A hyperenergetic CO shell in the Galactic center molecular cloud complex

Tomoharu Oka, Tetsuo Hasegawa, Fumio Sato, Masato Tsuboi, Atsushi Miyazaki

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We report on the detection of a high-velocity feature, CO 1.27+0.01, in the Galactic-center molecular-cloud complex. In our 12CO images taken with the NRO 45m telescope, CO 1.27+0.01 appears as the second prominent high-velocity feature, next to CO 0.02-0.02, having a velocity width of Δ V ≃ 100kms-1 and a size of 9pc × 12pc. It seems to consist of two expanding shells with sizes of ∼ 10 pc. The major shell has a kinetic energy of about an order of magnitude larger than the gravitational energy, indicating that the shell is apparently gravitationally unbound. We propose that CO 1.27+0.01 may have been accelerated by a series of supernova explosions which occurred within the last ∼ 6 × 104 yr. No association of a nonthermal radio continuum source suggests a strong magnetic field (B ≳ 0.4mG) in the vicinity of CO 1.27+0.01.

Original languageEnglish
Pages (from-to)787-791
Number of pages5
JournalPublications of the Astronomical Society of Japan
Volume53
Issue number5
DOIs
Publication statusPublished - 2001 Oct 25
Externally publishedYes

Keywords

  • Galaxies: nuclei
  • Galaxy: center
  • Ism: clouds
  • Ism: molecules

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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