Discovery of the Tadpole Molecular Cloud near the Galactic Nucleus

Miyuki Kaneko, Tomoharu Oka, Hiroki Yokozuka, Rei Enokiya, Shunya Takekawa, Yuhei Iwata, Shiho Tsujimoto

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


In this paper, we report the discovery of an isolated, peculiar compact cloud with a steep velocity gradient at 2.′6 northwest of Sgr A*. This “Tadpole” molecular cloud is unique owing to its characteristic head-tail structure in the position-velocity space. By tracing the CO J = 3-2 intensity peak in each velocity channel, we noticed that the kinematics of the Tadpole can be well reproduced by a Keplerian motion around a point-like object with a mass of 1 × 105 M . Changes in line intensity ratios along the orbit are consistent with the Keplerian orbit model. The spatial compactness of the Tadpole and absence of bright counterparts in other wavelengths indicate that the object could be an intermediate-mass black hole.

Original languageEnglish
Article number46
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 2023 Jan 1

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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