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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >New panoramic view of 12CO and 1.1mm continuum emission in the orion a giant molecular cloud. I. survey overview and possible external triggers of star formation
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New panoramic view of 12CO and 1.1mm continuum emission in the orion a giant molecular cloud. I. survey overview and possible external triggers of star formation

机译：猎户座中巨大的分子云中12CO和1.1mm连续谱发射的新全景图。 I.概览和恒星形成的可能外部诱因

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摘要

We present new, wide, and deep images in the 1.1mm continuum and the 12CO (J = 1-0) emission toward the northern part of the Orion A Giant Molecular Cloud (Orion-A GMC). The 1.1mm data were taken with the AzTEC camera mounted on the Atacama Submillimeter Telescope Experiment (ASTE) 10 m telescope in Chile, and the ~(12)CO (J = 1-0) data were with the 25 beam receiver (BEARS) on the Nobeyama Radio Observatory (NRO) 45m telescope in the On-The-Fly (OTF) mode. The presentAzTEC observations are the widest (1°7 × 2°3, corresponding to 12pc × 17 pc) and the highest-sensitivity (?9mJybeam-1) 1.1mmdust-continuum imaging of the Orion-A GMC with an effective spatial resolution of ?40". The 12CO (J = 1-0) image was taken over the northern 1°2 × 1°2 (corresponding 9 pc × 9 pc) area with a sensitivity of 0.93K in TMB, a velocity resolution of 1.0 km s-1, and an effective spatial resolution of 21". With these data, together with the MSX 8μm, Spitzer 24μm, and the 2MASS data, we have investigated the detailed structure and kinematics of molecular gas associated with the Orion-A GMC, and have found evidence for interactions between molecular clouds and the external forces that may trigger star formation. Two types of possible triggers were revealed: (1) Collisions of the diffuse gas on the cloud surface, particularly at the eastern side of the OMC-2/3 region, and (2) Irradiation of UV on the pre-existing filaments and dense molecular cloud cores. Our wide-field and high-sensitivity imaging has provided the first comprehensive view of the potential sites of triggered star formation in the Orion-A GMC.
机译：我们呈现了1.1mm连续区域和朝向Orion A巨型分子云（Orion-A GMC）北部的12CO（J = 1-0）发射的新，宽和深图像。使用安装在智利阿塔卡马亚毫米望远镜实验（ASTE）10 m望远镜上的AzTEC摄像机拍摄1.1mm数据，使用25束接收器（BEARS）拍摄〜（12）CO（J = 1-0）数据。在即时（OTF）模式下使用Nobeyama无线电天文台（NRO）45m望远镜拍摄。目前的AzTEC观测值是Orion-A GMC的最宽（1°7×2°3，对应于12pc×17 pc）和最高灵敏度（？9mJybeam-1）1.1mm尘埃连续谱成像，有效空间分辨率为？40“。12CO（J = 1-0）图像是在北1°2×1°2（对应9 pc×9 pc）区域上拍摄的，在TMB中的灵敏度为0.93K，速度分辨率为1.0 km s-1，有效空间分辨率为21“。利用这些数据，以及MSX8μm，Spitzer24μm和2MASS数据，我们研究了与Orion-A GMC相关的分子气体的详细结构和运动学，并找到了分子云与外力之间相互作用的证据。可能触发恒星形成。揭示了两种可能的触发因素：（1）云表面上的扩散气体碰撞，尤其是在OMC-2 / 3区域的东侧;（2）预先存在的细丝上的紫外线辐射和致密分子云核心。我们的宽视场和高灵敏度成像为Orion-A GMC中引发恒星形成的潜在位置提供了第一个综合视图。

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