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

20 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
Publication statusPublished - 2001 Oct 25
Externally publishedYes

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molecular clouds
shell
kinetic energy
supernovae
explosions
explosion
telescopes
radio
continuums
magnetic field
magnetic fields
energy

Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

A hyperenergetic CO shell in the Galactic center molecular cloud complex. / Oka, Tomoharu; Hasegawa, Tetsuo; Sato, Fumio; Tsuboi, Masato; Miyazaki, Atsushi.

In: Publications of the Astronomical Society of Japan, Vol. 53, No. 5, 25.10.2001, p. 787-791.

Research output: Contribution to journalArticle

Oka, T, Hasegawa, T, Sato, F, Tsuboi, M & Miyazaki, A 2001, 'A hyperenergetic CO shell in the Galactic center molecular cloud complex', Publications of the Astronomical Society of Japan, vol. 53, no. 5, pp. 787-791.
Oka, Tomoharu ; Hasegawa, Tetsuo ; Sato, Fumio ; Tsuboi, Masato ; Miyazaki, Atsushi. / A hyperenergetic CO shell in the Galactic center molecular cloud complex. In: Publications of the Astronomical Society of Japan. 2001 ; Vol. 53, No. 5. pp. 787-791.
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