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1991 Fiscal Year Final Research Report Summary

Galaxy Collision as an Origin of SO Galaxies

Research Project

Project/Area Number 02302013
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionTOHOKU UNIVERSITY (1991)
The University of Tokyo (1990)

Principal Investigator

TANIGUCHI Yoshiaki  Tohoku University,Faculty of Science Associate Professor, 理学部, 助教授 (40192637)

Co-Investigator(Kenkyū-buntansha) TOSA Makoto  Tohoku University,Faculty of Science Professor, 理学部, 教授 (50022728)
WAKAMATSU Kenichi  Gifu University,General Education Professor, 教養部, 教授 (30021801)
SOFUE Yoshiaki  Tokyo University,Faculty of Science Professor, 理学部, 教授 (10022667)
FUJIMOTO Mitsuaki  Nagoya University,Faculty of Science Professor, 理学部, 教授 (70022580)
ISHIDA Keiichi  Tokyo University,Faculty of Science Professor, 理学部, 教授 (80012839)
Project Period (FY) 1990 – 1991
KeywordsGalaxies / Bulges / Galactic Nuclei / Active Galactic Nuclei / Star Formation / Stellar Dynamics
Research Abstract

In order to understand the origin of SO galaxies, we have comprehensively summarized observational properties of SO galaxies as well as elliptical and spiral galaxies. This comparative study reveals the following important observational properties of SO galaxies: (a) Morphological properties of SO galaxies shows a number of unusual features such as ripples, dust lanes, polar rings, and so on. Further, disks of SO galaxies are kinematically hot, being suggested by the absence of spiral arms. There are many of lines of evidence for large star formation events about a few Gyr ago. These properties are considered to be related to second events such as galaxy-galaxy collisions. (b) The luminosities and the masses of SO galaxies are not intermediate between those of elliptical and spiral galaxies. Therefore, it is unlikely that SO galaxies do not correspond to the transition class between elliptical and spiral galaxies.
Taking account of the above observational results, we propose the following senario for the formation and evolution of SO galaxies. (1) Second events (mergers and galaxy-galaxy collisions) occurred 10^<10> years ago built most of elliptical and bulges of SO galaxies. These second events are considered to a triggering mechanism of nuclear starburst activity. (2) Second events occurred in about 10^9 years ago made various fine structures which are observed in nearby galaxies. These events selectively affected on structures of cool-gas poor stellar systems (i.e., ellipticals and SO galaxies). In some cases, the second events triggered bar instability in disk galaxies. These bar structures would be considered to be destroyed and be evolved to puff up the bulges. Namely, evolutionary processes in disk galaxies should go from late-type to early-type disk galaxies.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 谷口 義明: "Circumnuclear Moleculer Gas in Seyfert Galaxces" The Astrophysical Journal. 358. 132-138 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 谷口 義明: "Wing Galexies:A Formation Mechanism of the Clumpy Irregular Galaxy Markarian 297" The Astronomical Journal. 101. 1601-1608 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 毛利 英明: "Origin of For-Infrared Emission in Seyfert and Starburst Galaxies" The Astrophysical Journal. 386. 68-82 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤本 光昭: "Asymmetric Distribution of Gas in the Large Magellanic Cloud and Dynamical Condition for Globular Cluster Formation" Publication of the Astronomical Society of Japan. 42. 505-516 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 千葉 柾司: "Spiral-Arm Resonance in Galactic Dynamos" Monthly Notices of Royal Astronomical Society. 250. 769-779 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 祖父江 義明: "Formation of Galactic Bulges by Starburst and Hubble Morphological Seguence" Publication of Astronomical Society of Japan. 44. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] TANIGUCHI, Y., ICHIKAWA, S., HAMABE, M., YAMAGATA, T., AND IYE, M.: "Shell Structure Associated with the Starburst Galaxy Markarian 717" Astr. AP. 233. 385-390 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] MOURI, H., KAWARA, K., TANIGUCHI, T., AND NISHIDA, M.: "A Relation Between H_2v=1-0S(1)and 3.28 um Emission in Seyfert and Starburst Galaxies" Astrophys. J. (Letters). 356. 39-42 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] TANIGUCHI, Y., KAMEYA, O., NAKAI, N., AND KAWARA, K.: "Circumnuclear Molecular Gas in Seyfert Galaxies" Astrophys.358. 132-138 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] MOURI, H., NISHIDA, M., TANIGUCHI, Y., AND KAWARA, K.: "Excitation Mechanism of Infrared [Fell] 1.644 Micron Emission in Seyfert and starburst Galaxies" Astrophys.360. 55-62 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] SOFUE, Y., TANIGUCHI, Y., WAKAMATSU, K., NAKAI, N., HANDA, T., FUJISAWA, K., AND YASUDA, N.: "CO-line Emission from the Clumpy Irregular Galaxy Markarian 297" Pud. A. S. Japan(Letters). 42. 45-51 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] TANICUCHI, Y., NAKAI, N., SOFUE, Y., AND WAKAMATSU, K.: "CO Emission in the Polar Rung SO Galaxy NGC 2685 and Origin of the Ring Structure" Astron.J. 100. 1086-1090 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] OHSAWA, T., TANIGUCHI, Y., AND KOSAI, H.: "Is the Supernova 1950E a Supernova?" Pub. A. S. Japan. 42. 597-600 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] KAWARA, K., TANIGUCHI, Y., NAKAI, N., AND SOFUE, Y.: "CO Emission from the Nucleus of Infrared Galaxy NGC 4418: An Early AGN Phase?" Astrophys J.(Letters). 365. 1-3 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] TANIGUCHI, Y., TAKATO, N., AND AOKI, T.: "A New Candidate of Merger: NGC 3597" Pub A. S. Japan. 42. 819-825 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] TANIGUCHI, Y., AND NOGUCHI, M.: "Wing Galaxies: A Formation Mechanism of Clumpy Irregular Galaxy Markarian 297" Astron J. 101. 1601-1608 (1991)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1994-03-18  

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