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

Tomoharu Oka, Yui Onodera, Makoto Nagai, Kunihiko Tanaka, Shinji Matsumura, Kazuhisa Kamegai

研究成果: Review article査読

51 被引用数 (Scopus)


We present high-resolution CO J = 3-2 maps of the Galactic center region, taken with the ASTE 10m telescope. We have collected approximately 30,000 spectra with a 34″ grid spacing. The mapping area is roughly -1°.8 < l < +35 and -08 < b < +0°.9, which includes the central molecular zone and Bania's Clump 2, covering almost the full extent of the molecular gas concentration in the Galactic center. These CO J = 3-2 images show a behavior similar to the CO J = 1-0 images with the same resolution. Molecular gas in the Galactic center shows a higher J = 3-2/J = 1-0 intensity ratio (0.7) than the gas in the spiral arms in the Galactic disk (∼0.4). The CO J = 3-2/CO J = 1-0 luminosity ratio is 0.71. We see several regions with very high J = 3-2/J = 1-0 intensity ratios exceeding 1.5, including the Sgr A, l = +13, l = -04, and l = -1°.2 regions. A number of small spots of high ratio gas are also found. Many of them have large velocity widths, indicating that they are spots of hot molecular gas shocked by unidentified supernovae and/or winds from massive stars.

ジャーナルAstrophysical Journal, Supplement Series
出版ステータスPublished - 2012 8月

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学


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