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Physical conditions of molecular gas in the Galactic center

机译：银河系中心分子气体的物理条件

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摘要

We estimated the 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 (CO)-C-12 and (CO)-C-13 data previously observed with the Nobeyama Radio Observatory (NRO) 45 m telescope. The large velocity gradient (LVG) approximation was employed. The distributions of gas density, kinetic temperature, and CO column density were derived as functions of the position and the velocity for the entire coverage of the CO J = 3-2 data. We fairly determined the physical conditions for 69% of data points in the CMZ with >= 1 sigma or CO detections. The kinetic temperature was found to be roughly uniform in the CMZ, while the gas density was higher in the 120 pc star-forming ring than in the outer dust lanes. The physical conditions of high J = 3-2/J = 1-0 features are also discussed.
机译：我们使用阿塔卡马亚毫米望远镜实验（ASTE）结合J = 1-0（CO）获得的CO J = 3-2数据，估算了银河系中心分子带（CMZ）中分子气体的物理条件。 -C-12和（CO）-C-13数据以前是用Nobeyama Radio Observatory（NRO）45 m望远镜观测到的。采用大速度梯度（LVG）近似。气体密度，动力学温度和CO柱密度的分布作为CO J = 3-2数据整个覆盖范围的位置和速度的函数得出。我们用> = 1 sigma或CO检测公平地确定了CMZ中69％数据点的物理条件。发现在CMZ中，动力学温度大致均匀，而在120 pc的恒星形成环中，气体密度高于外部尘埃通道。还讨论了高J = 3-2 / J = 1-0特征的物理条件。

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