Gaia DR3测光数据与BP/RP光谱已被广泛用作测光校准的参考。在本研究中，我们通过将BP、RP和G波段测光结果与由BP/RP光谱合成的对应波段测光结果进行比对，检验了Gaia DR3测光与BP/RP光谱的空间均匀性。比对偏差的离散度较小，BP、RP和G波段分别为1.07、0.55和1.02毫星等（mmag）。但偏差呈现出明显的空间模式，且与Gaia的扫描定律明确相关。BP和G波段观测到的模式相似，与RP波段相比，这两个波段的测光与光谱偏差更为显著。利用暗能量巡天（Dark Energy Survey）DR2测光数据开展的进一步独立测试显示，这些空间模式更可能归因于Gaia DR3的BP/RP光谱，尤其是BP波段。一方面，我们的结果证实了Gaia数据在毫星等水平上具有高空间均匀性；另一方面，结果表明Gaia DR3 BP/RP光谱的空间均匀性不及Gaia DR3测光数据，未来可进一步改进。
英文摘要：
Gaia DR3 photometry and BP/RP spectra have been widely used as reference in photometric calibrations. In this work, we check the spatial uniformity of Gaia DR3 photometry and BP/RP spectra by comparing the BP, RP and G bands photometry with the synthetic ones from the BP/RP spectra. The discrepancies have a small dispersion of 1.07, 0.55 and 1.02 mmag for the BP, RP, and G bands, respectively. However, the discrepancies exhibit obvious spatial patterns, which are clearly associated with the Gaia's scanning law. The patterns observed in the BP and G bands are similar, with discrepancies between photometry and spectra being more pronounced in these bands compared to the RP band. A further independent test with the Dark Energy Survey DR2 photometry reveals that the spatial patterns are more likely attributed to the Gaia DR3 BP/RP spectra, particularly in the BP band. On one hand, our results confirm the high spatial uniformity of Gaia data at the mmag level. On the other hand, our results suggest that the spatial uniformity of Gaia DR3 BP/RP spectra is not as good as that of Gaia DR3 photometry, and could be further improved in the future.
QLP Data Release Notes 004: TESS-Gaia Light Curve Photometry Implementation
MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology（麻省理工学院卡弗里天体物理与空间研究所）；Department of Physics & Astronomy, The University of California, Irvine（加州大学尔湾分校物理与天文学系）
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
Performance analysis of extragalactic classifications in Gaia Data Release 4
Max-Planck Institute für Astronomy（马克斯·普朗克天文学研究所）；Dpto. de Matemática Aplicada y Ciencias de la Computación, Univ. de Cantabria（坎塔布里亚大学应用数学与计算机科学系）；Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange（蔚蓝海岸大学、蔚蓝海岸天文台、法国国家科学研究中心、拉格朗日实验室）
