SIGNATURE of AN INTERMEDIATE-MASS BLACK HOLE in the CENTRAL MOLECULAR ZONE of OUR GALAXY

Tomoharu Oka, Reiko Mizuno, Kodai Miura, Shunya Takekawa

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

We mapped the high-velocity compact cloud CO-0.40-0.22 in 21 molecular lines in the 3 mm band using the Nobeyama Radio Observatory 45 m radio telescope. Eighteen lines were detected from CO-0.40-0.22. The map of each detected line shows that this cloud has a compact appearance (d ≃ 3 pc) and extremely broad velocity width (ΔV ≃ 100 km s-1). The mass and kinetic energy of CO-0.40-0.22 are estimated to be 103.6 Mo and 1049.7 erg, respectively. The representative position-velocity map along the major axis shows that CO-0.40-0.22 consists of an intense region with a shallow velocity gradient and a less intense high-velocity wing. Here, we show that this kinematical structure can be attributed to a gravitational kick to the molecular cloud caused by an invisible compact object with a mass of ∼105 Mo. Its compactness and the absence of counterparts at other wavelengths suggest that this massive object is an intermediate-mass black hole.

Original languageEnglish
Article numberL7
JournalAstrophysical Journal Letters
Volume816
Issue number1
DOIs
Publication statusPublished - 2016 Jan 1

Keywords

  • Galaxy: center
  • ISM: clouds
  • ISM: molecules
  • nuclei

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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