Large-Field CO (J = 1→0) Observations of the Starburst Galaxy M 82
Large-Field CO (J = 1→0) Observations of the Starburst Galaxy M 82
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DOI：
10.1093/pasj/65.3.66
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发表时间：
2013-06
影响因子：
2.3
通讯作者：
D. Salak;N. Nakai;Y. Miyamoto;Aya Yamauchi;T. Tsuru
中科院分区：
文献类型：
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作者：
D. Salak;N. Nakai;Y. Miyamoto;Aya Yamauchi;T. Tsuru
我们提出了大场（15.7 - 16.9弧分）CO（J = 1！0)用NRO 45米望远镜以2200的角分辨率观测星暴星系M 82。在银盘，外流（由银河风驱动）高达2千秒差距以上的银盘在晕，并在潮汐流中检测到CO排放。外流（包括CO线分裂）的运动学表明，它具有向外发散的圆柱体形状。分子气体流出的质量和动能估计为（0.26-1.0）10 Mˇ和（1-4）10 erg。在银道面上方3.5 kpc处发现了一团CO气体，它与以前在X射线观测中发现的暗带和H I发射的峰值相吻合。与H I、热分子氢和尘埃的比较表明，分子气体分别在流出流和潮汐流中显示出温暖和凉爽成分的特征。
We present large-field (15.7 16.9 arcmin) CO (J = 1!0) observations of the starburst galaxy M 82, at an angular resolution of 2200 with the NRO 45-m telescope. The CO emission was detected in the galactic disk, outflow (driven by the galactic wind) up to 2 kpc above the galactic plane in the halo, and in tidal streams. The kinematics of the outflow (including CO line splitting) suggests that it has the shape of a cylinder that is diverging outwards. The mass and kinetic energy of the molecular gas outflow are estimated to be (0.26–1.0) 10 Mˇ and (1–4) 10 erg. A clump of CO gas was discovered 3.5 kpc above the galactic plane; it coincides with a dark lane previously found in X-ray observations, and a peak in H I emission. A comparison with H I, hot molecular hydrogen and dust suggests that the molecular gas shows signatures of warm and cool components in the outflow and tidal streams, respectively.