The Cosmic Evolution Survey (COSMOS): Subaru Observations of the HST Cosmos Field

We present deep optical imaging observations of 2 square degree area, covered by the Cosmic Evolution Survey (COSMOS), made by the prime-focus camera (Supreme-Cam) on the 8.2 m Subaru Telescope. Observations were done in six broadband [ B (4459.7 Å), g ' (4723.1 Å), V (5483.8 Å), r ' (6213.0 Å), i ' (7640.8 Å), z ' (8855.0 Å)] and one narrowband (NB816) filters. A total of 10 6 galaxies were detected to i ' ~ 26.5 mag. These data, combined with observations at u * and K -band are used to construct the photometric catalogs for the COSMOS, to measure their photometric redshifts, multiband spectral energy distributions, and stellar masses, and to identify high-redshift candidates. This catalog provides multi-wave band data for scientific analysis of the COSMOS survey.