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: Article

28 引用 (Scopus)

抄録

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.

元の言語English
記事番号14
ジャーナルAstrophysical Journal, Supplement Series
201
発行部数2
DOI
出版物ステータスPublished - 2012 8

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molecular gases
gas
high temperature gases
clumps
massive stars
gases
supernovae
coverings
grids
luminosity
spacing
telescopes
high resolution

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

これを引用

ASTE CO J = 3-2 survey of the galactic center. / Oka, Tomoharu; Onodera, Yui; Nagai, Makoto; Tanaka, Kunihiko; Matsumura, Shinji; Kamegai, Kazuhisa.

:: Astrophysical Journal, Supplement Series, 巻 201, 番号 2, 14, 08.2012.

研究成果: Article

Oka, Tomoharu ; Onodera, Yui ; Nagai, Makoto ; Tanaka, Kunihiko ; Matsumura, Shinji ; Kamegai, Kazuhisa. / ASTE CO J = 3-2 survey of the galactic center. :: Astrophysical Journal, Supplement Series. 2012 ; 巻 201, 番号 2.
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AU - Onodera, Yui

AU - Nagai, Makoto

AU - Tanaka, Kunihiko

AU - Matsumura, Shinji

AU - Kamegai, Kazuhisa

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AB - 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.

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KW - Galaxy: center

KW - ISM: clouds

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