@article{50d5447172a64f02a7fea4ba7db5faff,
title = "Characterization and photometric performance of the Hyper Suprime-Cam Software Pipeline",
abstract = "The Subaru Strategic Program (SSP) is an ambitious multi-band survey using the Hyper Suprime-Cam (HSC) on the Subaru telescope. The Wide layer of the SSP is both wide and deep, reaching a detection limit of i ∼ 26.0mag. At these depths, it is challenging to achieve accurate, unbiased, and consistent photometry across all five bands. The HSC data are reduced using a pipeline that builds on the prototype pipeline for the Large Synoptic Survey Telescope. We have developed a Python-based, flexible framework to inject synthetic galaxies into real HSC images, called SynPipe. Here we explain the design and implementation of SynPipe and generate a sample of synthetic galaxies to examine the photometric performance of the HSC pipeline. For stars, we achieve 1% photometric precision at i ∼ 19.0mag and 6% precision at i ∼ 25.0 in the i band (corresponding to statistical scatters of ∼0.01 and ∼0.06mag respectively). For synthetic galaxies with single-Sersic profiles, forced CModel photometry achieves 13% photometric precision at i ∼ 20.0mag and 18% precision at i ∼ 25.0 in the i band (corresponding to statistical scatters of ∼0.15 and ∼0.22mag respectively). We show that both forced point spread function and CModel photometry yield unbiased color estimates that are robust to seeing conditions.We identify several caveats that apply to the version of HSC pipeline used for the first public HSC data release (DR1) that need to be taking into consideration. First, the degree to which an object is blended with other objects impacts the overall photometric performance. This is especially true for point sources. Highly blended objects tend to have larger photometric uncertainties, systematically underestimated fluxes, and slightly biased colors. Secondly, >20% of stars at 22.5 < i < 25.0mag can be misclassified as extended objects. Thirdly, the current CModel algorithm tends to strongly underestimate the half-light radius and ellipticity of galaxy with i > 21.5mag.",
keywords = "Methods, Observational-surveys-techniques, Photometric",
author = "Song Huang and Alexie Leauthaud and Ryoma Murata and James Bosch and Paul Price and Robert Lupton and Rachel Mandelbaum and Claire Lackner and Steven Bickerton and Satoshi Miyazaki and Jean Coupon and Masayuki Tanaka",
note = "Funding Information: This work is in part supported by JSPS KAKENHI (Grant Number 26800093, 15H03654, and JP17H01131) as well as a MEXT Grant-in-Aid for Scientific Research on Innovative Areas (Nos. 15H05887, 15H05892, 15H05893, 15K21733). RM is supported by the US Department of Energy Early Career Award Program. RyM is financially supported by the University of Tokyo-Princeton strategic partnership grant and Advanced Leading Graduate Course for Photon Science (ALPS). Funding Information: The Hyper Suprime-Cam (HSC) collaboration includes the astronomical communities of Japan and Taiwan, and Princeton University. The HSC instrumentation and software were developed by the National Astronomical Observatory of Japan (NAOJ), Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), University of Tokyo, High Energy Accelerator Research Organization (KEK) in Japan, Academia Sinica Institute for Astronomy and Astrophysics (ASIAA) in Taiwan, and Princeton University in the United States. Funding was contributed by the FIRST program from Japanese Cabinet Office; Ministry of Education, Culture, Sports, Science and Technology (MEXT); Japan Society for the Promotion of Science (JSPS); Japan Science and Technology Agency (JST); Toray Science Foundation; NAOJ; Kavli IPMU; KEK; ASIAA; and Princeton University. Funding Information: Pan-STARRS1 Surveys (PS1) have been made possible through contributions of Institute for Astronomy, University of Hawaii, Pan-STARRS Project Office, Max-Planck Society and its participating institutes (Max Planck Institute for Astronomy, Heidelberg, and Max Planck Institute for Extraterrestrial Physics, Garching), Johns Hopkins University, Durham University, University of Edinburgh, Queen{\textquoteright}s University Belfast, Harvard-Smithsonian Center for Astrophysics, Las Cumbres Observatory Global Telescope Network Incorporated, National Central University of Taiwan, Space Telescope Science Institute, National Aeronautics and Space Administration under Grant No. NNX08AR22G issued through Planetary Science Division of NASA Science Mission Directorate, National Science Foundation under Grant No. AST-1238877, University of Maryland, E{\"o}tv{\"o}s Lorand University (ELTE), and Los Alamos National Laboratory. Publisher Copyright: {\textcopyright} The Author(s) 2017. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved.",
year = "2018",
month = jan,
day = "1",
doi = "10.1093/pasj/psx126",
language = "English (US)",
volume = "70",
journal = "Publications of the Astronomical Society of Japan",
issn = "0004-6264",
publisher = "Astronomical Society of Japan",
number = "Special Issue 1",
}