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Infrared Survey of the Galactic Center with the 1.4-m IRSF telescope at SAAO

Research Project

Project/Area Number 15340061
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionKyoto University (2004-2005)
Nagoya University (2003)

Principal Investigator

NAGATA Tetsuya  Kyoto University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (80208016)

Co-Investigator(Kenkyū-buntansha) SATO Shuji  Nagoya University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (50025483)
SUGITANI Koji  Nagoya City University, Graduate School of Natural Science, Assoc. Professor, システム自然科学研究科, 助教授 (80192615)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥15,600,000 (Direct Cost: ¥15,600,000)
Fiscal Year 2005: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 2004: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 2003: ¥5,900,000 (Direct Cost: ¥5,900,000)
Keywordsoptical infrared telescope / infrared survey / Galactic center / Galaxy / interstellar dust / interstellar extinction / red clump stars / Galactic structure
Research Abstract

Infrared survey of the Galactic center has been performed in the J, H, and K bands with the high resolution of 0.45"/pix. The observed area covers ±1 deg (±150 pc) in the Galactic latitude and ±10 deg (±1.5 kpc) in the Galactic longitude. We used Simultaneous Infrared Imager for Unbiased Survey (SIRIUS) with three 1024x1024 HgCdTe arrays, which were attached to the IRSF 1.4-m telescope placed at South African Astronomical Observatory by Nagoya University. The array read-out has been improved and the efficiency of the observation is now extremely high.
First, using the detected red clump stars in the central degree, which are in the core He burning phase, we determined the interstellar reddening law ; this is different from the color-excess method in the literature, and much more accurate. The interstellar extinction is deviated from the Rieke-Lebofsky law (proportional to the -1.6th order of the wavelength), and rather follows to the -2nd order of the wavelength. It has been sometimes argued that the infrared extinction is "universal" in the various lines of sight, but this result has presented clear evidence against it. The determined index itself is also important in dereddening the observed spectra.
Then, we derived the peak of distribution of red clump stars in the ±1.5 kpc region around the Galactic center. The apparent magnitude peak changes continuously along the Galactic plane, from K=13.4 mag to 12.2 mag after dereddening. This variation is explained by the bar-like structure found in previous studies, but we find an additional inner structure within the region of 1.2 kpc in diameter, where the apparent magnitude peak changes by only 0.1 mag.

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (29 results)

All 2006 2005 2004 2003 Other

All Journal Article (24 results) Publications (5 results)

  • [Journal Article] Interstellar Extinction Law in the J, H, and Ks Bands toward the Galactic Center2006

    • Author(s)
      Nishiyama, S. 他
    • Journal Title

      Astrophysical Journal 638

      Pages: 838-846

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Near-infrared study of CIZA J1324.7-5736, the second richest cluster of galaxies in the Great Attractor2006

    • Author(s)
      Nagayama, T. 他
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 368

      Pages: 534-543

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The Distance to the Galactic Center Derived From Infrared Photometry of Bulge Red Clump Stars2006

    • Author(s)
      Nishiyama, S. 他
    • Journal Title

      Astrophysical Journal (印刷中)

      Pages: 2006-2006

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Interstellar Extinction Law in the J, H, and Ks Bands toward the Galactic Center2006

    • Author(s)
      Nishiyama, S., et al.
    • Journal Title

      Astrophysical Journal 638

      Pages: 839-846

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Near-infrared study of CIZA J1324.7-5736, the second richest cluster of galaxies in the Great Attractor2006

    • Author(s)
      Nagayama, T., et al.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 368,2

      Pages: 534-543

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The Distance to the Galactic Center Derived From Infrared Photometry of Bulge Red Clump Stars2006

    • Author(s)
      Nishiyama, S., et al.
    • Journal Title

      Astrophysical Journal (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Interstellar Extinction Law in the J, H, and Ks Bands toward the Galactic Center2006

    • Author(s)
      Nishiyama, S.
    • Journal Title

      Astrophysical Journal 638

      Pages: 839-846

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Near-Infrared Extinction Law in the ρ Ophiuchi and Chamaeleon Dark Clouds2006

    • Author(s)
      Naoi, T.
    • Journal Title

      Astrophysical Journal 640

      Pages: 373-382

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Near-Infrared Imaging Observations of the N159/N160 Complex in the Large Magellanic Cloud : Large Clusters of Herbig Ae/Be Stars and Sequential Cluster Formation2005

    • Author(s)
      Nakajima, Y. 他
    • Journal Title

      Astronomical Journal 129

      Pages: 776-789

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] A Distinct Structure inside the Galactic Bar2005

    • Author(s)
      Nishiyama, S, 他
    • Journal Title

      Astrophysical Journal 621

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Near-Infrared Imaging Observations of the N159/N160 Complex in the Large Magellanic Cloud : Large Clusters of Herbig Ae/Be Stars and Sequential Cluster Formation2005

    • Author(s)
      Nakajima, Y., et al.
    • Journal Title

      Astronomical Journal 129

      Pages: 776-789

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] A Distinct Structure inside the Galactic Bar2005

    • Author(s)
      Nishiyama, S., et al.
    • Journal Title

      Astrophysical Journal 621

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] V1647 Orionis(IRAS 05436-0007):A New Look at McNeil's Nebula2005

    • Author(s)
      Ojha, D.
    • Journal Title

      Publications of the Astronomical Society of Japan 57

      Pages: 203-210

    • Related Report
      2005 Annual Research Report
  • [Journal Article] TRISPEC : A Simultaneous Optical and Near-Infrared Imager, Spectrograph, and Polarimeter2005

    • Author(s)
      Watanabe, M.
    • Journal Title

      The Publications of the Astronomical Society of the Pacific 117

      Pages: 870-884

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Near-Infrared Photometric Monitoring of the Pre-Main-Sequence Object KH 15D2005

    • Author(s)
      Kusakabe, N.
    • Journal Title

      Astrophysical Journal 632

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Near-Infrared Imaging Survey of Bok Globules : Density Structure2005

    • Author(s)
      Kandori, R.
    • Journal Title

      Astronomical Journal 130

      Pages: 2166-2184

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Near-Infrared Imaging Observations of the N159/N160 Complex in the Large Magellanic Cloud : Large Clusters of Herbig Ae/Be Stars and Sequential Cluster Formation2005

    • Author(s)
      Nakajima, Y.他
    • Journal Title

      Astronomical Journal 129

      Pages: 776-789

    • Related Report
      2004 Annual Research Report
  • [Journal Article] A Distinct Structure inside the Galactic Bar2005

    • Author(s)
      Nishiyama, S.他
    • Journal Title

      Astrophysical Journal 621

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Variable stars in the Magellanic Clouds-II. The data and infrared properties2004

    • Author(s)
      Ita, Y.他
    • Journal Title

      Monthly Notices of Royal Astronomical Society 353

      Pages: 705-712

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Deep Near-Infrared Imaging toward the Vela Molecular Ridge C.I.A Remarkable Embedded Cluster in RCW 362004

    • Author(s)
      Baba, D.他
    • Journal Title

      Astrophysical Journal 614

      Pages: 818-826

    • Related Report
      2004 Annual Research Report
  • [Journal Article] A deep near-infrared survey around the giant radio galaxy PKS 1343-6012004

    • Author(s)
      Nagayama, T.他
    • Journal Title

      Monthly Notices Royal Astronomical Society 354

      Pages: 980-990

    • Related Report
      2004 Annual Research Report
  • [Journal Article] A Near-Infrared Study of the NGC 7538 Star-forming Region2004

    • Author(s)
      Ojha, D.K.他
    • Journal Title

      Astrophysical Journal 616

      Pages: 1042-1057

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Simultaneous Optical and Near-Infrared Spectropolarimetry of Type 2 Seyfert Galaxies2003

    • Author(s)
      Watanabe, M., 他
    • Journal Title

      Astrophysical Journal 591

      Pages: 714-732

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Simultaneous Optical and Near-Infrared Spectropolarimetry of Type 2 Seyfert Galaxies2003

    • Author(s)
      Watanabe, M., et al.
    • Journal Title

      Astrophysical Journal 591

      Pages: 714-732

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Publications] Watanabe, M.: "Simultaneous Optical and Near-Infrared Spectropolarimetry of Type 2 Seyfert Galaxies"Asteophys.J.. 591. 714-732 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Nagashima, C.: "An Optical and Near Infrared Search for Brown Dwarfs in the Pleiades Cluster"Mon.Not.R.Astron.Soc. 343. 1263-1270 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Jiang, Z.: "A Near Infrared Study of the Star Forming Region S269"Astrophys.J.. 596. 1064-1079 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Nagata, T.: "The Infrared Counterpart of the X-Ray Nova XTEJ1720-318"Publ.Astron.Soc.Japan. 55. L73-L76 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Ita, Y.: "Variable stars in the Magellanic Clouds : results from OGLE and SIRIUS"Mon.Not.R.Astron.Soc. 347. 720-728 (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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