Photometric Redshifts and Stellar Masses for Galaxies from the DESI Legacy Imaging Surveys
文献类型:期刊论文
作者 | Zou,Hu1; Gao,Jinghua1,2; Zhou,Xu1; Kong,Xu3 |
刊名 | The Astrophysical Journal Supplement Series |
出版日期 | 2019-05-21 |
卷号 | 242期号:1 |
ISSN号 | 0067-0049 |
关键词 | galaxies: clusters: general galaxies: distances and redshifts galaxies: photometry |
DOI | 10.3847/1538-4365/ab1847 |
英文摘要 | Abstract We present a catalog of photometric redshifts and stellar masses for galaxies from imaging surveys serving the Dark Energy Spectroscopic Instrument project. The imaging footprints cover an area of over 14,000 deg2. This catalog contains about 0.17 billion morphologically classified galaxies with r?23 mag. It covers the redshift range of z?1 and the mass range of . A total of five photometric bands are used, including three optical filters (g, r, and z) and two infrared filters (Wide-field Infrared Survey Explorer W1 and W2). We use k-nearest neighbors and local linear regression algorithms to estimate photometric redshifts. Based on a spectroscopic sample of about 2.2 million galaxies, we achieve a redshift bias of ?=?2.4?×?10?4, accuracy of ?=?0.017, and outlier rate of about 5.1%. The stellar mass and other physical parameters are derived by stellar population synthesis model fitting based on our photometric redshifts. The differences in derived using spectroscopic and photometric redshifts present a 1σ dispersion of 0.09 dex. |
语种 | 英语 |
出版者 | The American Astronomical Society |
WOS记录号 | IOP:0067-0049-242-1-AB1847 |
源URL | [http://ir.bao.ac.cn/handle/114a11/26337] |
专题 | 中国科学院国家天文台 |
作者单位 | 1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China zouhu@nao.cas.cn 2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China 3.Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei 230026, People's Republic of China |
推荐引用方式 GB/T 7714 | Zou,Hu,Gao,Jinghua,Zhou,Xu,et al. Photometric Redshifts and Stellar Masses for Galaxies from the DESI Legacy Imaging Surveys[J]. The Astrophysical Journal Supplement Series,2019,242(1). |
APA | Zou,Hu,Gao,Jinghua,Zhou,Xu,&Kong,Xu.(2019).Photometric Redshifts and Stellar Masses for Galaxies from the DESI Legacy Imaging Surveys.The Astrophysical Journal Supplement Series,242(1). |
MLA | Zou,Hu,et al."Photometric Redshifts and Stellar Masses for Galaxies from the DESI Legacy Imaging Surveys".The Astrophysical Journal Supplement Series 242.1(2019). |
入库方式: OAI收割
来源:国家天文台
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