赤外線衛星「あかり」(ASTRO-F)による大質量銀河形成過程の解明

• Project/Area Number: 06J07747
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 国内
• Research Field: Astronomy
• Research Institution: Japan Aerospace Exploration Agency
• Principal Investigator: 高木 俊暢 Japan Aerospace Exploration Agency, 宇宙科学研究本部, 特別研究員(PD)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,300,000 (Direct Cost: ¥3,300,000); Fiscal Year 2008: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2007: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 2006: ¥1,100,000 (Direct Cost: ¥1,100,000)
• Keywords: 赤外線天文学 / 赤外線銀河 / 銀河進化 / 星間ダスト

Research Abstract

「あかり」衛星による連続体な近-中間赤外線による測光観測結果を用いることにより、多環芳香族炭化水素(PAH)による特徴的な放射特性を捉えられることを示した。つまり、「あかり」衛星では、PAH放射が強い銀河を、分光せずとも、測光観測のみで同定することができる。この特徴を活かし、私たちは、PAH放射の強い銀河を同定する方法を確立した。この方法では、7および11μm、または、9および15μmで定義される色で、非常に赤くなる天体に注目する。この色は、フラックス比で8倍に相当し、活動銀河核やその他PAH以外の放射特性では再現できない色である。つまり、これら赤外線で明るいPAH銀河は、AGNではなく、純粋に爆発的な星生成活動によって明るくなっている天体と考えられる。近傍では、赤外線光度が10^<12>太陽光度を超える超光度赤外線銀河は、全赤外線光度に比べて、PAH放射が弱く、AGNの全光度への寄与、または、PAH放射のダストによる吸収があると考えられる。一方、「あかり」で見つかった赤方偏移1付近のPAH銀河は。超光度赤外線銀河でありながら.PAH放射が強く、中間赤外線でのスペクトル特性は、純粋なより小規模な爆発的星生成銀河のそれと矛盾しないことを示した。

Research Products

• [Journal Article] A close relationship at z〜2 : submillimetre galaxies and BzK-selected galaxies (2008)
  • Author(s): T. Takagi, et al.
  • Journal Title: Monthly Notice of Royal Astronomical Society 389 Pages: 775-786
  • Peer Reviewed
• [Journal Article] Galaxy clusters at 0. 9<z<1. 7 in the AKARI NEP deep field (2008)
  • Author(s): T. Goto, et al.
  • Journal Title: Publication of Astronomical Society of Japan 60
  • Peer Reviewed
• [Journal Article] AKARI/IRC Deep Survey in the North Ecliptic Pole Region (2008)
  • Author(s): T. Wada, et al.
  • Journal Title: Publication of Astronomical Society of Japan 60
  • Peer Reviewed
• [Journal Article] Mapping dusty star formation in and around a cluster at z=0.81 by wide-field imaging with AKARI (2008)
  • Author(s): Koyama, et al.
  • Journal Title: Monthly Notice of Royal Astronomical Society 391 Pages: 1758-1770
  • Peer Reviewed
• [Journal Article] Multi-wavelength analysis of 18μm-selected galaxies in the AKARI/IRC monitor field towards the north ecliptic pole (2007)
  • Author(s): T. Takagi, et. al.
  • Journal Title: Publication of the Astronomical Society of Japan 59
  • Peer Reviewed
• [Journal Article] The SCUBA Half Degree Extragalactic Survey(SHADES)-V. Submillimetre properties of near-infrared-selected galaxies in the SXDF (2007)
  • Author(s): T. Takagi, et. al.
  • Journal Title: Monthly Notice of Royal Astronomical Society 381 Pages: 1154-1168
  • Peer Reviewed
• [Journal Article] Detection of an H-alpha emission line on a Quasor, RX1759.4+6638, at z=4.3 with AKARI (2007)
  • Author(s): S. Oyabu, et. al.
  • Journal Title: Publication of the Astronomical Society of Japan 59
  • Peer Reviewed
• [Journal Article] Near-infrared and Mid-infrared Spectroscopy with the Infrared Camera(IRC)for AKARI (2007)
  • Author(s): Y. Ohyama, et. al.
  • Journal Title: Publication of the Astronomical Society of Japan 59
  • Peer Reviewed
• [Journal Article] Nature of Infrared Sources in 11 μm Selected Sample from Early Data of NEP Deep Survey (2007)
  • Author(s): H. M. Lee, et. al.
  • Journal Title: Publication of the Astronomical Society of Japan 59
  • Peer Reviewed
• [Journal Article] AKARI far-infrared source counts in the Lockman Hole (2007)
  • Author(s): S. Matsuura, et. al.
  • Journal Title: Publication of the Astronomical Society of Japan 59
  • Peer Reviewed
• [Journal Article] The Infrared Astronomical Mission AKARI (2007)
  • Author(s): H. Murakami, et. al.
  • Journal Title: Publication of the Astronomical Society of Japan 59
  • Peer Reviewed
• [Journal Article] The Far-Infrared Surveyor(FIS)for AKARI (2007)
  • Author(s): M. Kawada, et. al.
  • Journal Title: Publication of the Astronomical Society of Japan 59
  • Peer Reviewed
• [Journal Article] The Far-Infrared Properties of Spatially Resolved AKARI Observations (2007)
  • Author(s): W.-S. Jeong, et. al.
  • Journal Title: Publication of the Astronomical Society of Japan 59
  • Peer Reviewed
• [Journal Article] AKARI Observations of Circumstellar Dust in the Globular Clusters NGC 104 and NGC 362 (2007)
  • Author(s): Y. Ita, et. al.
  • Journal Title: Publication of the Astronomical Society of Japan 59
  • Peer Reviewed
• [Journal Article] AKARI Infrared Imaging of Reflection Nebulae IC4954 and IC4955 (2007)
  • Author(s): D. Ishihara, et. al.
  • Journal Title: Publication of the Astronomical Society of Japan 59
  • Peer Reviewed
• [Journal Article] Properties of UIR Bands in NGC6946 Based on Mid-Infrared Imaging and Spectroscopy with Infrared Camera on Board AKARI (2007)
  • Author(s): I. Sakon, et. al.
  • Journal Title: Publication of the Astronomical Society of Japan 59
  • Peer Reviewed
• [Journal Article] Infrared Camera(IRC)Deep Survey in the Performance Verification Phase (2007)
  • Author(s): T. Wada, et. al.
  • Journal Title: Publication of the Astronomical Society of Japan 59
  • Peer Reviewed
• [Journal Article] Optical Identification of 15μm Sources in the AKARI Performance Verification Field toward the North Ecliptic Pole (2007)
  • Author(s): H. Matsuhara, et. al.
  • Journal Title: Publication of the Astronomical Society of Japan 59
  • Peer Reviewed
• [Journal Article] An Optical Source Catalog of the North Ecliptic Pole Region (2007)
  • Author(s): N. Hwang, et. al.
  • Journal Title: Astrophysical Journal Supplement 172 Pages: 583-598
  • Peer Reviewed
• [Journal Article] J- and Ks-band Galaxy Counts and Color Distributions in the AKARI North Ecliptic Pole Field (2007)
  • Author(s): K. Imai, et. al.
  • Journal Title: Astronomical Journal 133 Pages: 2418-2428
  • Peer Reviewed
• [Journal Article] Mid- to Far-Infrared Spectral Energy Distribution of the Diffuse Galactic Radiation (2007)
  • Author(s): T. Onaka, et. al.
  • Journal Title: Astrophysical Journal 654 Pages: 844-857
  • Peer Reviewed
• [Journal Article] Galaxy counts in the AKARI deep SEP survey (2007)
  • Author(s): C. Pearson, et. al.
  • Journal Title: Advances in Space Research 40 Pages: 605-611
  • Peer Reviewed
• [Journal Article] In orbit focal adjustment of the AKARI telescope with IRC images
  • Author(s): H.Kaneda, et al.
  • Journal Title: Publication of the Astronomical Society of Japan (Accepted)
• [Journal Article] The Infrared Camera (IRC) for AKARI - design and imaging performance
  • Author(s): T.Onaka, et al.
  • Journal Title: Publication of the Astronomical Society of Japan (Accepted)
• [Presentation] 「あかり」で探る特殊な遠方赤外線銀河:PAH-luminous galaxies-II (2009)
  • Author(s): 高木俊暢, 他
  • Organizer: 2009年春季天文学会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2009-03-11
• [Presentation] The AKARI extragalactic large area survey towards the North Ecliptic Pole (2009)
  • Author(s): T. Takagi, et al.
  • Organizer: The 1st AKARI international conference
  • Place of Presentation: 東京大学
  • Year and Date: 2009-02-16
• [Presentation] サブミリ銀河とBzK銀河の密接な関係 (2008)
  • Author(s): 高木俊暢, 他
  • Organizer: 2008年秋季年天文学会
  • Place of Presentation: 岡山理科大学
  • Year and Date: 2008-09-11
• [Presentation] 「あかり」で探る特殊な遠方赤外線銀河: PAH-luminous galaxies (2008)
  • Author(s): 高木 俊暢
  • Organizer: 日本天文学会
  • Place of Presentation: 国立オリンピック記念青少年総合センター
  • Year and Date: 2008-03-24
• [Presentation] AKARI cosmological surveys: initial results and new capabilities (2007)
  • Author(s): T. Takagi, et. al.
  • Organizer: The 1st Subaru International Conference, "Panoramic Views of Galaxy Formation and Evolution"
  • Place of Presentation: 湘南国際村