The Subaru COSMOS 20: Subaru Optical Imaging of the HST COSMOS Field with 20 Filters

TL;DR

This paper details the observational procedures and data reduction methods for a comprehensive optical imaging survey of the HST COSMOS field using 20 Subaru filters, including data accuracy assessments.

Contribution

It provides detailed procedures and calibration results for 13 additional filters in the Subaru COSMOS 20 project, expanding previous work on the survey.

Findings

High photometric accuracy across all filters

Precise astrometry achieved for the survey data

Comprehensive characterization of the IA filter system

Abstract

We present both the observations and the data reduction procedures of the Subaru COSMOS 20 project that is an optical imaging survey of the HST COSMOS field, carried out by using Suprime-Cam on the Subaru Telescope with the following 20 optical filters: 6 broad-band (B, g', V, r', i', and z'), 2 narrow-band (NB711 and NB816), and 12 intermediate-band filters (IA427, IA464, IA484, IA505, IA527, IA574, IA624, IA679, IA709, IA738, IA767, and IA827). A part of this project is described in Taniguchi et al. (2007) and Capak et al. (2007) for the six broad-band and one narrow-band (NB816) filter data. In this paper, we present details of the observations and data reduction for remaining 13 filters (the 12 IA filters and NB711). In particular, we describe the accuracy of both photometry and astrometry in all the filter bands. We also present optical properties of the Suprime-Cam IA filter system in Appendix.