| Project/Area Number |
10304014
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | The University of Tokyo |
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Principal Investigator |
YOSHII Yuzuru Graduate School of Science, The University of Tokyo, Professor, 大学院・理学系研究科, 教授 (00158388)
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| Co-Investigator(Kenkyū-buntansha) |
MIYAZAKI Satoshi National Astronomical Observatory, Advanced Technology Center, Research Associate, 天文機器開発実験センター, 助手 (20290885)
KAWARA Kimiaki Graduate School of Science, The University of Tokyo, Associate Professor, 大学院・理学系研究科, 助教授 (50292834)
KOBAYASHI Yukiyasu National Astronomical Observatory, Div. of Optical & Infrared Astronomy, Professor, 光学赤外線天文学・観測システム研究系, 教授 (50170361)
MINEZAKI Takeo Graduate School of Science, The University of Tokyo, Research Associate, 大学院・理学系研究科, 助手 (60292835)
AOKI Tsutomu Graduate School of Science, The University of Tokyo, Research Associate, 大学院・理学系研究科, 助手 (10251414)
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| Project Period (FY) |
1998 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥37,080,000 (Direct Cost: ¥35,100,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2001: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2000: ¥5,700,000 (Direct Cost: ¥5,700,000)
Fiscal Year 1999: ¥7,800,000 (Direct Cost: ¥7,800,000)
Fiscal Year 1998: ¥15,000,000 (Direct Cost: ¥15,000,000)
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| Keywords | Observational Cosmology / Active Galactic Nuclei / Time Variability / Cosmic Dust / Infrared Instrumentation / Automatic Observation / 赤外線観測 / 自動天文観測 |
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| Research Abstract |
It is difficult to determine the cosmological parameters by the classical methods based on the optical-infrared observation of distant galaxies, because the effect of the cosmic expansion and the galaxy evolution is mixed and difficult to distinguish. We proposed a new method to measure the luminosity distance of remote galaxies, which is independent of and overcomes the galaxy evolution effect. The proposed method is as follows:
At first, a lag from the optical variability to the infrared variability of an active galactic nucleous (AGN) is measured (the dust reverberation method). Then, the UV/optical absolute magnitude can be estimated from the measured lag because a luminous AGN have a large dust torus and therefore have a large lag. At last comparing the absolute and apparant magnitude of the AGN, we can measure the luminosity distance. In order to establish and apply the method, we prepared a 2 m telescope dedicated to monitoring AGNs at the Haleakala observatories at Maui island, and started the observation from fiscal 2000. The lags between the optical variability and infrared variability of NGC 4151 and some other nearby AGNs was measured accurately than ever from the pilot observation, therefore the method we proposed can be concluded promising. We are going to start the frequent monitor of lots of AGNs to be continued several years, and will construct the largest optical and infrared variability database of AGNs.
1. A new galaxy evolution model was constructed with the recent observational results of galaxies, and determine the cosmological parameters using the classical methods (m-z, theta-z, number count) concerning with the evolution effect estimated by the new model.
2. We argued that the extremely red objects found in SDF is dust enshrouded forming elliptical galaxies, and compared the observation with the theoretical galaxy formation processes.
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