赤方偏移した分子・原子輝線のサブミリ波観測による銀河進化と星形成史の解明

• Project/Area Number: 15071202
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: The University of Tokyo
• Principal Investigator: 河野 孝太郎 The University of Tokyo, 大学院・理学系研究科, 准教授 (80321587)
• Co-Investigator(Kenkyū-buntansha): 半田 利弘 東京大学, 大学院・理学系研究科, 助教 (40202270) ; 祖父江 義明 鹿児島大学, 理学部, 教授 (10022667) ; 長谷川 哲夫 国立天文台, 電波天文学研究系, 教授 (50134630) ; 関本 裕太郎 国立天文台, 電波天文学研究系, 准教授 (70262152)
• Project Period (FY): 2003 – 2007
• Project Status: Completed (Fiscal Year 2007)
• Budget Amount: ¥323,800,000 (Direct Cost: ¥323,800,000); Fiscal Year 2007: ¥27,700,000 (Direct Cost: ¥27,700,000); Fiscal Year 2006: ¥44,900,000 (Direct Cost: ¥44,900,000); Fiscal Year 2005: ¥78,000,000 (Direct Cost: ¥78,000,000); Fiscal Year 2004: ¥80,100,000 (Direct Cost: ¥80,100,000); Fiscal Year 2003: ¥93,100,000 (Direct Cost: ¥93,100,000)
• Keywords: サブミリ波 / 準テラヘルツ / 銀河形成 / 星間物質 / 超伝導受信機 / 高赤方偏移銀河 / テラヘルツ / 爆発的星形成

Research Abstract

研究最終年次となるH19年度には、これまで進めてきた比較的距離の近い銀河でのサブミリ波観測に加え、本格的な高赤方偏移天体の観測にも着手できた。その結果、合計1平方度に達するような天域でのサブミリ波掃天観測が実施され、合計400個を超えるような、新たな高赤方偏移天体を発見することに成功した。これは、過去10年間に行われてきた高赤方偏移サブミリ波天体の観測研究を、わずか約3ケ月の観測運用で質・量ともに圧倒的に凌駕するものである。既に蓄積されている他の波長帯での深い撮像データ、すなわち、すばる望遠鏡による可視光・赤外線帯の深撮像データ、輝線天体のデータ、また、あかり衛星における遠赤外線帯深撮像データなどとの比較を進めているが、発見された天体の多くは確かに高赤方偏移であり、従来知られていなかった爆発的星形成銀河が初期宇宙に莫大に存在していることを示すことができた。これら発見された天体の距離の不定性はあるが、高赤方偏移宇宙における星形成率密度に重要な制限(下限値)を与えることになると考えられる。
この他、サブミリ波350GHz帯サイドバンド分離型受信機CATS345の開発・搭載に成功、SSBシステム雑音温度200K代という極めて良好な観測性能を達成したほか、準テラヘルツ帯800GHz帯で動作する新しい超伝導デバイス(窒化ニオブや窒化ニオブチタン)の開発成功、それを用いた800GHz帯2偏波同時受信機AEROの開発が進むなど、準テラヘルツ帯の本格的な観測を大きく発展させる成果を得たと考えている。

Research Products

• [Journal Article] Dense gas in normal and active galaxies (2008)
  • Author(s): Kohno, K., et. al. (7 authors)
  • Journal Title: Astrophysics and Space Science 313 Pages: 279-285
  • Peer Reviewed
• [Journal Article] ASTE CO(3-2) Observations of the Southern Barred Spiral Galaxy NGC 986: a Large Gaseous Bar Filled with Dense Molecular Medium (2008)
  • Author(s): Kohno, K., et. al. (24 authors)
  • Journal Title: Publications of the Astronomical Society of Japan (掲載確定)(印刷中)
  • Peer Reviewed
• [Journal Article] First Detection of 12 CO(1->0) Emission from Two Narrow-Line Seyfertl Galaxies (2008)
  • Author(s): Kawaguchi, T., et. al. (5 authors)
  • Journal Title: The Astrophysical Journal 676 Pages: 137-146
  • Peer Reviewed
• [Journal Article] Millimeter Interferometric HCN (1-0)and HCO+(1-0) Observations of Luminous Infrared Galaxies (2007)
  • Author(s): Imanishi, M., et. al. (5 authors)
  • Journal Title: The Astronomical Journal 134 Pages: 2366-2384
  • Peer Reviewed
• [Journal Article] Arclike Distribution of High CO (J=3-2)/CO (J=1-0) Ratio Gas Surround ing the Central. Star Cluster of the Supergiant H II Region NGC 604 (2007)
  • Author(s): Tosaki, T., et. al. (8 authors)
  • Journal Title: The Astrophysical Journal 664 Pages: 27-30
  • Peer Reviewed
• [Journal Article] A Revised Estimate of the CO J=1-0 Emission from the Host Galaxy of GRB 030329 Using the Nobeyama Millimeter Array (2007)
  • Author(s): Endo, A., et. al. (12 authors)
  • Journal Title: The Astrophysical Journal 659 Pages: 1431-1437
  • Peer Reviewed
• [Journal Article] A Search for CO (J=3-2) Emission from the Host Galaxy of GRB980425 with the Atacama Submillimeter Telescope Experiment (2007)
  • Author(s): Hatsukade, B., et. al. (17 authors)
  • Journal Title: Publications of the Astronomical Society of Japan 59 Pages: 67-72
  • Peer Reviewed
• [Journal Article] ASTE 12CO(J=3-2) Survey of Elliptical Galaxies (2007)
  • Author(s): Nakanishi, H., et. al. (5 authors)
  • Journal Title: Publications of the Astronomical Society of Japan 59 Pages: 61-65
  • Peer Reviewed
• [Journal Article] Evidence for a Population of High-Redshift Submillimeter Galaxies from Interferometric Imaging (2007)
  • Author(s): Younger, Joshua D., et. al. (24 authors)
  • Journal Title: The Astrophysical Journal 671 Pages: 1531-1537
  • Peer Reviewed
• [Journal Article] Giant Molecular Association in Spiral Arms of M 31 : I. Evidence for Dense Gas Formation via Spiral Shock Associated with Density Waves? (2007)
  • Author(s): Tosaki, T., Shioya, Y., (他4名), Kohno, K.
  • Journal Title: Publications of the Astronomical Society of Japan 59 Pages: 33-42
• [Journal Article] ASTE CO(3-2) Observations of the Barred Spiral Galaxy M 83 : I. Correlation between CO(3-2)/CO(1-0) Ratios and Star Formation Efficiencies (2007)
  • Author(s): Muraoka, K., Kohno, K., Tosaki, T., Kuno, N., Nakanishi, K., et al.
  • Journal Title: Publications of the Astronomical Society of Japan 59 Pages: 43-54
• [Journal Article] A search for CO(J=3-2) emission from the host galaxy of GRB 980425 with the Atacama Submillimeter Telescope Experiment (2007)
  • Author(s): Hatsukade, B., Kohno, K., Endo, A., Tosaki, T., Ohta, K., et al.
  • Journal Title: Publications of the Astronomical Society of Japan 59 Pages: 67-72
• [Journal Article] ASTE 12CO(J=3-2) Survey of Elliptical Galaxies (2007)
  • Author(s): Nakanishi, H., Tosaki, T, Kohno, K., Sofue, Y., Kuno, N.
  • Journal Title: Publications of the Astronomical Society of Japan 59 Pages: 61-65
  • NAID: 10023944057
• [Journal Article] ASTE observations of nearby galaxies : a tight correlation between CO (J=3-2) emission and H alpha (2007)
  • Author(s): Komugi, S., Kohno, K., Tosaki, T., Onodera, S, Egusa, F., Sofue, Y.
  • Journal Title: Publications of the Astronomical Society of Japan 59 Pages: 55-60
• [Journal Article] CO (3-2) and CO (2-1) Detections in a z=1.3 Hyper-Luminous Starburst Galaxy (2006)
  • Author(s): Iono, D., Tamura, Y., Nakanishi, K., Kawabe, R., Kohno, K.et al.
  • Journal Title: Publications of the Astronomical Society of Japan 58 Pages: 957-963
• [Journal Article] Thermal SiO and H^<13>CO^+ Line Observations of the Dense Molecular Cloud G0.11-0.11 in the Galactic Center Region (2006)
  • Author(s): Handa, T., Sakano, M., Naito, S., Hiramatsu, M., Tsuboi, M.
  • Journal Title: Astrophys.Journal. 636 Pages: 261-266
• [Journal Article] The Elongations and Supersonic Motions of Molecular Clouds (2006)
  • Author(s): Koda, J., Sawada, T., Hasegawa, T., Scoville, N.Z.
  • Journal Title: Astrophys.Journal. 638 Pages: 191-195
• [Journal Article] The Atacama Submillimeter Telescope Experiment (2005)
  • Author(s): Kohno, K.
  • Journal Title: Astronomical Soc.Pacific Conference Series 344 Pages: 242-247
• [Journal Article] Dense and Warm Molecular Gas between Double Nuclei of the Luminous Infrared Galaxy NGC 6240 (2005)
  • Author(s): Nakanishi, K., Okumura, K.S., Kohno, K., Kawabe, R., Nakagawa, T.
  • Journal Title: Publ.Astron.Soc.Japan 57 Pages: 575-586
• [Journal Article] Prevalence of Compact Nuclear Starbursts in Nearby Seyfert Galaxies (2005)
  • Author(s): Kohno, K.
  • Journal Title: American Inst.Phys.Conference Proceedings 783 Pages: 203-208
• [Journal Article] Virgo High-Resolution CO Survey : V.Circumnuclear Elliptical Ring in NGC 4569 (2005)
  • Author(s): Nakanishi, H., Sofue, Y., Koda, J.
  • Journal Title: Publ.Astron.Soc.Japan 57 Pages: 905-916
• [Journal Article] Nobeyama Millimeter Array Observations of GRB 030329:a Decay of Afterglow with Bumps and Molecular Gas in the Host Galaxy (2005)
  • Author(s): Kohno, K., Sofue, Y., 他13名
  • Journal Title: Publications of the Astronomical Society of Japan 57 Pages: 147-153
  • NAID: 10023936144
• [Journal Article] Starbursting nuclear CO disks of early-type spiral galaxies (2005)
  • Author(s): Koda, J., Kohno, K., 他5名
  • Journal Title: Astronomy and Astrophysics 431 Pages: 887-891
• [Journal Article] Rotating Molecular Gas Associated with a Silhouette Disk at the Center of the Radio Galaxy 3C 31 (2005)
  • Author(s): Okuda, T., Kohno, K., 他2名
  • Journal Title: The Astrophysical Journal 620 Pages: 673-679
• [Journal Article] Starburst at the Expanding Molecular Superbubble in M82:Self-induced Starburst at the Inner Edge of the Superbubble (2005)
  • Author(s): Matsushita, S., Kohno, K., 他5名
  • Journal Title: The Astrophysical Journal 618 Pages: 712-722
• [Journal Article] Cartridge-Type 800 GHz Receiver for the Atacama Submillimeter Telescope Experiment (ASTE) (2004)
  • Author(s): Sugimoto, M., Sekimoto, Y., Kohno, K., 他9名
  • Journal Title: Publications of the Astronomical Society of Japan 56 Pages: 1115-1126
  • NAID: 10023933386
• [Journal Article] Detection of Shocked Molecular Gas by Full-Extent Mapping of the Supernova Remnant W44 (2004)
  • Author(s): Seta, M., Hasegawa, T., Handa, T., 他4名
  • Journal Title: The Astronomical Journal 127 Pages: 1098-1116
• [Presentation] Tracing star formation in galaxies (2007)
  • Author(s): Kohno, Kotaro
  • Organizer: Far-Infrared and Submillimeter Emission of the Interstellar Medium: Models meet extragalactic and Galactic Observations
  • Place of Presentation: Bad Honnef, Germany
  • Year and Date: 2007-11-06
• [Presentation] AzTEC on ASTE Survey of Submillimeter Galaxies (2007)
  • Author(s): Kohno, Kotaro
  • Organizer: 日本天文学会2008年春季年会
  • Place of Presentation: 東京、代々木
• [Presentation] ASTE Dense Gas Imaging Survey of Star-forming Galaxies: ADIoS Project (2007)
  • Author(s): Kohno, Kotaro
  • Organizer: 日本天文学会2008年春季年会
  • Place of Presentation: 東京、代々木
• [Presentation] ミリ波干渉計によるHigh-zQSO BRI1335-0417(z=4.4)の[CI](1-0)輝線探査 (2007)
  • Author(s): 久保井 彬仁
  • Organizer: 日本天文学会2008年春季年会
  • Place of Presentation: 東京、代々木
• [Presentation] CO(1-0) and(3-2) Mapplhg Observations toward Nearby BarredSpiral Galaxy NGC 253 (2007)
  • Author(s): 中西康一郎
  • Organizer: 日本天文学会2008年春季年会
  • Place of Presentation: 東京、代々木
• [Book] 現代の天文学4「銀河」I (2007)
  • Author(s): 土居、河野ほか(共著)
  • Total Pages: 331
  • Publisher: 日本評論社
• [Publications] Kohno, K., Ishizuki, S., Matsushita, S., Vila-Vilaro, B., Kawabe, R.: "Enhanced HCN(1-0) Emission in the Type-1 Seyfert Galaxy NGC 1097"Publ.Astron.Soc.Japan. 55. L1-L5 (2003)
• [Publications] Kohno, K., Vila-Vilaro, B., Sakamoto, S., Kawabe, N., Ishizuki, S., Matsushita, S.: "Aperture Synthesis CO(1-0) Observations and Near-Infrared Phyotometry of the Non-Barred Seyfert Galaxy NGC 5033"Publ.Astron.Soc.Japan. 55. 103-119 (2003)
• [Publications] Sofue Y., Koda, J., Nakanishi, H., Onodera, S., Kohno, K., Tomita, A., Okamura, S..: "The Virgo High Resolution CO Survey : I.CO Atlas"Publ.Astron.Soc.Japan. 55. 17-58 (2003)
• [Publications] Kohno, K. et al.: "Exploreation of Southern Sky with Atacama Submillimeter Telescope Experiment (ASTE)"The 4^<th> Cologne-Zermatt-Bonn Symposium on the Physics and Chemistry of Interstellar Medium. 4(印刷中). (2004)