Second data release of the Hyper Suprime-Cam Subaru Strategic Program
Second data release of the Hyper Suprime-Cam Subaru Strategic Program
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DOI：
10.1093/pasj/psz103
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发表时间：
2019-05
影响因子：
2.3
通讯作者：
H. Aihara;Y. AlSayyad;M. Ando;R. Armstrong;J. Bosch;E. Egami;H. Furusawa;J. Furusawa;A. Goulding
中科院分区：
文献类型：
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作者：
H. Aihara;Y. AlSayyad;M. Ando;R. Armstrong;J. Bosch;E. Egami;H. Furusawa;J. Furusawa;A. Goulding
本文介绍了超级超级凸轮斯巴鲁战略计划的第二个数据发布，这是一个使用8.2米斯巴鲁望远镜的宽视场光学成像调查。该发布包括截至2018年1月的174个夜晚的观测数据。宽层数据在所有五个宽带滤波器（$grizy$）中覆盖约300度$^2$到名义调查暴露（$gr$为10分钟，$izy$为20分钟）。部分观察区域也包括在发布中；在至少一个滤镜和一次曝光中观察到约1100度$^2$。在i波段看到的中间值是${0_{.}^{\prime \prime }6}$，显示了该调查的出色图像质量。Deep（26度$^2$）和UltraDeep（4度$^2$）数据被联合处理后，UltraDeep- cosmos场在$5 \, \sigma$点源处达到了前所未有的$i\sim 28$深度。除了宽带数据外，Deep和UltraDeep领域也有窄带数据。此版本包括对处理管道的主要更新，包括改进的天空减法、PSF建模、对象检测和工件抑制。整体数据质量得到了改善，但这个版本也不是没有问题；有一个持续存在的分解问题，以及明亮恒星周围的面具的新问题。鼓励用户在利用数据进行科学探索之前查看问题列表。所有的映像产品和目录产品都可以下载。目录还被加载到数据库中，该数据库为用户检索感兴趣对象的数据提供了一个简单的界面。除了这些主要的数据产品，详细的星系形状测量从公共数据发布1 （PDR1）中保留，现在可以向社区提供。形状目录是从S16A内部释放中绘制的，它的面积比PDR1大（160度$^2$）。所有产品均可在数据发布网站https://hsc-release.mtk.nao.ac.jp/上获得。
This paper presents the second data release of the Hyper Suprime-Cam Subaru Strategic Program, a wide-field optical imaging survey using the 8.2 m Subaru Telescope. The release includes data from 174 nights of observation through 2018 January. The Wide layer data cover about 300 deg$^2$ in all five broad-band filters ($grizy$) to the nominal survey exposure (10 min in $gr$ and 20 min in $izy$). Partially observed areas are also included in the release; about 1100 deg$^2$ is observed in at least one filter and one exposure. The median seeing in the i-band is ${0_{.}^{\prime \prime }6}$, demonstrating the superb image quality of the survey. The Deep (26 deg$^2$) and UltraDeep (4 deg$^2$) data are jointly processed and the UltraDeep-COSMOS field reaches an unprecedented depth of $i\sim 28$ at $5 \, \sigma$ for point sources. In addition to the broad-band data, narrow-band data are also available in the Deep and UltraDeep fields. This release includes a major update to the processing pipeline, including improved sky subtraction, PSF modeling, object detection, and artifact rejection. The overall data quality has been improved, but this release is not without problems; there is a persistent deblender problem as well as new issues with masks around bright stars. The user is encouraged to review the issue list before utilizing the data for scientific explorations. All the image products as well as catalog products are available for download. The catalogs are also loaded into a database, which provides an easy interface for users to retrieve data for objects of interest. In addition to these main data products, detailed galaxy shape measurements withheld from Public Data Release 1 (PDR1) are now available to the community. The shape catalog is drawn from the S16A internal release, which has a larger area than PDR1 (160 deg$^2$). All products are available at the data release site, https://hsc-release.mtk.nao.ac.jp/.