Discovery of Two Small High-velocity Compact Clouds in the Central 10 pc of Our Galaxy

Shunya Takekawa, Tomoharu Oka, Yuhei Iwata, Sekito Tokuyama, Mariko Nomura

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We discovered two small high-velocity compact clouds (HVCCs) in the HCN J = 4-3 and J = 3-2 maps of the central 20 pc of our Galaxy. Both HVCCs have broad velocity widths (ΔV ≳ 40 km s-1) and compact sizes (d ∼1 Pc), and originate from the dense molecular clouds in the position-velocity space. One of them has a faint counterpart in a Paschen-α image. Their spatial structure, kinematics, and absence of luminous stellar object are compatible with the notion that each of the small HVCCs is driven by the plunge of an invisible compact object into a molecular cloud. Such objects are most likely inactive, isolated black holes.

Original languageEnglish
Article numberL11
JournalAstrophysical Journal Letters
Volume843
Issue number1
DOIs
Publication statusPublished - 2017 Jul 1

Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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