CHORUS. I. Cosmic HydrOgen Reionization Unveiled with Subaru: Overview
Akio K. Inoue (Waseda), Satoshi Yamanaka (Waseda), Masami Ouchi, Ikuru, Iwata, Kazuhiro Shimasaku, Yoshiaki Taniguchi, Tohru Nagao, Nobunari, Kashikawa, Yoshiaki Ono, Ken Mawatari, Takatoshi Shibuya, Masao Hayashi,, Hiroyuki Ikeda, Haibin Zhang, Yongming Liang, C.-H. Lee

TL;DR
The CHORUS project used Subaru's Hyper Suprime-Cam with specialized filters to study cosmic reionization by observing multiple spectral features across a large field, providing valuable data for understanding the early universe.
Contribution
This paper introduces the design, execution, and data release of the CHORUS survey, a novel multi-band imaging campaign targeting cosmic reionization with carefully chosen filters.
Findings
Designed filters to observe multiple spectral features simultaneously.
Collected deep imaging data over 1.6 deg² in the COSMOS field.
Publicly released comprehensive photometric catalogs and data products.
Abstract
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), are carefully designed, as if they were playing a chorus, to observe multiple spectral features simultaneously, such as Lyman continuum, Ly, C~{\sc iv},…
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