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U 波段数据测试

U 波段数据测试. 邹虎 2012. 8. 总星表 ( 选择无污染的恒星源 ). SCUSS Psf 星等 - sdss psf 星等比较. 选取 psf 和 sdss 测光误差小于 0.02 的点源. Bertin 星等 - sdss 星等随星等的变化. 选取 bertin 和 sdss 测光误差小于 0.02 的点源 Bertin 的弥散比 psf 要小. Robust linear fit u scuss -u sdss = -0.146144 + 0.00746879* u sdss 系数误差： 0.00147944 8.56115e-05.

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U 波段数据测试

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  1. U波段数据测试 邹虎 2012.8

  2. 总星表(选择无污染的恒星源)

  3. SCUSSPsf星等-sdsspsf星等比较 • 选取psf和sdss测光误差小于0.02的点源

  4. Bertin星等-sdss星等随星等的变化 • 选取bertin和sdss测光误差小于0.02的点源 • Bertin的弥散比psf要小 Robust linear fit uscuss-usdss= -0.146144 + 0.00746879*usdss 系数误差：0.00147944 8.56115e-05

  5. 定标颜色项(不消除梯度) • 取bertin和sdss测光误差小于0.02的所有点源 Robust poly fit uscuss-usdss= 0.0443534- 0.0806870*(usdss-g) + 0.0249528*(usdss-g)2 (适用于0.8<u-g<2.8) 系数误差：0.000722890 0.000894228 0.000267049

  6. 定标颜色项(消除梯度) 去梯度 uscuss= (uscuss+0.146144)/ (1+ 0.00746879) Robust poly fit uscuss-usdss= 0.0548322 - 0.0715310*(usdss-g) + 0.0220192*(usdss-g)2 (适用于0.8<u-g<2.8) 系数误差：0.000697088 0.000862656 0.000257962

  7. 类星体

  8. 星等差随星等的变化 取sdss和scuss测光误差都小于0.05的qso 均值：0.017646647 均方差：0.36703353 与sdss的星等差弥散很大

  9. 类星体模板– 星等差与星等关系模板：不同红移、不同连续谱、不同发射线总等值宽度 • http://www.sc.eso.org/~asmette/gaia/ 透过率曲线 虚线：scuss，实线sdss 归一化

  10. 模板星等差-红移关系

  11. 实测星等差-红移关系

  12. 类星体光谱卷积 • 随机下载了大约4000个sdss类星体的光谱，将它们整体蓝移0.3，使得sdss的光谱可以卷积bok u和sdss u的滤光片

  13. Scuss与sdss之间星等差随红移的变化

  14. 测光实测和光谱测量对比 实测类星星等差随红移的变化，变化幅度远远超出了由于滤光片不同而带来的星等变化

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