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Issue created 8 months ago by Zhang Tianmeng@zhangtianmengDeveloper
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C9.3仿真数据星系多波段图像缺陷

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C9.3仿真数据星系多波段图像缺陷

我在使用C9.2仿真数据W5天区处理的1级图像进行彩图合并时候,发现一个奇怪的现象。如下图所示,彩图中出现了一个蓝色的椭圆星系。因为彩图是使用g, r, i三个波段合成的。所以应该是该星系只出现在了g波段。

W5_color_1

我用ds9打开了7个波段的mosaic图像,证实确实是只有nuv,u,g三个波段出现了该星系(见下图),星系坐标RA = 300.1267838, Dec = -59.9473413

w5_multiband_2

这样的情况还多次出现,包括截止到r波段形成的绿色星系(见下图)

w5_multiband_1

个人猜测这是因为星系在红端亮于设置的饱和星等造成的(因为星系是展源,其实并没有饱和)

建议在完成此修正之前,不要跑1000平方度 @weichengliang

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  • Zhang Tianmeng @zhangtianmeng assigned to @luochangqing 8 months ago

    assigned to @luochangqing

  • Fang Yuedong
    Fang Yuedong @fangyuedong · 8 months ago
    Maintainer

    在更新C9星表时,因直接使用输入星表中已提前计算的CSST星等进行提速,C9_Catalog.py程序返回的用于normalize的滤光片效率被设置为None, 导致计算饱和星等的函数总是返回当前band对应的饱和星等,进一步导致程序并未按事先约定好的以某一特定band(C9 默认为z band)的星等及饱和星等为基准来对星表里的目标源进行亮度筛选。 此问题已在commit: 7465f1d8 中进行了修复。以下为本issue中提到的目标源18326900288500000029在r band里的图像: Screenshot_2024-12-06_at_2.36.24_PM

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