Mamoru Doi, Masayuki Tanaka, Masataka Fukugita, James E. Gunn, Naoki Yasuda, Zeljko Ivezic, Jon Brinkmann, Ernst de Haars, Scott J. Kleinman, Jurek Krzesinski, R. French Leger
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54 pages, 18 figures, 7 tables, accepted for publication in AJ
The monochromatic illumination system is constructed to carry out in situ measurements of the response function of the mosaicked CCD imager used in the Sloan Digital Sky Survey (SDSS). The system is outlined and the results of the measurements, mostly during the first 6 years of the SDSS, are described. We present the reference response functions for the five colour passbands derived from these measurements, and discuss column to column variations and variations in time, and also their effects on photometry. We also discuss the effect arising from various, slightly different response functions of the associated detector systems that were used to give SDSS photometry. We show that the calibration procedures of SDSS remove these variations reasonably well with the resulting final errors from variant response functions being unlikely to be larger than 0.01 mag for g, r, i, and z bands over the entire duration of the survey. The considerable aging effect is uncovered in the u band, the response function showing a 30% decrease in the throughput in the short wavelength side during the survey years, which potentially causes a systematic error in photometry. The aging effect is consistent with variation of the instrumental sensitivity in u-band, which is calibrated out. The expected colour variation is consistent with measured colour variation in the catalog of repeated photometry. The colour variation is delta (u-g) ~ 0.01 for most stars, and at most delta (u-g) ~ 0.02 mag for those with extreme colours. We verified in the final catalogue that no systematic variations in excess of 0.01 mag are detected in the photometry which can be ascribed to aging and/or seasonal effects except for the secular u-g colour variation for stars with extreme colours.
Photometric Cross-Calibration of the SDSS Stripe 82 Standard Stars catalogue with Gaia EDR3, and Comparison with Pan-STARRS1, DES, CFIS and GALEX catalogues
我们用2007年后的SDSS成像数据扩展了SDSS Stripe 82标准星表。这个改进的版本列出了近100万颗比r~22等亮的恒星的平均SDSS ugriz测光。每颗恒星的测量值增加了2- 3倍，随机误差比原始星表小1.4- 1.7倍，比单个SDSS运行小约3倍。在新星表中，u、g、r、i和z波段亮度分别超过20.0、21.0、21.0、20.5和19.0等的恒星的随机误差< 0.01等。我们通过使用盖亚早期数据发布3（EDR 3）Gmag测光来获得灰度测光零点校正，作为R.A.和December，用于SDSS目录，并使用Gaia BP-RP颜色来导出ugiz波段相对于r波段的校正。经Pan-STARRS 1、DES、CFIS和GALEX巡天测试的重新校准的测光质量表明，测光零点的空间变化<=0.01 mag（RMS），在R.A.的典型值为3-7毫等，而在十倍方向上为1-2毫等，除了在u波段中<6毫等的散射。我们还报告了一些小的测光问题与其他调查考虑在这里，包括一个依赖于星等的~0.01 mag之间的偏差16 < G_盖亚< 20在盖亚EDR 3。我们新的公开目录提供了低于1%水平的ugriz测光的强大校准，并将在Vera C的调试期间提供帮助。Rubin Observatory Legacy Survey of Space and Time的照片
Photometric recalibration of the SDSS Stripe 82 to a few milimagnitude precision with the stellar color regression method and Gaia EDR3
通过结合LAMOST DR 7、SDSS DR 12的光谱数据和Gaia EDR 3的校正光度数据，我们应用恒星颜色回归（SCR; Yuan et al. 2015 a）方法重新校准了Ivezić et al.（2007）的SDSS Stripe 82标准星表。在总共约30，000颗光谱目标恒星的情况下，我们绘制出了星表中存在的相对较大和强相关的光度零点误差，在$u$波段中$\sim$为2.5%，在$griz$波段中$\sim$为1%。我们的研究还证实了一些小的，但重要的幅度依赖性的错误，在$z$带的一些电荷耦合器件。各种测试表明，我们已经实现了在$u$频带中约5 mmag和在$griz$频带中约2 mmag的内部精度，这比以前的结果好约5倍。我们还将该方法应用于最新版本的星表（V4.2; Thanjavur et al. 2021），并发现沿着R. A的适度系统校准误差高达$\sim$ 1%。方向和较小的误差沿十二月方向。结果表明，SCR方法的功率时，结合光谱数据和盖亚光度测量在突破1%的精度障碍的地面光度测量。我们的工作为整个SDSS光度测量的重新校准铺平了道路，并对未来测量的校准具有重要意义。最后讨论了SCR方法在不同情况下的应用和改进。
An optimised survey strategy for the ERIS/NIX imager: searching for young giant exoplanets and very low mass brown dwarfs using the K-peak custom photometric filter
Recalibration of SDSS photometric zero-points based on the InfraRed Flux Method temperature scale
Yunnan Astronomical Observatories, Chinese Academy of Sciences（中国科学院云南天文台）；Research School of Astronomy and Astrophysics, Australian National University（澳大利亚国立大学天体物理与天文研究学院）；International Centre of Supernovae, Yunnan Key Laboratory（超新星国际中心，云南省重点实验室）；University of Chinese Academy of Sciences（中国科学院大学）；Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences（中国科学院天体结构与演化重点实验室）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）
