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Multicolor Active Galactic Nuclei Monitoring

Research Project

Project/Area Number 10304014
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionThe University of Tokyo

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)

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)
Project Period (FY) 1998 – 2001
Project Status Completed (Fiscal Year 2001)
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)
KeywordsObservational Cosmology / Active Galactic Nuclei / Time Variability / Cosmic Dust / Infrared Instrumentation / Automatic Observation / 赤外線観測 / 自動天文観測
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.

Report

(5 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (36 results)

All Other

All Publications (36 results)

  • [Publications] Minezaki, T.: "K-Band Galaxy Counts in the South Galactic Pole Region"The Astrophysical Journal. v.494. 111-117 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Minezaki, T.: "The interpretation of near-infrared star counts at the South Galactic Pole"The Astronomical Journal. v.115. 229-233 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Enya, K.: "JHK' Imaging Photometry of Seyfert 1 Active Galactic Nuclei and Quasars. I. Multiaperture Photometry"The Astrophysical Journal Supplement Series. v.141. 23-29 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Enya, K.: "JHK' Imaging Photometry of Seyfert 1 Active Galactic Nuclei and Quasars. II. Observation of Long-Term Variability"The Astrophysical Journal Supplement Series. v.141. 31-44 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Enya, K.: "JHK' Imaging Photometry of Seyfert 1 Active Galactic Nuclei and Quasars. III. Variability of Radio-Quiet and Radio-Loud Active Galactic Nuclei"The Astrophysical Journal Supplement Series. v.141. 45-59 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yoshii, Y.: "MAGNUM Project AGN Variability as a New Technique for Distance Determination"New Trends in Theoretical and Observational Cosmology (eds. Sato, K. and Shiromizu, T.). 235-244 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Minezaki, T.: "K-Band Galaxy Counts in the South Galactic Pole Region"The Astrophysical Journal. v.494. 111-117 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Minezaki, T.: "The interpretation of near-infrared star counts at the South Galactic Pole"The Astronomical Journal. v.115. 229-233 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Enya, K.: "JHK' Imaging Photometry of Seyfert 1 Active Galactic Nuclei and Quasars. I. Multiaperture Photometry"The Astrophysical Journal Supplement Series. v.141. 23-29 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Enya, K.: "JHK' Imaging Photometry of Seyfert 1 Active Galactic Nuclei and Quasars. II. Observation of Long-Term Variability"The Astrophysical Journal Supplement Series. v.141. 31-44 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Enya, K.: "JHK' Imaging Photometry of Seyfert 1 Active Galactic Nuclei and Quasars. III Variability of Radio-Quiet and Radio-Loud Active Galactic Nuclei"The Astrophysical Journal Supplement Series. v.141. 45-59 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yoshii, Y.: "MAGNUM Project: AGN Variability as a New Technique for Distance Determination"New Trends in Theoretical and Observational Cosmology (eds. Sato, K. and Shiromizu, T.). 235-244 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Suzuki, T.K.: "A New Model for the Evolution of Light Elements in an Inhomogeneous Galactic Halo"The Astrophysical Journal. v.549. 303-319 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Totani, T.: "Diffuse Extragalactic Background Light versus Deep Galaxy Counts in the Subaru Deep Field: Missing Light in the Universe?"The Astrophysical Journal. v.550. L137-L141 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Totani, T.: "Near Infrared Faint Galaxies in the Subaru Deep Field : Confronting the Theory with Observations for Galaxy Counts, Colors, and Size Distributions to K〜24.5"The Astrophysical Journal. v.559. 592-605 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Totani, T.: "Hyper-Extremely Red Objects in the Subaru Deep Field : Evidence for Primordial Elliptical Galaxies in Dusty Starburst Phase"The Astrophysical Journal. v.558. L87-L91 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Nagashima, M.: "Galaxy Number Counts in the Hubble Deep Field as a Strong Constraint on a Hierarchical Galaxy Formation Model"The Astrophysical Journal. v.557. 505-518 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yahagi, H.: "N-Body Code with Adaptive Mesh Refinement"The Astrophysical Journal. v.558. 463-475 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Mori,M.: "Dissipative Process as a Mechanism of Differentiating Internal Structures between Dwarf and Normal Elliptical Galaxies in a Cold Dark Matter universe"Astrophysical Journal. v.511. 585-594 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] Tsujimoto,T.: "Chemical Evolution of the Galactic Halo through Supernova-induced Star Formation and Its Implication for Population III Stars"Astrophysical Journal Letters. v.519. 63-67 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] Suzuki,T.K.: "Evolution of Beryllium and Boron in the Inhomogeneous Early Galaxy"Astrophysical Journal Letters. v.522. 125-128 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] Tsujimoto,T.: "Probing the Site for R-Process Nucleosynthesis with Abundances of Barium and Magnesium in Extremely Metal-poor Stars"Astrophysical Journal. v.531. L33-L36 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Suzuki,T.K.: "Primordial Lithium Abundance as a Stringent Constraint on the Baryonic Content of the Universe"Astrophysical Journal. v.540. 99-103 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Totani,T.: "Unavoidable Selection Effects in the Analysis of Faint Galaxies in the Hubble Deep Field : Probing the Cosmology and Merger History of Galaxies"Astrophysical Journal. v.540. 81-98 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Yahagi, H.: "The forest method as a new parallel tree method with the section voronoi tessellation"Astrophysical Journal Supplement. v.124. 1-9 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Chiba, M.: "New limits on a cosmological constant from statistics of gravitational lensing"Astrophysical Journal. v.510. 42-53 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Mori, M.: "Dissipative process as a mechanism of defferentiating internal structures between dwarf and normal elliptical galaxies in a cold dark matter universe"Astrophysical Journal. v.511. 585-594 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Tsujimoto, T.: "Chemical evolution of the galactic halo through supernova induced star formation and its implication for population III stars"Astrophysical Journal Letters. v.519. 63-67 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Suzuki, T. K.: "Evolution of beryllium and boron in the inhomogeneous earlygalaxy"Astrophysical Journal Letters. v.522. 125-128 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Tujimoto, T.: "Probing the Site for R-Process Nucleosynthesis with Abundances of Barium and Magnesium in Extremelly Metal poor Stars"Astrophysical Journal. v.531. 33-36 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Chiba, M.: "Early Evolution of the Galactic Halo Revealed from Hipparcos Observations of Metal-Poor Stars" Astronomical Journal. v.115. 168-192 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Minezaki, T.: "The Interpretation of Near-Infrared Star Counts at the South Galactic Pole" Astronomical Journal. v.115. 229-233 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Minezaki, T.: "K-Band Galaxy Counts in the South Galactic Pole Region" Astrophysical Journal. v.494. 111-117 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Yoshii, Y.: "Age Dating of a High-Redshift QSO B1422+231 at Z=3.62 and Its Cosmological Imprications" Astrophysical Journal Letters.v.507. 113-116 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Chiba, M.: "New Limits on a Cosmological Constant from Statistics of Gravitational Lensing" Astrophysical Journal Letters. v.510. 42-53 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Mori, M.: "Dissipative Process as a Mechanism of Differentiating Internal Structures between Dwarf and Normal Elliptical Galaxies in a Cold Dark Matter Universe" Astrophysical Journal Letters. v.511. 585-594 (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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