A comprehensive study of forming galaxies

• Project/Area Number: 16K05286
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: The University of Tokyo
• Principal Investigator: Shimasaku Kazuhiro 東京大学, 大学院理学系研究科(理学部), 准教授 (00251405)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 光学赤外線天文学 / 銀河の形成と進化 / 測光観測 / 銀河

Outline of Final Research Achievements

Using data taken with two wide-field optical cameras on the Subaru Telescope, I studied the properties of forming galaxies in ~ 800 - 3,000 million years-old universes. The galaxy samples used for this study are the largest ever obtained. The most important result is that the number density of galaxies was obtained as a function of luminosity and redshift. In addition, the origin of diffuse Lyman alpha halos around young galaxies was also identified; this is important to study the role of the matter around galaxies in galaxy evolution.

Academic Significance and Societal Importance of the Research Achievements

遠方 (過去) の宇宙の多数の銀河のサンプルおよびそれに基づく銀河の光度や質量の統計は、銀河進化モデルへの制限につながるだけでなく、宇宙再電離という現象がいつどのように起きたかを明らかにする上でも役に立つ。今後のより遠方の銀河観測や、個々の銀河の詳細な観測のための基礎データともなる。

Research Products

• [Int'l Joint Research] プリンストン大学(米国)
• [Int'l Joint Research] 中央研究院天文及天文物理研究所(台湾)
• [Journal Article] CHORUS. II. Subaru/HSC Determination of the Lyα Luminosity Function at z = 7.0: Constraints on Cosmic Reionization Model Parameter (2019)
  • Author(s): Itoh, R., et al.
  • Journal Title: The Astrophysical Journal Volume: 867 Issue: 1 Pages: 46-46
  • DOI: 10.3847/1538-4357/aadfe4
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Black versus Dark: Rapid Growth of Supermassive Black Holes in Dark Matter Halos at z ~ 6 (2019)
  • Author(s): Shimasaku, K., Izumi, T.
  • Journal Title: The Astrophysical Journal Letters Volume: 872 Issue: 2 Pages: L29-L29
  • DOI: 10.3847/2041-8213/ab053f
  • Peer Reviewed
• [Journal Article] SILVERRUSH. VI. A simulation of Lyα emitters in the reionization epoch and a comparison with Subaru Hyper Suprime-Cam survey early data (2018)
  • Author(s): Inoue Akio K、Hasegawa Kenji、Ishiyama Tomoaki、Yajima Hidenobu、Shimizu Ikkoh、Umemura Masayuki、Konno Akira、Harikane Yuichi、Shibuya Takatoshi、Ouchi Masami、Shimasaku Kazuhiro、Ono Yoshiaki、Kusakabe Haruka、Higuchi Ryo、Lee Chien-Hsiu
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: 3 Pages: 55-84
  • DOI: 10.1093/pasj/psy048
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The stellar mass, star formation rate and dark matter halo properties of LAEs at z ~ 2 (2018)
  • Author(s): Kusakabe, H., Shimasaku, K. et al. (10 authors in total)
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: 1 Pages: 1-31
  • DOI: 10.1093/pasj/psx148
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The Hyper Suprime-Cam SSP Survey: Overview and survey design (2018)
  • Author(s): Aihara Hiroaki、Arimoto Nobuo、Armstrong Robert、 et al. (including Imanishi M.)
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: SP1 Pages: 1-15
  • DOI: 10.1093/pasj/psx066
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Great Optically Luminous Dropout Research Using Subaru HSC (GOLDRUSH). I. UV luminosity functions at z ~ 4-7 derived with the half-million dropouts on the 100 deg2 sky (2018)
  • Author(s): Ono, Y., Shimasaku, K. et al. (26 authors in total)
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: SP1 Pages: 1-29
  • DOI: 10.1093/pasj/psx103
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Systematic Identification of LAEs for Visible Exploration and Reionization Research Using Subaru HSC (SILVERRUSH). I. Program strategy and clustering properties of ~ 2000 Lyα emitters at z = 6-7 over the 0.3-0.5 Gpc2 survey area (2018)
  • Author(s): Ouchi, M., Shimasaku, K. et al. (20 authors in total)
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: SP1 Pages: 1-16
  • DOI: 10.1093/pasj/psx074
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Angular Momentum Evolution of Stellar Disks at High Redshifts (2018)
  • Author(s): Okamura, T., Shimasaku, K., Kawamata, R.
  • Journal Title: The Astrophysical Journal Volume: 854 Issue: 1 Pages: 22-22
  • DOI: 10.3847/1538-4357/aaa423
  • Peer Reviewed
• [Journal Article] Size - Luminosity Relations and UV Luminosity Functions at z = 6 - 9 Simultaneously Derived from the Complete Hubble Frontier Fields Data (2018)
  • Author(s): Kawamata, R., Shimasaku, K. et al. (6 authors in total)
  • Journal Title: The Astrophysical Journal Volume: 855 Issue: 1 Pages: 4-50
  • DOI: 10.3847/1538-4357/aaa6cf
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Active Galactic Nucleus Environments and Feedback to Neighboring Galaxies at z ~ 5 Probed by Lyα Emitters (2017)
  • Author(s): Kikuta Satoshi、Imanishi Masatoshi、Matsuoka Yoshiki、Matsuda Yuichi、Shimasaku Kazuhiro、Nakata Fumiaki
  • Journal Title: The Astrophysical Journal Volume: 841 Issue: 2 Pages: 128-128
  • DOI: 10.3847/1538-4357/aa72f0
  • Peer Reviewed
• [Journal Article] Lyman-break Galaxies at z ~ 3 in the Subaru Deep Field: Luminosity Function, Clustering, and [O III] Emission (2017)
  • Author(s): Malkan, M. A., Shimasaku, K. et al. (9 authors in total)
  • Journal Title: The Astrophysical Journal Volume: 850 Issue: 1 Pages: 5-5
  • DOI: 10.3847/1538-4357/aa9331
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Lya emitters with very large Lyα equivalent widths, EW0(Lya)~=200-400A, at z~2 (2017)
  • Author(s): Hashimoto, Ouchi et al.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 465 Issue: 2 Pages: 1543-1562
  • DOI: 10.1093/mnras/stw2834
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] EVOLUTION OF STELLAR-TO-HALO MASS RATIO AT z=0-7 IDENTIFIED BY CLUSTERING ANALYSIS WITH THE HUBBLE LEGACY IMAGING AND EARLY SUBARU/HYPER SUPRIME-CAM SURVEY DATA (2016)
  • Author(s): Harikane, Ouchi et al.
  • Journal Title: The Astrophysical Journal Volume: 821 Issue: 2 Pages: 123-145
  • DOI: 10.3847/0004-637x/821/2/123
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Statistical Properties of Diffuse Ly-alpha Halos around Star-forming Galaxies at z~2 (2016)
  • Author(s): Momose, Ouchi et al.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 457 Issue: 3 Pages: 2318-2330
  • DOI: 10.1093/mnras/stw021
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] BRIGHT AND FAINT ENDS OF Lyα LUMINOSITY FUNCTIONS AT z = 2 DETERMINED BY THE SUBARU SURVEY: IMPLICATIONS FOR AGNs, MAGNIFICATION BIAS, AND ISM H I EVOLUTION (2016)
  • Author(s): Konno, Ouchi et al.
  • Journal Title: The Astrophysical Journal Volume: 823 Issue: 1 Pages: 20-36
  • DOI: 10.3847/0004-637x/823/1/20
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] 赤方偏移 ~6 － 9 における銀河紫外光度関数とサイズ-光度関係の同時決定 (2018)
  • Author(s): 川俣良太、嶋作一大ほか
  • Organizer: 日本天文学会2018年春季年会
• [Presentation] The Physical Origin of Diffuse Lyα Halos and High Lyα Escape Fractions of LAEs (2018)
  • Author(s): 日下部晴香、嶋作一大ほか
  • Organizer: 日本天文学会2018年春季年会
• [Presentation] Lyα Emitters with Very Large Lyα Equivalent Widths, EW0 (Lyα) = 200 - 400 A, at z ~ 2 (2017)
  • Author(s): 橋本拓也、嶋作一大ほか
  • Organizer: 日本天文学会2017年春季年会
  • Place of Presentation: 九州大学 (福岡県福岡市)
  • Year and Date: 2017-03-17
• [Presentation] すばる Hyper Suprime-Cam SSP 初期データに基づく z = 5.7 と 6.6 の Lyα光度関数 (2017)
  • Author(s): 今野彰、嶋作一大ほか
  • Organizer: 日本天文学会2017年春季年会
  • Place of Presentation: 九州大学 (福岡県福岡市)
  • Year and Date: 2017-03-17
• [Presentation] First Demographics of Very Bright Lyα Emitters at z ~ 6 - 7 Uncovered by the Subaru HSC Narrowband Data (2017)
  • Author(s): 澁谷隆俊、嶋作一大ほか
  • Organizer: 日本天文学会2017年春季年会
  • Place of Presentation: 九州大学 (福岡県福岡市)
  • Year and Date: 2017-03-17
• [Presentation] Bright End of the UV Luminosity Functions at z = 4 - 7 Derived with the 100 deg2 Data of the Subaru HSC Survey (2017)
  • Author(s): 小野宜昭、嶋作一大ほか
  • Organizer: 日本天文学会2017年春季年会
  • Place of Presentation: 九州大学 (福岡県福岡市)
  • Year and Date: 2017-03-17
• [Presentation] Stellar to Halo Mass Ratio and Baryon Conversion Efficiency of LAEs at z ~ 2 (2017)
  • Author(s): 日下部晴香、嶋作一大ほか
  • Organizer: 日本天文学会2017年秋季年会
• [Presentation] cosmic noon の小質量銀河の星形成 活動とその性質 (2016)
  • Author(s): 日下部晴香、嶋作一大ほか
  • Organizer: 日本天文学会2016年秋季年会
  • Place of Presentation: 愛媛大学 (愛媛県松山市)
  • Year and Date: 2016-09-15
• [Presentation] 赤方偏移 2 における Lyα光度関数の 明るい側と暗い側への強い制限 (2016)
  • Author(s): 今野彰、嶋作一大ほか
  • Organizer: 日本天文学会2016年秋季年会
  • Place of Presentation: 愛媛大学 (愛媛県松山市)
  • Year and Date: 2016-09-15
• [Presentation] 多波長分光データで探る z=5-8 におけ る銀河の星間物質と宇宙再電離 (2016)
  • Author(s): 播金優一、嶋作一大ほか
  • Organizer: 日本天文学会2016年秋季年会
  • Place of Presentation: 愛媛大学 (愛媛県松山市)
  • Year and Date: 2016-09-15