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U 波段数据测试 - PowerPoint PPT Presentation


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

slide5
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

slide6
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

slide8
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

slide9
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

slide12
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
slide14
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