Galaxy overdensities around distant QSOs and their contribution to the cosmic reionization revealed with millimeter and optical wide-field observations
| Project/Area Number |
19K14752
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 16010:Astronomy-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Ono Yoshiaki 東京大学, 宇宙線研究所, 助教 (60631116)
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 銀河進化 / 銀河形成 / 高赤方偏移銀河 / 多波長観測 / 機械学習 / クエーサー / 原始銀河団 |
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| Outline of Research at the Start |
近年の広視野探査により赤方偏移7.5クエーサーが発見され，遠方でブラックホール質量が1e+9太陽質量を超えるものも見つかってきた．最新の大規模理論計算から，このような遠方クエーサーのある領域は銀河団の祖先である可能性が示唆されており，特にダストに覆われた銀河を検出できるミリ波での観測が重要であることが示されている．実際に最近，ミリ波干渉計ALMAの観測からクエーサーのごく近傍で銀河の検出が報告され，高密度領域の一端を捉えている可能性が指摘されている．本研究では，他に類を見ないミリ波での高感度な広視野観測を可視観測と組み合わせ，世界に先駆けて明るい遠方クエーサー周囲で銀河を系統的に探査する．
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| Outline of Final Research Achievements |
In this study, we have applied a convolutional neural network to multiwavelength imaging data obtained with Subaru Hyper Suprime-Cam (HSC) to efficiently construct a large sample of Lya-emitting star-forming galaxies at redshifts from 2.2 to 7.0. We have also spectroscopically identified overdense regions of star-forming galaxies at high redshift using Keck and Gemini, and detected significant cross-correlations with submillimeter galaxies by comparing their sky distributions. In addition, we have observed the CO molecular gas emission lines from the spectroscopically confirmed bright star-forming galaxies at redshift around 6 with ALMA and estimated their molecular gas mass densities.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究で構築した大規模なLya輝線銀河サンプルはその後，光度関数や角度相関関数，空間的なLya輝線プロファイルなどといった統計的な性質の議論につながった．また，星形成銀河の高密度領域とサブミリ銀河の間の有意な相互相関は，ダストに覆われていない星形成がダストに覆われた星形成と同じような場所で起きていたことを示唆している．さらに，赤方偏移6程度の明るい星形成銀河の分子ガス質量密度について，静止系IR光度とUV光度の和をもとに求めた星形成率密度とともに過去の結果と比較したところ，赤方偏移6程度でも平均的には近傍の結果と矛盾しないことがわかった．
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Report
(5 results)
Research Products
(55 results)
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[Journal Article] Optical Spectroscopy of Dual Quasar Candidates from the Subaru HSC-SSP program2021
Author(s)
Tang S.、Silverman J.D.、Ding X.、Li J.、Lee K.-G.、Strauss M.A.、Goulding A.、Schramm M.、Kawinwanichakij L.、Xavier P.J.、Hennawi J.F.、Imanishi M.、Iwasawa K.、Toba Y.、Kayo I.、Oguri M.、Matsuoka Y.、Onoue M.、Jahnke K.、Ichikawa K.、Hartwig T.、Kashikawa N.、Kawaguchi Toshihiro、et al.
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Journal Title
The Astrophysical Journal
Volume: 922
Issue: 1
Pages: 83-83
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Dual Supermassive Black Holes at Close Separation Revealed by the Hyper Suprime-Cam Subaru Strategic Program2020
Author(s)
Silverman J.D., Tang S., Lee K.-G., T. Hartwig, A. Goulding, M.A. Strauss, M. Schramm, X. Ding, R. Riffel, S. Fujimoto, C. Hikage, M. Imanishi, K. Iwasawa, K. Jahnke, I. Kayo, N. Kashikawa, T. Kawaguchi, 他16名
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Journal Title
The Astrophysical Journal
Volume: 899
Issue: 2
Pages: 154-154
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] CHORUS. I. Cosmic HydrOgen Reionization Unveiled with Subaru: Overview2020
Author(s)
Inoue Akio K、Yamanaka Satoshi、Ouchi Masami、Iwata Ikuru、Shimasaku Kazuhiro、Taniguchi Yoshiaki、Nagao Tohru、Kashikawa Nobunari、Ono Yoshiaki、Mawatari Ken、Shibuya Takatoshi、Hayashi Masao、Ikeda Hiroyuki、Zhang Haibin、Liang Yongming、Lee Chien-Hsiu、Hilmi Miftahul、Kikuta Satoshi、Kusakabe Haruka、et al.
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Journal Title
Publications of the Astronomical Society of Japan
Volume: 72
Issue: 6
Pages: 101-101
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] CHORUS. III. Photometric and Spectroscopic Properties of Lyα Blobs at z = 4.9-7.02020
Author(s)
Zhang Haibin、Ouchi Masami、Itoh Ryohei、Shibuya Takatoshi、Ono Yoshiaki、Harikane Yuichi、Inoue Akio K.、Rauch Michael、Kikuchihara Shotaro、Nakajima Kimihiko、Yajima Hidenobu、Arata Shohei、Abe Makito、Iwata Ikuru、Kashikawa Nobunari、Kawanomoto Satoshi、Kikuta Satoshi、Kobayashi Masakazu A. R.、et al.
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Journal Title
The Astrophysical Journal
Volume: 891
Issue: 2
Pages: 177-177
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] The CFHT Large Area U-band Deep Survey (CLAUDS)2019
Author(s)
Sawicki Marcin、Arnouts Stephane、Huang Jiasheng、Coupon Jean、Golob Anneya、Gwyn Stephen、Foucaud Sebastien、Moutard Thibaud、Iwata Ikuru、Liu Chengze、Chen Lingjian、Desprez Guillaume、Harikane Yuichi、Ono Yoshiaki、Strauss Michael A、Tanaka Masayuki、Thibert Nathalie、Balogh Michael、Bundy Kevin、et al.
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Journal Title
Monthly Notices of the Royal Astronomical Society
Volume: 489
Pages: 5202-5217
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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