Physical conditions of molecular gas in the galactic center
Physical conditions of molecular gas in the galactic center
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DOI：
10.1093/pasj/59.1.25
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发表时间：
2007-01
影响因子：
2.3
通讯作者：
M. Nagai;Kunihiko Tanaka;K. Kamegai;T. Oka
中科院分区：
文献类型：
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作者：
M. Nagai;Kunihiko Tanaka;K. Kamegai;T. Oka
利用阿塔卡马亚毫米望远镜实验（ASTE）获得的CO J=3-2数据，结合NRO 45 m望远镜先前观测到的J=1-0 12 CO和13 CO数据，我们估算了银河系中央分子带（CMZ）分子气体的物理条件。采用大速度梯度（LVG）近似。气体密度，动力学温度和CO柱密度的分布推导出作为位置和速度的函数的CO J=3-2数据的整个覆盖范围。我们公平地确定了CMZ中69%的数据点的物理条件，其中CO检测>= 1 sigma。动力学温度被认为是大致均匀的CMZ，而气体密度是120 pc的星星形成环比在外部尘埃带。讨论了高J=3-2/J=1-0特征的物理条件。
We estimated physical conditions of molecular gas in the central molecular zone (CMZ) of the Galaxy, using our CO J=3-2 data obtained with the Atacama Submillimeter Telescope Experiment (ASTE) in conjunction with J=1-0 12CO and 13CO data previously observed with the NRO 45m telescope. The large velocity gradient (LVG) approximation was employed. Distributions of gas density, kinetic temperature, and CO column density are derived as functions of position and velocity for the entire coverage of the CO J=3-2 data. We fairly determined physical conditions for 69 % of data points in the CMZ with >= 1 sigma CO detections. Kinetic temperature was found to be roughly uniform in the CMZ, while gas density is higher in the 120-pc star forming ring than in the outer dust lanes. Physical conditions of high J=3-2/J=1-0 features are also discussed.