昴星团战略计划超广角主焦点相机第二次数据发布
摘要
本文介绍了超广角主焦点相机昴星团战略计划（Hyper Suprime-Cam Subaru Strategic Program）的第二次数据发布，该计划是在 8.2 米昴星团望远镜上开展的大视场光学成像巡天。本次发布包含截至 2018 年 1 月、共 174 个观测夜晚的数据。Wide 层数据在所有五个宽带滤光片（grizy）下覆盖约 300 deg^2，达到标称巡天曝光时间（gr 波段 10 分钟，izy 波段 20 分钟）。部分观测区域也包含在发布中；约 1100 deg^2 至少在 one 滤光片和一次曝光下被观测。i 波段的中值视宁度为 0.6 arcsec，展示了巡天卓越的成像质量。Deep（26 deg^2）和 UltraDeep（4 deg^2）数据被联合处理，UltraDeep-COSMOS 场对点源在 5 sigma 下达到前所未有的 i~28 深度。除宽带外，Deep 和 UltraDeep 场还提供窄带数据。本次发布包含处理流水线的重大更新，包括改进的天空背景扣除、PSF 建模、目标检测和伪影剔除。整体数据质量有所提升，但本次发布并非没有问题；存在持续的 deblender 问题以及亮星周围掩膜的新问题。鼓励用户在使用数据进行科学探索前查阅问题列表。所有图像产品和目录产品均可下载。目录也已载入数据库，为用户检索感兴趣目标的数据提供便捷接口。除这些主要数据产品外，公开数据发布 1（PDR1）中未提供的详细星系形状测量现在向社区开放。形状目录取自 S16A 内部发布，其面积大于 PDR1（160 deg^2）。所有产品可在数据发布站点 https://hsc-release.mtk.nao.ac.jp/ 获取。
引用
@article{arxiv.1905.12221,
title = {Second Data Release of the Hyper Suprime-Cam Subaru Strategic Program},
author = {Hiroaki Aihara and Yusra AlSayyad and Makoto Ando and Robert Armstrong and James Bosch and Eiichi Egami and Hisanori Furusawa and Junko Furusawa and Andy Goulding and Yuichi Harikane and Chiaki Hikage and Paul T. P. Ho and Bau-Ching Hsieh and Song Huang and Hiroyuki Ikeda and Masatoshi Imanishi and Kei Ito and Ikuru Iwata and Anton T. Jaelani and Ryota Kakuma and Kojiro Kawana and Satoshi Kikuta and Umi Kobayashi and Michitaro Koike and Yutaka Komiyama and Xiangchong Li and Yongming Liang and Yen-Ting Lin and Wentao Luo and Robert Lupton and Nate B. Lust and Lauren A. MacArthur and Yoshiki Matsuoka and Sogo Mineo and Hironao Miyatake and Satoshi Miyazaki and Surhud More and Ryoma Murata and Shigeru V. Namiki and Atsushi J. Nishizawa and Masamune Oguri and Nobuhiro Okabe and Sakurako Okamoto and Yuki Okura and Yoshiaki Ono and Masato Onodera and Masafusa Onoue and Ken Osato and Masami Ouchi and Takatoshi Shibuya and Michael A. Strauss and Naoshi Sugiyama and Yasushi Suto and Masahiro Takada and Yuhei Takagi and Tadafumi Takata and Satoshi Takita and Masayuki Tanaka and Tsuyoshi Terai and Yoshiki Toba and Hisakazu Uchiyama and Yousuke Utsumi and Shiang-Yu Wang and Wenting Wang and Yoshihiko Yamada},
journal= {arXiv preprint arXiv:1905.12221},
year = {2019}
}
备注
26 pages, 23 figures, accepted for publication in PASJ. Data available at https://hsc-release.mtk.nao.ac.jp/