A CO J = 3-2 survey of the galactic center

Tomoharu Oka, Makoto Nagai, Kazuhisa Kamegai, Kunihiko Tanaka, Nobuyuki Kuboi

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

We have surveyed the central molecular zone (CMZ) of our Galaxy in the CO J = 3-2 line with the Atacama Submillimeter-wave Telescope Experiment (ASTE). Molecular gas in the Galactic center shows a high J=3-2/J=1-0 intensity ratio (∼ 0.9), while gas in the spiral arms of the Galactic disk shows a lower ratio (∼ 0.5). The high-velocity compact cloud CO 0.02-0.02 and the hyperenergetic shell CO 1.27+0.01, as well as gas in the Sgr A region, exhibit high J=3-2/J=1-0 intensity ratios exceeding 1.5. We also found a number of small spots of high-ratio gas. Some of these high-ratio spots have large velocity widths and some seem to be associated with nonthermal threads or filaments. These could be spots of hot molecular gas shocked by unidentified supernovae, which may be abundant in the CMZ.

Original languageEnglish
Pages (from-to)15-23
Number of pages9
JournalPublications of the Astronomical Society of Japan
Volume59
Issue number1
Publication statusPublished - 2007
Externally publishedYes

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molecular gases
gases
gas
submillimeter waves
threads
high temperature gases
supernovae
filaments
telescopes
galaxies
shell
experiment

Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

A CO J = 3-2 survey of the galactic center. / Oka, Tomoharu; Nagai, Makoto; Kamegai, Kazuhisa; Tanaka, Kunihiko; Kuboi, Nobuyuki.

In: Publications of the Astronomical Society of Japan, Vol. 59, No. 1, 2007, p. 15-23.

Research output: Contribution to journalArticle

Oka, T, Nagai, M, Kamegai, K, Tanaka, K & Kuboi, N 2007, 'A CO J = 3-2 survey of the galactic center', Publications of the Astronomical Society of Japan, vol. 59, no. 1, pp. 15-23.
Oka, Tomoharu ; Nagai, Makoto ; Kamegai, Kazuhisa ; Tanaka, Kunihiko ; Kuboi, Nobuyuki. / A CO J = 3-2 survey of the galactic center. In: Publications of the Astronomical Society of Japan. 2007 ; Vol. 59, No. 1. pp. 15-23.
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