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

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

Research output: Contribution to journalReview articlepeer-review

37 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number14
JournalAstrophysical Journal, Supplement Series
Volume201
Issue number2
DOIs
Publication statusPublished - 2012 Aug

Keywords

  • Galaxy: center
  • ISM: clouds
  • galaxies: nuclei

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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