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Establishing the zero point of near infrared photometry and the calibration of a standard star network

Research Project

Project/Area Number 15K05019
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Astronomy
Research InstitutionThe University of Tokyo

Principal Investigator

FUKUGITA Masataka  東京大学, カブリ数物連携宇宙研究機構, 上級科学研究員 (40100820)

Co-Investigator(Kenkyū-buntansha) 鈴木 尚孝  東京大学, カブリ数物連携宇宙研究機構, 特任助教 (20722804)
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Keywordsnear infrared / AB magnitude / zero point / black-body stars / AB magnitude zero point / black body stars / cosmic dust / heavy metal abundance / Mg II clouds / galactic winds / DLA
Outline of Final Research Achievements

In the quasar target-candidate catalogue in SDSS we noted one object that shows a spectrum, without any spectral features but being close to the blackbody radiation. We then serached through the entire spectral catalogue of SDSS of 800000 objects, we found 17 similar objects. We called them "blackbody stars" (Suzuki and Fukugita 2018), and speculated them being DB white dwarfs. Afterwards, GAIA published a catalogue of nearby stars. Searching through this catalogue, we found that they are stars at 70-220 pc. Using the atmosphere model, we showed that helium atmosphere emits a spectrum close to blackbody if its temperaure is 7000 -12000K. Indeed, all blackbody stars lie in this range. We conclude that all aspects are consistent with DB white dwarfs. (Serenelli, Rohrmann, and Fukugita 2019). These blackbody stars can be used as the flux standard through the entire range of the wavelength, including near infrared regions (Fukugita 2019).

Academic Significance and Societal Importance of the Research Achievements

赤外領域での光束のcgs系での標準値は実験室での光束標準の測定がない故,存在しない。我々の與へた黒色輻射星は赤外を含む全波長領域での標準星として利用出来る筈である。尚、天軆物理學の知見には世俗的な利用価値のあるものはない。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (12 results)

All 2019 2018 2017 2015 Other

All Int'l Joint Research (2 results) Journal Article (9 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 9 results,  Open Access: 8 results,  Acknowledgement Compliant: 2 results) Presentation (1 results)

  • [Int'l Joint Research] Institute for Advanced Study(米国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Princeton University/Johns Hopkins University/Institute for Advanced Study(U.S.A.)

    • Related Report
      2015 Research-status Report
  • [Journal Article] Discovery of blackbody stars and the accuracy of photometric calibration, Highlights of Astronomy2019

    • Author(s)
      M. Fukugita
    • Journal Title

      IAU General Assembly Wien 2018: FM12

      Volume: Vol.18

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Nature of blackbody stars2019

    • Author(s)
      Serenelli Aldo、Rohrmann Renmann D.、Fukugita Masataka
    • Journal Title

      Astronomy & Astrophysics

      Volume: 623 Pages: A177-A177

    • DOI

      10.1051/0004-6361/201834032

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Energetics of high-energy cosmic radiations2019

    • Author(s)
      Murase Kohta、Fukugita Masataka
    • Journal Title

      Physical Review D

      Volume: 99 Issue: 6 Pages: 063012-063012

    • DOI

      10.1103/physrevd.99.063012

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Blackbody Stars2018

    • Author(s)
      Suzuki Nao、Fukugita Masataka
    • Journal Title

      The Astronomical Journal

      Volume: 156 Issue: 5 Pages: 219-219

    • DOI

      10.3847/1538-3881/aac88b

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Black-Body Stars2017

    • Author(s)
      N. Suzuki and M. Fukugita
    • Journal Title

      Astron J

      Volume: -

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The extended ROSAT-ESO Flux-Limited X-ray Galaxy Cluster Survey (REFLEX II)2017

    • Author(s)
      Boehringer Hans、Chon Gayoung、Fukugita Masataka
    • Journal Title

      ASTRONOMY & ASTROPHYSICS

      Volume: 608 Pages: A65-A65

    • DOI

      10.1051/0004-6361/201731205

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Mg II Absorbers: Metallicity Evolution and Cloud Morphology2017

    • Author(s)
      Lan Ting-Wen、Fukugita Masataka
    • Journal Title

      The Astrophysical Journal

      Volume: 850 Issue: 2 Pages: 156-156

    • DOI

      10.3847/1538-4357/aa93eb

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] CP violating phase from minimal texture neutrino mass matrix: Test of the phase relevant to leptogenesis2017

    • Author(s)
      Masataka Fukugita, Yuya Kaneta, Yusuke Shimizu, Morimitsu Tanimoto, Tutomu T. Yanagida
    • Journal Title

      Physics Letters B

      Volume: 764 Pages: 163-166

    • DOI

      10.1016/j.physletb.2016.11.024

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] The Nature of damped Lyman-\alpha and MgII absorbers explored through their dust contents2015

    • Author(s)
      M. Fukugita and B. Menard
    • Journal Title

      Astrophys. J

      Volume: 799:195 Issue: 2 Pages: 195-195

    • DOI

      10.1088/0004-637x/799/2/195

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Presentation] Discovery of blackbody stars and the accuracy of photometric calibration, International Astronomical Union: 20th General Assembly2018

    • Author(s)
      M. Fukugita
    • Organizer
      Wien 2018: Focus Meeting 12 'Calibration and Standardisation Issues in UV-VIS-IR Astronomy'
    • Related Report
      2018 Annual Research Report

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Published: 2015-04-16   Modified: 2020-03-30  

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