2021 Fiscal Year Research-status Report
すばる望遠鏡 広領域探査データを用いた遠方銀河形態の研究
| Project/Area Number |
20K14508
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| Research Institution | Kitami Institute of Technology |
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Principal Investigator |
澁谷 隆俊 北見工業大学, 工学部, 助教 (30713995)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 銀河形態 / 遠方銀河 / すばる望遠鏡 |
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| Outline of Annual Research Achievements |
昨年度に引き続き，すばる望遠鏡の広視野カメラ Hyper Suprime-Cam (HSC) 画像を高解像度化させ，遠方銀河の形態研究を行なった．高解像度化HSC画像を用いて，遠方銀河を合体銀河と孤立銀河に形態分類し，静止系紫外線で明るい銀河の合体率を測定した．研究結果を学術論文に纏め，論文を専門誌に投稿した．論文投稿後，合体銀河の検出における，完全性 (completeness)，汚染率 (contamination rate)，前景/背景銀河の写り込みの効果 (chance projection effect) の見積もり方法等を微修正し，論文を専門誌に掲載受理させることができた (Shibuya et al. 2022)．
上記研究では，HSC画像を古典的手法で高解像度化させている．古典的手法に加えて今年度は，スパースモデリングに基づく画像高解像度化ソフトウェアを開発した．本手法では，点像分布関数の逆畳み込み手法に疎性および平坦性の制約条件を加えている．本ソフトウェアでHSCデータを解析したところ，古典的手法と同等かそれ以上の解像度まで，HSC画像を高解像度化させることができた．さらに，銀河形態推定用の機械学習ソフトウェアの開発も同時に進めており，現在，性能評価および改良を行なっている．これらの新しいソフトウェアを用いて，遠方銀河形態の環境依存性に関する研究を開始した．
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
スパースモデリングに基づく画像高解像度化ソフトウェアを開発し，遠方銀河形態に関する新しい研究を開始することができたため．
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| Strategy for Future Research Activity |
スパースモデリング，機械学習に基づく画像高解像度化および銀河形態推定ソフトウェアを用いて，遠方銀河形態の環境依存性に関する研究を行う．研究結果を学術論文に纏める．
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| Causes of Carryover |
世界的半導体不足により，購入予定のコンピュータを年度内に確保することが出来なかったため．次年度はコンピュータの入手ルートを広げ，早めに購入手続きを行う．
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[Journal Article] CHORUS. IV. Mapping the Spatially Inhomogeneous Cosmic Reionization with Subaru HSC2022
Author(s)
Yoshioka Takehiro, Kashikawa Nobunari, Inoue Akio K., Yamanaka Satoshi, Shimasaku Kazuhiro, Harikane Yuichi, Shibuya Takatoshi, Momose Rieko, Ito Kei, Liang Yongming, Ishimoto Rikako, Takeda Yoshihiro, Ouchi Masami, Lee Chien-Hsiu
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Journal Title
The Astrophysical Journal
Volume: 927
Pages: 32～32
DOI
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] GOLDRUSH. IV. Luminosity Functions and Clustering Revealed with 4,000,000 Galaxies at z~2-7: Galaxy-AGN Transition, Star Formation Efficiency, and Implication for Evolution at z>102022
Author(s)
Harikane Yuichi, Ono Yoshiaki, Ouchi Masami, Liu Chengze, Sawicki Marcin, Shibuya Takatoshi, Behroozi Peter S., He Wanqiu, Shimasaku Kazuhiro, Arnouts Stephane, Coupon Jean, Fujimoto Seiji, Gwyn Stephen, Huang Jiasheng, Inoue Akio K., Kashikawa Nobunari, Komiyama Yutaka, Matsuoka Yoshiki, Willott Chris J.
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Journal Title
The Astrophysical Journal Supplement Series
Volume: 259
Pages: 20～20
DOI
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] SILVERRUSH X: Machine Learning-aided Selection of 9318 LAEs at z = 2.2, 3.3, 4.9, 5.7, 6.6, and 7.0 from the HSC SSP and CHORUS Survey Data2021
Author(s)
Ono Yoshiaki, Itoh Ryohei, Shibuya Takatoshi, Ouchi Masami, Harikane Yuichi, Yamanaka Satoshi, Inoue Akio K., Amagasa Toshiyuki, Miura Daichi, Okura Maiki, Shimasaku Kazuhiro, Iwata Ikuru, Taniguchi Yoshiaki, Fujimoto Seiji, Iye Masanori, Jaelani Anton T., Kashikawa Nobunari, Kikuchihara Shotaro, Kikuta Satoshi, et al.
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Journal Title
The Astrophysical Journal
Volume: 911
Pages: 78～78
DOI
Peer Reviewed / Int'l Joint Research
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[Journal Article] EMPRESS. II. Highly Fe-enriched Metal-poor Galaxies with ~1.0 (Fe/O)_sun and 0.02 (O/H)_sun: Possible Traces of Supermassive (>300 M_sun) Stars in Early Galaxies2021
Author(s)
Kojima Takashi, Ouchi Masami, Rauch Michael, Ono Yoshiaki, Nakajima Kimihiko, Isobe Yuki, Fujimoto Seiji, Harikane Yuichi, Hashimoto Takuya, Hayashi Masao, Komiyama Yutaka, Kusakabe Haruka, Kim Ji Hoon, Lee Chien-Hsiu, Mukae Shiro, Nagao Tohru, Onodera Masato, Shibuya Takatoshi, Sugahara Yuma, Umemura Masayuki, et al.
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Journal Title
The Astrophysical Journal
Volume: 913
Pages: 22～22
DOI
Peer Reviewed / Int'l Joint Research
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[Journal Article] SILVERRUSH. IX. Lyα Intensity Mapping with Star-forming Galaxies at z = 5.7 and 6.6: A Possible Detection of Extended Lyα Emission at >~100 Comoving Kiloparsecs around and beyond the Virial-radius Scale of Galaxy Dark Matter Halos2021
Author(s)
Kakuma Ryota, Ouchi Masami, Harikane Yuichi, Ono Yoshiaki, Inoue Akio K., Komiyama Yutaka, Kusakabe Haruka, Lee Chien-Hsiu, Matsuda Yuichi, Matsuoka Yoshiki, Mawatari Ken, Momose Rieko, Shibuya Takatoshi, Taniguchi Yoshiaki
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Journal Title
The Astrophysical Journal
Volume: 916
Pages: 22～22
DOI
Peer Reviewed
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[Journal Article] EMPRESS. III. Morphology, Stellar Population, and Dynamics of Extremely Metal-poor Galaxies (EMPGs): Are EMPGs Local Analogs of High-z Young Galaxies?2021
Author(s)
Isobe Yuki, Ouchi Masami, Kojima Takashi, Shibuya Takatoshi, Hayashi Kohei, Rauch Michael, Kikuchihara Shotaro, Zhang Haibin, Ono Yoshiaki, Fujimoto Seiji, Harikane Yuichi, Kim Ji Hoon, Komiyama Yutaka, Kusakabe Haruka, Lee Chien-Hsiu, Mawatari Ken, Onodera Masato, Sugahara Yuma, Yabe Kiyoto
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Journal Title
The Astrophysical Journal
Volume: 918
Pages: 54～54
DOI
Peer Reviewed / Int'l Joint Research
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[Journal Article] Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XIV. A Candidate Type II Quasar at z = 6.12922021
Author(s)
Onoue Masafusa, Matsuoka Yoshiki, Kashikawa Nobunari, Strauss Michael A., Iwasawa Kazushi, Izumi Takuma, Nagao Tohru, Asami Naoko, Fujimoto Seiji, Harikane Yuichi, Hashimoto Takuya, Imanishi Masatoshi, Lee Chien-Hsiu, Shibuya Takatoshi, Toba Yoshiki
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Journal Title
The Astrophysical Journal
Volume: 919
Pages: 61～61
DOI
Peer Reviewed / Int'l Joint Research
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[Journal Article] Hyper Suprime-Cam Subaru Strategic Program: A Mass-dependent Slope of the Galaxy Size-Mass Relation at z<12021
Author(s)
Kawinwanichakij Lalitwadee, Silverman John D., Ding Xuheng, George Angelo, Damjanov Ivana, Sawicki Marcin, Tanaka Masayuki, Taranu Dan S., Birrer Simon, Huang Song, Li Junyao, Onodera Masato, Shibuya Takatoshi, Yasuda Naoki
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Journal Title
The Astrophysical Journal
Volume: 921
Pages: 38～38
DOI
Peer Reviewed / Int'l Joint Research
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