论文标题
Skymapper Southern调查：第二个数据发布（DR2）
SkyMapper Southern Survey: Second Data Release (DR2)
论文作者
论文摘要
我们介绍了Skymapper Southern调查的第二个数据发布（DR2），这是一项半球调查，使用六个光学滤镜在澳大利亚的Sidide Spring天文台与Skymapper望远镜进行了：$ U，V，G，G，R，I，Z $。 DR2是第一个超出DR1浅层调查的$ \ sim $ \ sim $ 18mag（10 $σ$）限制的版本，并在全面调查深度上包括一部分天空，以$ g $和$ r $ $ $ $ $ $ $ $ $ $ $ $ $ $。 DR2光度法的精度为$ u $和$ v $ 1％的内部可重复性，而$ griz $中的0.7％。超过21 000摄氏度$^2 $在某些过滤器（在浅层或主要的调查深度）中具有数据，并且超过7000 deg $^2 $在所有六个过滤器中都具有深层的主要调查覆盖范围。最后，大约18 000摄氏度$^2 $在$ i $和$ z $过滤器中具有主要的调查数据，尽管尚未完全深入。该版本包含超过12万张图像，以及超过5亿个独特的天体物理对象和近50亿个个人检测的目录。它还包含一系列外部目录，例如Gaia DR2，Pan-Starrs1 DR1，Galex Guvcat，2 Mass和Allwise，以及光谱调查，例如2MRS，Galah，6DFGS和2Dflens。
We present the second data release (DR2) of the SkyMapper Southern Survey, a hemispheric survey carried out with the SkyMapper Telescope at Siding Spring Observatory in Australia, using six optical filters: $u,v,g,r,i,z$. DR2 is the first release to go beyond the $\sim$18mag (10$σ$) limit of the Shallow Survey released in DR1, and includes portions of the sky at full survey depth that reach >21mag in $g$ and $r$ filters. The DR2 photometry has a precision as measured by internal reproducibility of 1% in $u$ and $v$, and 0.7% in $griz$. More than 21 000 deg$^2$ have data in some filters (at either Shallow or Main Survey depth) and over 7 000 deg$^2$ have deep Main Survey coverage in all six filters. Finally, about 18 000 deg$^2$ have Main Survey data in $i$ and $z$ filters, albeit not yet at full depth. The release contains over 120 000 images, as well as catalogues with over 500 million unique astrophysical objects and nearly 5 billion individual detections. It also contains cross-matches with a range of external catalogues such as Gaia DR2, Pan-STARRS1 DR1, GALEX GUVcat, 2MASS, and AllWISE, as well as spectroscopic surveys such as 2MRS, GALAH, 6dFGS, and 2dFLenS.
