素(300秒曝光)偏移,并提出了观测前后的几何效应处理方法。

摘要:

在本研究中,我们进行了模拟,以找出由于运动导致的Chinese Space Station Telescope (CSST)的Main Survey Camera (MSC)所拍摄图像的预期几何像差。正如先前工作所预期的,我们的发现表明,光的几何畸变会影响焦面的视在比例尺,并且随着焦面尺寸的增加,这种影响变得更加显著。我们的模型表明,该效应在垂直和平行方向上始终影响像素比例尺。在一个轨道周期内,视在比例尺变化呈正弦分布。模拟显示,该效应在银河系中心尤为显著,并沿黄纬方向逐渐减弱。在低黄纬处,视场边缘的总像差分别导致约0.94像素的偏移(20分钟曝光)和0.26像素的偏移(300秒曝光)。我们提出了在CSST观测前后阶段对几何效应的适当处理方法。

英文摘要:

In this study, we conducted simulations to find the geometric aberrations expected for images taken by the Main Survey Camera (MSC) of the Chinese Space Station Telescope (CSST) due to its motion. As anticipated by previous work, our findings indicate that the geometric distortion of light impacts the focal plane's apparent scale, with a more pronounced influence as the size of the focal plane increases. Our models suggest that the effect consistently influences the pixel scale in both the vertical and parallel directions. The apparent scale variation follows a sinusoidal distribution throughout one orbit period. Simulations reveal that the effect is particularly pronounced in the center of the Galaxy and gradually diminishes along the direction of ecliptic latitude. At low ecliptic latitudes, the total aberration leads to about 0.94 pixels offset (a 20-minute exposure) and 0.26 pixels offset (a 300-second exposure) at the edge of the field of view, respectively. Appropriate processings for the geometric effect during the CSST pre- and post-observation phases are presented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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