CHORUS. I. Cosmic HydrOgen Reionization Unveiled with Subaru: Overview
CHORUS. I. Cosmic HydrOgen Reionization Unveiled with Subaru: Overview
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DOI：
10.1093/pasj/psaa100
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发表时间：
2020-11
影响因子：
2.3
通讯作者：
A. Inoue;Satoshi Yamanaka;M. Ouchi;I. Iwata;K. Shimasaku;Y. Taniguchi;T. Nagao;N. Kashikawa;
中科院分区：
文献类型：
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作者：
A. Inoue;Satoshi Yamanaka;M. Ouchi;I. Iwata;K. Shimasaku;Y. Taniguchi;T. Nagao;N. Kashikawa;
为了确定宇宙再电离的主要来源，全球电离分数的演变历史，以及电离区域的拓扑结构，我们已经进行了深入的成像调查，使用四个窄带（NB）和一个中频（IB）过滤器的斯巴鲁/超超级凸轮（HSC），称为宇宙氢再电离揭开斯巴鲁（合唱）。CHORUS滤波器的中心波长和半高全宽分别为：NB 387为386.2 nm和5.5 nm，NB 527为526.0 nm和7.9 nm，NB 718为717.1 nm和11.1 nm，IB 945为946.2 nm和33.0 nm，NB 973为971.2 nm和11.2 nm。这种组合，包括斯巴鲁战略计划与HSC（HSC SSP）的NB 921（921.5 nm和13.5 nm），经过精心设计，就像他们在演奏合唱，同时观察多个光谱特征，如莱曼连续谱，Lyα，C iv和He ii，$z$ = 2-7。观测场与COSMOS场中HSC SSP的最深足迹相同，其有效面积约为1.6 ° 2。我们介绍了CHORUS项目的概述，其中包括滤波器设计理念的描述，观测和数据简化，多波段光度计目录，成像质量评估，数量计数测量以及数据的示例用例。所有的成像数据，光度表，掩蔽像素图像，数据的限制幅度和点扩散函数，完整性模拟的结果，和源数量计数是公开的，通过HSC SSP数据库。
To determine the dominant sources for cosmic reionization, the evolution history of the global ionizing fraction, and the topology of the ionized regions, we have conducted a deep imaging survey using four narrow-band (NB) and one intermediate-band (IB) filters on the Subaru/Hyper Suprime-Cam (HSC), called Cosmic HydrOgen Reionization Unveiled with Subaru (CHORUS). The central wavelengths and full-widths-at-half-maximum of the CHORUS filters are, respectively, 386.2 nm and 5.5 nm for NB387, 526.0 nm and 7.9 nm for NB527, 717.1 nm and 11.1 nm for NB718, 946.2 nm and 33.0 nm for IB945, and 971.2 nm and 11.2 nm for NB973. This combination, including NB921 (921.5 nm and 13.5 nm) from the Subaru Strategic Program with HSC (HSC SSP), is carefully designed, as if they were playing a chorus, to observe multiple spectral features simultaneously, such as Lyman continuum, Lyα, C iv, and He ii for $z$ = 2–7. The observing field is the same as that of the deepest footprint of the HSC SSP in the COSMOS field and its effective area is about 1.6 deg2. We present an overview of the CHORUS project, which includes descriptions of the filter design philosophy, observations and data reduction, multiband photometric catalogs, assessments of the imaging quality, measurements of the number counts, and example use cases for the data. All the imaging data, photometric catalogs, masked pixel images, data of limiting magnitudes and point spread functions, results of completeness simulations, and source number counts are publicly available through the HSC SSP database.