期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
卷 70, 期 -, 页码 -出版社
OXFORD UNIV PRESS
DOI: 10.1093/pasj/psx077
关键词
cosmology: observations; galaxies: distances and redshifts; galaxies: general; surveys
资金
- FIRST program from the 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
- Princeton University
- National Aeronautics and Space Administration [NNX08AR22G]
- National Science Foundation [AST-1238877, 2016222625]
- JSPS KAKENHI [JP15K17617]
- MEXT KAKENHI [16H01096]
- U.S. DOE [DE-AC02-05CH11231]
- NSF [PHY-1316783, PHY-1638509]
- JSPS [17K05409, 15H05887]
- WPI, MEXT, Japan
- Grants-in-Aid for Scientific Research [15K17617, 15H05887, 15H05892, 16H01096, 17K05409, 15K21733] Funding Source: KAKEN
Photometric redshifts are a key component of many science objectives in the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP). In this paper, we describe and compare the codes used to compute photometric redshifts for HSC-SSP, how we calibrate them, and the typical accuracy we achieve with the HSC five-band photometry (grizy). We introduce a new point estimator based on an improved loss function and demonstrate that it works better than other commonly used estimators. We find that our photo-z's are most accurate at 0.2 less than or similar to zp(hot) less than or similar to 1.5, where we can straddle the 4000 angstrom break. We achieve sigma[Delta z(phot)/(1 + z(phot))] similar to 0.05 and an outlier rate of about 15% for galaxies down to i = 25 within this redshift range. If we limit ourselves to a brighter sample of i < 24, we achieve s similar to 0.04 and similar to 8% outliers. Our photo-z's should thus enable many science cases for HSC-SSP. We also characterize the accuracy of our redshift probability distribution function (PDF) and discover that some codes over-/underestimate the redshift uncertainties, which has implications for N(z) reconstruction. Our photo-z products for the entire area in Public Data Release 1 are publicly available, and both our catalog products (such as point estimates) and full PDFs can be retrieved from the data release site, < https://hsc-release.mtk.nao.ac.jp/>.
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