Studying Galaxy Formation by very Wide-Field Observations

• Project/Area Number: 26400217
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: Japan Aerospace EXploration Agency (2015-2016); Tohoku University (2014)
• Principal Investigator: YAMADA TORU 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 教授 (90271519)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 銀河形成 / 銀河進化 / 原始銀河団 / すばる望遠鏡 / 広視野 / 広視野撮像

Outline of Final Research Achievements

The purpose of this study is to investigate the galaxy formation process in the early universe with the age of 1-3Gyr when the galaxy formation was strongly biased to the large scale high density regions, based on the wide field observational data obtained by the Subaru telescope. We focused on a z=3.1 SSA22 high density region with a protocluster and studied the distribution of the LyAlpha emission line strength as well as unveiled the presence of large-scale neutral hydrogen inter-galactic gas associated with the structure. We also studied the detailed properties of the progenitors of massive cluster galaxies with Subaru adaptive optics observations as well as ALMA data. We also studied the star-formation properties of the galaxies at z=4 base on the analysis of their rest-frame ultraviolet spectra. We found apparently red and faint Lyman Break galaxies are indeed dust-obscured very intense star-forming galaxies.15 papers and 8 reports for meetings have been published.

Research Products

• [Journal Article] Bimodal morphologies of massive galaxies at the core of a protocluster at z=3.09 and the strong size growth of a brightest cluster galaxy (2017)
  • Author(s): Kubo, M., Yamada, T. 他5名 (2番目）
  • Journal Title: Monthly Notices of Royal Astronomical Society Volume: 印刷中 Issue: 2 Pages: 2235-2250
  • DOI: 10.1093/mnras/stx920
  • Peer Reviewed / Open Access
• [Journal Article] Imaging of diffuse H I absorption structure in the SSA22 protocluster region at z = 3.1 (2017)
  • Author(s): Ken Mawatari et al.
  • Journal Title: Manthly Notices of the Royal Astronomical Sosciety Volume: 467 Pages: 3951-3962
  • DOI: 10.1093/mnras/stx038
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Searching for candidates of Lyman continuum sources - revisiting the SSA22 field (2017)
  • Author(s): G. Micheva, I. wata, A. K. Inoue, Y. Matsuda, T. Yamada, T. Hayashino
  • Journal Title: MNRAS Volume: 465 Issue: 1 Pages: 316-336
  • DOI: 10.1093/mnras/stw2700
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] ALMA Observations of Ly alpha Blob 1: Halo Substructure Illuminated from Within (2016)
  • Author(s): GEach, J. E., et al.
  • Journal Title: ApJ Volume: 832 Issue: 1 Pages: 37-43
  • DOI: 10.3847/0004-637x/832/1/37
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] ALMA observations of a z= 3.1 protocluster: star formation from active galactic nuclei and Lyman-alpha blobs in an overdense environment (2016)
  • Author(s): D.M. Alexander et al.
  • Journal Title: Manthly Notices of the Royal Astronomical Sosciety Volume: 461 Issue: 3 Pages: 2944-2952
  • DOI: 10.1093/mnras/stw1509
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] A New Constraint on the Lyα Fraction of UV Very Bright Galaxies at Redshift 7 (2016)
  • Author(s): Furusawa, H., 他１７名（１４番目）
  • Journal Title: The Astrophysical Journal Volume: 822 Issue: 1 Pages: 46-58
  • DOI: 10.3847/0004-637x/822/1/46
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Possible identification of massive and evolved galaxies at z ~ 5 (2016)
  • Author(s): Mawatari, K., Yamada, T., Fazio, G.G., Huang, J.S., Ashby, M.LN
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 未定 Issue: 3
  • DOI: 10.1093/pasj/psw041
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Discovery of a Damped Lyα Absorber at z = 3.3 along a Galaxy Sight-line in the SSA22 Field (2016)
  • Author(s): Mawatari, K., Inoue, A.K., Kousai, K., Hayashino, T., Cooke, R., Prochaska, J.X., Yamada, T., Matsuda, Y.
  • Journal Title: The Astrophysical Journal Volume: 817 Issue: 2 Pages: 161-166
  • DOI: 10.3847/0004-637x/817/2/161
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] An extremely dense group of massive galaxies at the centre of the protocluster at z = 3.09 in the SSA22 field (2016)
  • Author(s): Kubo, M., Yamada, T., Ichikawa, T., Kajisawa, M., Matsuda, Y., Tanaka, I., Umehata, H
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 455 Issue: 3 Pages: 3333-3344
  • DOI: 10.1093/mnras/stv2392
  • Peer Reviewed / Open Access
• [Journal Article] ALMA Deep Field in SSA22: A Concentration of Dusty Starbursts in a z = 3.09 Protocluster Core (2015)
  • Author(s): Umehata, H, 他２２名, ２１番目
  • Journal Title: The Astrophysical Journal Volume: 815 Issue: 1 Pages: 8-13
  • DOI: 10.1088/2041-8205/815/1/l8
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The environments of Ly-alpha blobs - I. Wide-field Ly-alpha imaging of TN J1338-1942, a powerful radio galaxy at z ~ 4.1 associated with a giant Ly-alpha nebula (2015)
  • Author(s): T. Saito, Y. Matsuda, C. G. Lacey, I. Smail, A. Orsi, C. M. Baugh, A. K. Inoue, I. Tanaka, T. Yamada, K. Ohta, C. De Breuck, T. Kodama, Y. Taniguchi
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 447 Issue: 4 Pages: 3069-3086
  • DOI: 10.1093/mnras/stu2538
  • Peer Reviewed / Open Access
• [Journal Article] NIR Spectroscopic Observation of Massive Galaxies in the Protocluster at z = 3.09 (2015)
  • Author(s): M. Kubo, T. Yamada, T. Ichikawa, M. Kajisawa, Y. Matsuda, I. Tanaka
  • Journal Title: Astrophysical Journal Volume: 799 Issue: 1 Pages: 38-38
  • DOI: 10.1088/0004-637x/799/1/38
  • Peer Reviewed / Open Access
• [Journal Article] AzTEC/ASTE 1.1-mm survey of SSA22: Counterpart identification and photometric redshift survey of submillimetre galaxies (2014)
  • Author(s): Umehata, H., Tamura, Y., Kohno, K., et al
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 440 Issue: 4 Pages: 3462-3478
  • DOI: 10.1093/mnras/stu447
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] AGNの光度変光と母銀河の色選択による高赤方偏移・小質量SMBHサンプルの獲得 (2016)
  • Author(s): 木村勇貴
  • Organizer: 日本天文学会２０１６年度春季年会
  • Place of Presentation: 首都大学東京
  • Year and Date: 2016-03-14
• [Presentation] Massive Galaxy Formation in the Protocluster at z=3 (2016)
  • Author(s): Toru Yamada
  • Organizer: From Stellar Evolution to Galaxy Formation
  • Place of Presentation: Nagano, Japan
  • Year and Date: 2016-03-04
  • Int'l Joint Research / Invited
• [Presentation] Lyman Break銀河スペクトル中に発見された赤方偏移3.3のDamped Lyα system (2015)
  • Author(s): 馬渡健
  • Organizer: 日本天文学会２０１５年秋季年会
  • Place of Presentation: 甲南大学
  • Year and Date: 2015-09-09
• [Presentation] SSA22領域におけるLarge EW(Lyα) LAEのstaller component (2015)
  • Author(s): 大塚拓也
  • Organizer: 日本天文学会２０１５年秋季年会
  • Place of Presentation: 甲南大学
  • Year and Date: 2015-09-09
• [Presentation] WISH: Wide Field Imaging Surveyor for High-redshift (2015)
  • Author(s): Toru Yamada
  • Organizer: IAU XXIX GENERAL ASSEMBLY SYMPOSIA 319 Galaxies at High Redshift and Their Evolution Over Cosmic Time
  • Place of Presentation: ホノルル
  • Year and Date: 2015-08-11
  • Int'l Joint Research
• [Presentation] z=3.09 の非常に高密度な銀河群の発見 (2015)
  • Author(s): 久保真理子, 山田亨, 市川隆, 鍛冶澤賢, 松田有 一, 田中壱
  • Organizer: 日本天文学会
  • Place of Presentation: 大阪大学 （大阪府豊中市）
  • Year and Date: 2015-03-21
• [Presentation] SSA22領域におけるLyα輝線のEWが大きいLAEs (2014)
  • Author(s): 大塚拓也, 山田亨、松田有一、林野友紀
  • Organizer: 日本天文学会
  • Place of Presentation: 山形大学 （山形県山形市）
  • Year and Date: 2014-09-12
• [Presentation] 赤方偏移4の星形成銀河のスペクトルスロープβと空間相関 (2014)
  • Author(s): 山中郷史、山田亨
  • Organizer: 日本天文学会
  • Place of Presentation: 山形大学 （山形県山形市）
  • Year and Date: 2014-09-12