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Disentangling the Molecular Gas Properties of the Nuclear Disk/Torus in Powerful Radio Galaxies with ALMA

Research Project

Project/Area Number 17K14254
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Astronomy
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

Espada Daniel  国立天文台, アルマプロジェクト, 特任准教授 (20784086)

Research Collaborator Miura Rie E.  
Project Period (FY) 2017-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsISM: clouds / galaxies: ISM / galaxies: nuclei / galaxies: elliptical / ISM: molecules / galaxies / AGN / GMCs / 電波天文学
Outline of Final Research Achievements

We present in this project ALMA observations toward the dust lane and circumnuclear disk (CND, at radii <200 pc) of the nearest elliptical and radio galaxy, NGC 5128 (Centaurus A), with high angular resolutions of ~1" (or 18 pc) or better. In this project we study: 1) the properties of the CND and mechanisms driving molecular gas to the center of the galaxy down to pc scale, 2) The physical and chemical properties of the molecular gas in this giant elliptical galaxy, 3) the relation between molecular gas and star formation rate, including the CND, and 4) the properties of Giant Molecular Clouds as a function of galacto-centric radii and environments. We find that non-circular motions and subsequent shocks play a major role to drive gas to the center. The molecular clouds and SF activities in the circumnuclear gas have different properties than those in disk galaxies, with higher velocity dispersions, lower SFEs, and a larger X factor than average values in disk galaxies.

Academic Significance and Societal Importance of the Research Achievements

This is basic research important to understand how supermassive black holes are fed and affect their environment, which is essential to understand galaxy evolution.
The research achievements were disseminated to the astronomical community through refereed publications as well as in conferences.

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • Research Products

    (10 results)

All 2019 2018 2017

All Journal Article (4 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 4 results) Presentation (6 results)

  • [Journal Article] ALMA Observations of the Molecular Gas in the Elliptical Galaxy NGC 35572019

    • Author(s)
      Vila-Vilaro Baltasar、Espada Daniel、Cortes Paulo、Leon Stephane、Pompei Emanuela、Cepa Jordi
    • Journal Title

      The Astrophysical Journal

      Volume: 870 Issue: 1 Pages: 39-39

    • DOI

      10.3847/1538-4357/aaef7f

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] THE MOLECULAR DISK OF THE ELLIPTICAL GALAXY NGC 5128 (CENTAURUS A): I. STAR FORMATION LAW AT GIANT MOLECULAR CLOUD SCALES2019

    • Author(s)
      Espada D.、Verley, S. , Miura R. E., Israel F. P.、Henkel C.、Matsushita S.、B. Vila-Vilaro, Neumayer N.、Iono D.、Aalto S.、Ott J.、Peck A. B.、Quillen A. C.、Kohno K.
    • Journal Title

      The Astrophysical Journal

      Volume: in press

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Disentangling the Circumnuclear Environs of Centaurus A. III. An Inner Molecular Ring, Nuclear Shocks, and the CO to Warm H2 Interface2017

    • Author(s)
      Espada D.、Matsushita S.、Miura R. E.、Israel F. P.、Neumayer N.、Martin S.、Henkel C.、Izumi T.、Iono D.、Aalto S.、Ott J.、Peck A. B.、Quillen A. C.、Kohno K.
    • Journal Title

      The Astrophysical Journal

      Volume: 843 Issue: 2 Pages: 136-136

    • DOI

      10.3847/1538-4357/aa78a9

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] ALMA Observations of the Physical and Chemical Conditions in Centaurus A2017

    • Author(s)
      McCoy Mark、Ott Juergen、Meier David S.、Muller Sebastien、Espada Daniel、Martin Sergio、Israel Frank P.、Henkel Christian、Impellizzeri Violette、Aalto Susanne、Edwards Philip G.、Brunthaler Andreas、Neumayer Nadine、Peck Alison B.、van der Werf Paul、Feain Ilana
    • Journal Title

      The Astrophysical Journal

      Volume: 851 Issue: 2 Pages: 76-76

    • DOI

      10.3847/1538-4357/aa99d6

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Circumnuclear Environs and Star Formation Laws at GMC scales of the Elliptical Galaxy NGC 5128 (Centaurus A)2018

    • Author(s)
      D. Espada
    • Organizer
      ALMA EA Science Workshop
    • Related Report
      2018 Annual Research Report
  • [Presentation] Star Formation Laws at GMC Scales along the Dust Lane of the Elliptical Galaxy NGC 5128 (Centaurus A)2018

    • Author(s)
      D. Espada
    • Organizer
      2018 Autumn Annual Meeting ASJ meeting at Hyogo-Himeji University
    • Related Report
      2018 Annual Research Report
  • [Presentation] ALMA observations of the circumnuclear disk of Centaurus A2017

    • Author(s)
      D. Espada
    • Organizer
      Role of Gas in Galaxy Dynamics Conference in Malta
    • Related Report
      2017 Research-status Report
  • [Presentation] Pc-scale ALMA observations of the circumnuclear molecular disk of Centaurus A2017

    • Author(s)
      D. Espada
    • Organizer
      2017 Autumn Annual Meeting ASJ meeting at Hokkaido University
    • Related Report
      2017 Research-status Report
  • [Presentation] Disentangling the Properties of the Circumnuclear Disk of Centaurus A with ALMA2017

    • Author(s)
      D. Espada
    • Organizer
      East Asia AGN workshop 2017 in Kagoshima
    • Related Report
      2017 Research-status Report
  • [Presentation] A GMC catalog for the Circumnuclear Disk of Centaurus A2017

    • Author(s)
      R. Miura, D. Espada, et al.
    • Organizer
      East Asia AGN workshop 2017 in Kagoshima
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2020-03-30  

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