1988 Fiscal Year Final Research Report Summary
An Investigation of Physical Factors that Determine Galaxy Structure Based upon a New Method of Quantitative Analysis.
| Project/Area Number |
59065002
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| Research Category |
Grant-in-Aid for Specially Promoted Research
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| Allocation Type | Single-year Grants |
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| Research Institution | National Astronomical Observatory |
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Principal Investigator |
KODAIRA Keiichi Optical and Infrared Astronomy Division, National Astronomical Observatory, Professor, 光学赤外線天文学研究系, 教授 (60012845)
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| Co-Investigator(Kenkyū-buntansha) |
OKAMURA Sadanori Institute of Astronomy, The University of Tokyo, Associate Professor, 理学部天文学教育研究センター, 助教授 (20114423)
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| Project Period (FY) |
1984 – 1988
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| Keywords | Galaxies / Quantitative Analysis / Image Processing / 宇宙論 |
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| Research Abstract |
The aim of the project is to understand what physical factors are responsible for the wide variety of galaxy structure on the basis of quantitative analyses of a large number of galaxy images. Results of this 5-year project are summarized as follows.
1. Investigation of Galaxy Structure. We have found that (1) the number of physical factors that determine the global structure of galaxies is two, (2) the leading factor which is responsible for the wide variety of galaxian shape is the structure of the spheroidal component rather than that of the disk component, and (3) there is a well-bahaved correlation between the total luminosity of galaxies and the average phase-space density. The last correlation will ne a powerful tool to understand the mechanism of galaxy formation in the presence of dark matter. (4) Several problems related to the quantitative analyses have been studied in some detail. They include internal absorption, ultraviolet rediation, and peculiarity of galaxies, and image processing technique.
2. Database of Galaxies A database has been constructed which includes two-dimensional luminosity distribution of about 800 galaxies. The detabase will be distributed on the world-wide basis to those who are interested in it.
3. Astronomical Image Data Processing System. An efficient astronomical image data processing system has been developed on a dedicated superminicomputer with a variety of image I/O peripherals. A photographic plate scanning machine was introduced and has been successfully operated as an integral part of the system.
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