ＡＬＭＡにより見えてきた新しい星形成銀河種族の多波長解析と宇宙星形成史の研究

• Project/Area Number: 16J02047
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 国内
• Research Field: Astronomy
• Research Institution: The University of Tokyo
• Principal Investigator: 山口 裕貴 東京大学, 理学系研究科, 特別研究員(DC1)
• Project Period (FY): 2016-04-22 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥2,800,000 (Direct Cost: ¥2,800,000); Fiscal Year 2018: ¥900,000 (Direct Cost: ¥900,000); Fiscal Year 2017: ¥900,000 (Direct Cost: ¥900,000); Fiscal Year 2016: ¥1,000,000 (Direct Cost: ¥1,000,000)
• Keywords: ALMA / サブミリ波銀河 / 宇宙星形成率密度 / 銀河進化 / ミリ波輝線銀河 / 宇宙星形成密度 / 無バイアスサブミリ波輝線銀河探査 / 輝線光度関数 / 遠赤外微細構造輝線

Outline of Annual Research Achievements

本研究ではALMAを用いたミリ波帯における無バイアスな深探査で得られた高感度・高空間分解能データを基にASAGAOで検出された天体の性質および宇宙星形成率密度への寄与を調査した．本研究では近赤外線に対応天体のあるASAGAO天体の多くが一般的な星形成銀河 (赤方偏移 ~ 1-3) であることがわかった．ところが同様の星形成活動を示す銀河であっても，ALMAで検出されていない銀河も多く発見された．銀河の赤外線光度と紫外線光度の比に着目すると，ASAGAO天体は他の天体に比べ系統的に ~ 1-2 桁程度大きいことが明らかになった．より高い空間分解能のデータを用いたところ，これらの系統的な差は銀河におけるダストと星の分布の違いによってその一部が説明されることが示唆された．ASAGAO天体は赤方偏移 2-3 で宇宙の星形成率密度の大半を担っている一方，赤方偏移2よりも近傍の宇宙ではASAGAO天体よりも赤外線光度の暗い種族が星形成の主役になっていることが示された．

ASAGAOでは近赤外線で非常に暗いALMA連続波天体候補も5つ検出された．ALMA無バイアス観測を基に近赤外線で暗いミリ波天体を系統的に探査したことは本研究のユニークな点である．電波とミリ波におけるフラックス密度比は，これらの天体が赤方偏移3-5付近に存在する可能性を示唆する．これらの天体の星質量や星形成率はこれらが大質量銀河の形成初期段階にある可能性を示唆している．これらの天体は赤方偏移3-5の宇宙において明るいSMGと同程度以上の寄与をしている可能性が示された．本研究により，近赤外線で暗いALMA天体は高赤方偏移宇宙の星形成率密度に対して無視できない寄与をしていることが判明した．これはALMAによる無バイアス観測が，従来の可視光・近赤外線深探査では分解しきれない星形成活動を検出できることを示していると考えられる．

Research Progress Status

平成30年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

平成30年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] ALMA twenty-six arcmin2 survey of GOODS-S at one-millimeter (ASAGAO): Near-infrared-dark faint ALMA sources (2019)
  • Author(s): Yamaguchi, Kohno, Hatsukade, Wang, Yoshimura, Ao, Caputi, Dunlop, Egami, Espada, Fujimoto, Hayatsu, Ivison, Kodama, Kusakabe, Nagao, Ouchi, Rujopakarn, Tadaki, Tamura, Ueda, Umehata, Wang, Yun
  • Journal Title: The Astrophysical Journal Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Detections of [OIII] 88 μm in Two Quasars in the Reionization Epoch (2018)
  • Author(s): Takuya Hashimoto, Akio K. Inoue, Yoichi Tamura, Hiroshi Matsuo, Ken Mawatari, Yuki Yamaguchi,
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 印刷中
  • Peer Reviewed
• [Journal Article] ALMA twenty-six arcmin2 survey of GOODS-S at one millimeter (ASAGAO): Source catalog and number counts (2018)
  • Author(s): Hatsukade Bunyo、Kohno Kotaro、Yamaguchi Yuki、Umehata Hideki et al
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: 6 Pages: 105-122
  • DOI: 10.1093/pasj/psy104
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] ALMA 26 Arcmin2 Survey of GOODS-S at One Millimeter (ASAGAO): Average Morphology of High-z Dusty Star-forming Galaxies in an Exponential Disk (n~=1) (2018)
  • Author(s): Fujimoto, S. et al. (Ueda, Y.)
  • Journal Title: The Astrophysical Journal Volume: 681 Issue: 1 Pages: 7-7
  • DOI: 10.3847/1538-4357/aac6c4
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] ALMA 26 arcmin2 Survey of GOODS-S at One-millimeter (ASAGAO): X-Ray AGN Properties of Millimeter-selected Galaxies (2018)
  • Author(s): Ueda Y.、Hatsukade B.、Kohno K.、Yamaguchi Y.、Tamura Y.、Umehata H.、Akiyama M.、Ao Y.、Aretxaga I.、Caputi K.、Dunlop J. S.、Espada D.、Fujimoto S.、Hayatsu N. H.、Imanishi M.、Inoue A. K.、Ivison R. J.、Kodama T.、Lee M. M.、Matsuoka K.、et al.
  • Journal Title: The Astrophysical Journal Volume: 853 Issue: 1 Pages: 24-24
  • DOI: 10.3847/1538-4357/aa9f10
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Molecular Gas Reservoirs in Cluster Galaxies at z = 1.46 (2018)
  • Author(s): Hayashi Masao、 Tadaki Ken-ichi、 Kodama Tadayuki、 Kohno Kotaro、 Yamaguchi Yuki、 Hatsukade Bunyo、 Koyama Yusei、 Shimakawa Rhythm、 Tamura Yoichi、 Suzuki Tomoko L.
  • Journal Title: The Astrophysical Journal Volume: 856 Issue: 2 Pages: 118-118
  • DOI: 10.3847/1538-4357/aab3e7
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Blind Millimeter Line Emitter Search using ALMA Data Toward Gravitational Lensing Clusters (2017)
  • Author(s): Yamaguchi Yuki、Kohno Kotaro、Tamura Yoichi、Oguri Masamune、Ezawa Hajime、Hayatsu Natsuki H.、Kitayama Tetsu、Matsuda Yuichi、Matsuo Hiroshi、Oshima Tai、Ota Naomi、Izumi Takuma、Umehata Hideki
  • Journal Title: The Astrophysical Journal Volume: 845 Issue: 2 Pages: 108-108
  • DOI: 10.3847/1538-4357/aa80e0
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Evolutionary Phases of Gas-rich Galaxies in a Galaxy Cluster at z = 1.46 (2017)
  • Author(s): Hayashi, M., Kodama, T., Kohno, K., and 7 co-authors
  • Journal Title: The Astrophysical Journal Letters Volume: 841 Issue: 2 Pages: L21-L21
  • DOI: 10.3847/2041-8213/aa71ad
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] ALMA Deep Field in SSA22: Blindly Detected CO Emitters and [CII] Emitter Candidates (2017)
  • Author(s): N. H. Hayatsu, Y. Matsuda, H. Umehata, N. Yoshida, I. Smail, A. M. Swinbank, R. Ivison, K. Kohno, Y. Tamura, M. Kubo, D. Iono, B. Hatsukade, K. Nakanishi, R. Kawabe, T. Nagao, A. K. Inoue1, T. T. Takeuchi, M. Lee, Y. Ao, S. Fujimoto, T. Izumi, Y. Yamaguchi, S. Ikarashi, and T. Yamada
  • Journal Title: Publication of Astronomical Society of Japan Volume: 印刷中
  • Peer Reviewed
• [Journal Article] SXDF-ALMA 2 arcmin2 deep survey: Resolving and characterizing the infrared extragalactic background light down to 0.5 mJy (2016)
  • Author(s): Yamaguchi, Yuki; Tamura, Yoichi; Kohno, Kotaro; Aretxaga, Itziar; Dunlop, James S.; Hatsukade, Bunyo; Hughes, David; Ikarashi, Soh; Ishii, Shun; Ivison, Rob J.; Izumi, Takuma; Kawabe, Ryohei; Kodama, Tadayuki; Lee, Minju et al.
  • Journal Title: PASJ Volume: 68 Issue: 5 Pages: 82-96
  • DOI: 10.1093/pasj/psw073
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] SXDF-ALMA 2-arcmin^2 deep survey: 1.1-mm number counts (2016)
  • Author(s): Hatsukade B., Kohno K., Umehata H., Aretxaga I., Caputi K. I., Dunlop J. S., Ikarashi S., Iono D., Ivison R. J., Lee M., Makiya R., Matsuda Y., Motohara K., Nakanishi K., Ohta K., Tadaki K.-i., Tamura Y., Wang W.-H., Wilson G. W., Yamaguchi Y., Yun M. S.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 68 Issue: 3 Pages: 36-36
  • DOI: 10.1093/pasj/psw026
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Detection of an oxygen emission line from a high-redshift galaxy in the reionization epoch (2016)
  • Author(s): Inoue, Akio K.; Tamura, Yoichi; Matsuo, Hiroshi; Mawatari, Ken; Shimizu, Ikkoh; Shibuya, Takatoshi; Ota, Kazuaki; Yoshida, Naoki; Zackrisson, Erik; Kashikawa, Nobunari; Kohno, Kotaro; Umehata, Hideki; Hatsukade, Bunyo; Iye, Masanori; Matsuda, Yuichi; Okamoto, Takashi; Yamaguchi, Yuki
  • Journal Title: Science Volume: 325 Issue: 6293 Pages: 1559-1562
  • DOI: 10.1126/science.aaf0714
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] The SXDF-ALMA 2-arcmin^2 Deep Survey: Stacking Rest-frame Near-infrared Selected Objects (2016)
  • Author(s): Wang W.-H., Kohno K., Hatsukade B., Umehata H., Aretxaga I., Hughes D., Caputi K. I., Dunlop J. S., Ikarashi S., Iono D., Ivison R. J., Lee M., Makiya R., Matsuda Y., Motohara K., et al.
  • Journal Title: The Astrophysical Journal Volume: 833 Issue: 2 Pages: 195-195
  • DOI: 10.3847/1538-4357/833/2/195
  • Peer Reviewed / Int'l Joint Research
• [Presentation] ALMA 26 arcmin^2 survey of GOODS-S at 1 mm: Physical properties of ALMA-selected galaxies (2018)
  • Author(s): 山口裕貴
  • Organizer: 銀河進化研究会 2018
• [Presentation] ALMA 26 arcmin^2 survey of GOODS-S at 1 mm: Physical properties of ALMA-selected galaxies, (2018)
  • Author(s): 山口裕貴
  • Organizer: Astrophysical Frontiers in the Next Decade and Beyond
  • Int'l Joint Research
• [Presentation] ALMA twenty-Six Arcmin^2; survey of GOODS-S At One-millimeter (ASAGAO): Multi-wavelength properties of ASAGAO continuum sources (2018)
  • Author(s): 山口裕貴
  • Organizer: 日本天文学会春季年会
• [Presentation] Blind search for (sub)mm line emitting galaxies toward lensing clusters (2017)
  • Author(s): 山口裕貴
  • Organizer: A workshop on ALMA deep surveys and their synergies with HST and JWST
  • Place of Presentation: 東大天文センター (東京都三鷹市)
  • Year and Date: 2017-03-31
  • Int'l Joint Research
• [Presentation] 重力レンズ銀河団の ALMA データを用いた CO 光度関数の制限”, 口頭+ポスター (2017)
  • Author(s): 山口裕貴
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 九州大学 (福岡県福岡市)
  • Year and Date: 2017-03-15
• [Presentation] A blind CO line-emitter search using ALMA data toward gravitational lensing clusters (2017)
  • Author(s): 山口裕貴
  • Organizer: East-Asian ALMA Science Workshop 2016
  • Place of Presentation: National Tsing Hua University (台湾)
  • Year and Date: 2017-03-10
  • Int'l Joint Research
• [Presentation] 重力レンズ銀河団のALMAデータを用いた無バイアス輝線銀河探査 (2017)
  • Author(s): 山口裕貴
  • Organizer: 銀河進化研究会2017
• [Presentation] Blind millimeter line emitter search using ALMA data toward gravitational lensing clusters (2017)
  • Author(s): 山口裕貴
  • Organizer: Challenges in Galaxy Evolution: from black holes to the cosmic web,
  • Int'l Joint Research
• [Presentation] Constraint on CO luminosity function using ALMA data of gravitational lensing clusters (2016)
  • Author(s): 山口裕貴
  • Organizer: ALMA/45m/ASTE Users Meeting 2016
  • Place of Presentation: 国立天文台三鷹 (東京都三鷹市)
  • Year and Date: 2016-12-19
  • Int'l Joint Research
• [Presentation] 遠赤外線微細構造輝線を用いた銀河の金属量診断 (2016)
  • Author(s): 山口裕貴
  • Organizer: 銀河微細構造線研究会
  • Place of Presentation: 大阪産業大学梅田サテライト (大阪府大阪市)
  • Year and Date: 2016-11-04
• [Presentation] SXDF-ALMA 2 arcmin^2 Deep Survey: Characterizing of ALMA-Detected Continuum Sources and Millimeter line-Emitter Search (2016)
  • Author(s): 山口裕貴
  • Organizer: Half a Decade of ALMA: Cosmic Dawns Transformed
  • Place of Presentation: Palm Springs (USA)
  • Year and Date: 2016-09-20
  • Int'l Joint Research
• [Presentation] SXDF-ALMA 2 arcmin^2 Deep Surveyのデータを用いた無バイアスミリ波分 子輝線銀河探査 (2016)
  • Author(s): 山口裕貴
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 愛媛大学 (愛媛県松山市)
  • Year and Date: 2016-09-14
• [Presentation] SXDF-ALMA 2 arcmin2 deep survey: Millimeter line-emitter search (2016)
  • Author(s): 山口裕貴
  • Organizer: NRO-ALMA Science/Development Workshop 2016
  • Place of Presentation: 国立天文台野辺山 (長野県南牧村)
  • Year and Date: 2016-07-20
  • Int'l Joint Research
• [Presentation] SXDF-ALMA 2 arcmin2 Deep Survey: The Properties of Faint SMGs and Their Contribution to the IR EBL (2016)
  • Author(s): 山口裕貴
  • Organizer: 銀河進化研究会2016
  • Place of Presentation: 東北大学 (宮城県仙台市)
  • Year and Date: 2016-06-01