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

Tomoharu Oka; Makoto Nagai; Kazuhisa Kamegai; Kunihiko Tanaka

doi:10.1088/1742-6596/54/1/012

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

Tomoharu Oka, Makoto Nagai, Kazuhisa Kamegai, Kunihiko Tanaka

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

We have surveyed the central molecular zone (CMZ) of our Galaxy in the CO J3-2 line with the Atacama Submillimeter-wave Telescope Experiment (ASTE). Molecular gas in the Galactic center shows high J3-2/J1-0 intensity ratio (∼ 0.9) while gas in the Galactic disk shows the 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 J3-2/J1-0 intensity ratio 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 associate 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 language	English
Article number	012
Pages (from-to)	67-71
Number of pages	5
Journal	Journal of Physics: Conference Series
Volume	54
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/54/1/012
Publication status	Published - 2006 Dec 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1088/1742-6596/54/1/012

Cite this

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title = "A large-scale CO J=3-2 survey of the galactic center",

abstract = "We have surveyed the central molecular zone (CMZ) of our Galaxy in the CO J3-2 line with the Atacama Submillimeter-wave Telescope Experiment (ASTE). Molecular gas in the Galactic center shows high J3-2/J1-0 intensity ratio (∼ 0.9) while gas in the Galactic disk shows the 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 J3-2/J1-0 intensity ratio 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 associate with nonthermal threads or filaments. These could be spots of hot molecular gas shocked by unidentified supernovae which may be abundant in the CMZ.",

author = "Tomoharu Oka and Makoto Nagai and Kazuhisa Kamegai and Kunihiko Tanaka",

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T1 - A large-scale CO J=3-2 survey of the galactic center

AU - Oka, Tomoharu

AU - Nagai, Makoto

AU - Kamegai, Kazuhisa

AU - Tanaka, Kunihiko

PY - 2006/12/1

Y1 - 2006/12/1

N2 - We have surveyed the central molecular zone (CMZ) of our Galaxy in the CO J3-2 line with the Atacama Submillimeter-wave Telescope Experiment (ASTE). Molecular gas in the Galactic center shows high J3-2/J1-0 intensity ratio (∼ 0.9) while gas in the Galactic disk shows the 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 J3-2/J1-0 intensity ratio 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 associate with nonthermal threads or filaments. These could be spots of hot molecular gas shocked by unidentified supernovae which may be abundant in the CMZ.

AB - We have surveyed the central molecular zone (CMZ) of our Galaxy in the CO J3-2 line with the Atacama Submillimeter-wave Telescope Experiment (ASTE). Molecular gas in the Galactic center shows high J3-2/J1-0 intensity ratio (∼ 0.9) while gas in the Galactic disk shows the 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 J3-2/J1-0 intensity ratio 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 associate with nonthermal threads or filaments. These could be spots of hot molecular gas shocked by unidentified supernovae which may be abundant in the CMZ.

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

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