Extremely Metal-poor Representatives Explored by the Subaru Survey (EMPRESS). I. A Successful Machine-learning Selection of Metal-poor Galaxies and the Discovery of a Galaxy with M* < 106 M ⊙ and 0.016 Z ⊙,The Astrophysical Journal

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Extremely Metal-poor Representatives Explored by the Subaru Survey (EMPRESS). I. A Successful Machine-learning Selection of Metal-poor Galaxies and the Discovery of a Galaxy with M* < 106 M ⊙ and 0.016 Z ⊙
The Astrophysical Journal ( IF 4.8 ) Pub Date : 2020-08-03 , DOI: 10.3847/1538-4357/aba047
Takashi Kojima _{1,

2} , Masami Ouchi _{1,

3,

4} , Michael Rauch ₅ , Yoshiaki Ono ₁ , Kimihiko Nakajima ₃ , Yuki Isobe _{1,

2} , Seiji Fujimoto _{6,

7} , Yuichi Harikane _{1,

3,

8} , Takuya Hashimoto ₉ , Masao Hayashi ₃ , Yutaka Komiyama ₃ , Haruka Kusakabe ₁₀ , Ji Hoon Kim _{11,

12} , Chien-Hsiu Lee ₁₃ , Shiro Mukae _{1,

14} , Tohru Nagao ₁₅ , Masato Onodera _{11,

16} , Takatoshi Shibuya ₁₇ , Yuma Sugahara _{1,

2,

3,

18} , Masayuki Umemura ₁₉ , Kiyoto Yabe ₄

Affiliation

Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan
Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa, Chiba 277-8583, Japan
Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101, USA
Cosmic Dawn Center (DAWN), Copenhagen, Denmark
Niels Bohr Institute, University of Copenhagen, Lyngbyvej 2, DK-2100 Copenhagen, Denmark
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
Tomonaga Center for the History of the Universe (TCHoU), Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
Observatoire de Genve, Universit de Genve, 51 Ch. des Maillettes, 1290 Versoix, Switzerland
Subaru Telescope, National Astronomical Observatory of Japan, National Institutes of Natural Sciences (NINS), 650 North Aohoku Place, Hilo, HI 96720, USA
Metaspace, 36 Nonhyeon-ro, Gangnam-gu, Seoul 06312, Republic of Korea
NSF’s National Optical Infrared Astronomy Research Laboratory, Tucson, AZ 85719, USA
Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-0033, Japan
Research Center for Space and Cosmic Evolution, Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
Department of Astronomical Science, SOKENDAI (The Graduate University for Advanced Studies), Osawa 2-21-1, Mitaka, Tokyo, 181-8588, Japan
Kitami Institute of Technology, 165 Koen-cho, Kitami, Hokkaido 090-8507, Japan
Waseda Research Institute for Science and Engineering, Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, Japan
Center for Computational Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

We have initiated a new survey for local extremely metal-poor galaxies (EMPGs) with Subaru/Hyper Suprime-Cam (HSC) large-area (~500 deg^2) optical images reaching a 5 sigma limit of ~26 magnitude, about 100 times deeper than the Sloan Digital Sky Survey (SDSS). To select Z/Z_sun 6 reported recently. We spectroscopically confirm that 3 out of 10 candidates are truly EMPGs with Z/Z_sun<0.1, one of which is HSC J1631+4426, the most metal-poor galaxy with Z/Z_sun=0.017 reported ever.

中文翻译：

斯巴鲁调查 (EMPRESS) 调查了极度缺乏金属的代表。I. 成功的机器学习选择贫金属星系和发现 M* < 106 M ⊙ 和 0.016 Z ⊙ 的星系

我们已经启动了一项针对本地极度贫金属星系 (EMPG) 的新调查，使用 Subaru/Hyper Suprime-Cam (HSC) 大面积 (~500 deg^2) 光学图像达到~26 星等的 5 西格玛极限，约 100比斯隆数字巡天 (SDSS) 深几倍。选择最近报道的Z/Z_sun 6。我们通过光谱证实，10 个候选星系中有 3 个是 Z/Z_sun<0.1 的真正 EMPG，其中之一是 HSC J1631+4426，这是有史以来报道的 Z/Z_sun=0.017 金属最贫乏的星系。

更新日期：2020-08-03

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