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タイトル: | Subaru Hyper Suprime-Cam Survey for an optical counterpart of GW170817 |
著者: | Tominaga, Nozomu Tanaka, Masaomi Morokuma, Tomoki Utsumi, Yousuke Yamaguchi, Masaki S Yasuda, Naoki Tanaka, Masayuki Yoshida, Michitoshi Fujiyoshi, Takuya Furusawa, Hisanori Kawabata, Koji S Lee, Chien-Hsiu Motohara, Kentaro Ohsawa, Ryou Ohta, Kouji Terai, Tsuyoshi Abe, Fumio Aoki, Wako Asakura, Yuichiro Barway, Sudhanshu Bond, Ian A Fujisawa, Kenta Honda, Satoshi Ioka, Kunihito https://orcid.org/0000-0002-3517-1956 (unconfirmed) Itoh, Youichi Kawai, Nobuyuki Kim, Ji Hoon Koshimoto, Naoki Matsubayashi, Kazuya Miyazaki, Shota Saito, Tomoki Sekiguchi, Yuichiro Sumi, Takahiro Tristram, Paul J , |
著者名の別形: | 太田, 耕司 井岡, 邦仁 関口, 雄一郎 |
キーワード: | nuclear reactions nucleosynthesis abundances gravitational waves surveys stars: neutron |
発行日: | Mar-2018 |
出版者: | Oxford University Press (OUP) |
誌名: | Publications of the Astronomical Society of Japan |
巻: | 70 |
号: | 2 |
開始ページ: | 28 |
抄録: | We perform a z-band survey for an optical counterpart of the binary neutron star coalescence GW170817 with Subaru/Hyper Suprime-Cam. Our untargeted transient search covers 23.6 deg² corresponding to the 56.6% credible region of GW170817 and reaches the 50% completeness magnitude of 20.6 mag on average. As a result, we find 60 candidate extragalactic transients, including J-GEM17btc (also known as SSS17a/DLT17ck). While J-GEM17btc is associated with NGC 4993, which is firmly located inside the 3D skymap of GW170817, the other 59 candidates do not have distance information in the GLADE v2 catalog or NASA/IPAC Extragalactic Database. Among 59 of the candidates, 58 are located at the center of extended objects in the Pan-STARRS1 catalog, while one candidate has an offset. We present location, z-band apparent magnitude, and time variability of the candidates and evaluate the probabilities that they are located within the 3D skymap of GW170817. The probability for J-GEM17btc is 64%, which is much higher than for the other 59 candidates (9.3 × 10⁻³–2.1 × 10⁻¹%). Furthermore, the possibility that at least one of the other 59 candidates is located within the 3D skymap is only 3.2%. Therefore, we conclude that J-GEM17btc is the most likely and distinguished candidate to be the optical counterpart of GW170817. |
著作権等: | © The Author(s) 2018. Published by Oxford University Press on behalf of the Astronomical Society of Japan. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
URI: | http://hdl.handle.net/2433/235002 |
DOI(出版社版): | 10.1093/pasj/psy007 |
出現コレクション: | 学術雑誌掲載論文等 |
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