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arXiv 1602.06196astro-ph.GAastro-ph.SR
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NGC 2264-C的亚毫米阵列观测:分子流出和驱动源

Submillimeter Array Observations of NGC 2264-C: Molecular Outflows and Driving Sources

Nichol Cunningham, Stuart L. Lumsden, Claudia J. Cyganowski, Luke T. Maud, Cormac Purcell

摘要:

我们用1.3毫米亚毫米波阵列(SMA)在$\sim$ 3 $^{\prime\prime}$分辨率上对中等质量恒星形成星团NGC 2264-C的最亮部分进行了观测。毫米连续谱发射揭示了10个1.3mm连续谱峰,其中4个是新的检测。观测到的频率范围包括已知的分子喷流/外流示踪剂SiO(5-4),从而提供了对NGC 2264-C的SiO的第一次高分辨率观测。我们还探测到12个额外的物种的分子线朝向这个区域,包括CH $_3$ CN,CH $_3$ OH,SO,H $_2$ CO,DCN,HC $_3$ N,和$^{12}$ CO。SiO(5-4)发射揭示了在NGC 2264-C中存在两个准直的,高速(相对于系统速度高达30 km $^{-1}$)双极流出。此外,通过$^{12}$ CO、SO、H、$_2$ CO和CH $_3$ OH的排放追踪流出。我们发现了一个进化的核心之间的传播居住在同一个父云。这两个明确的外流是由最亮的毫米连续核驱动的,这些连续核是红外暗的,分子线弱的,并且可能是该地区最年轻的核。此外,对于RMS源AFGL 989-IRS 1,NGC 2264-C中红外明亮和最进化的源,我们没有观察到分子流出发射。一个分子线丰富的脊特征,没有明显的直接相关的连续源,位于低密度空腔的边缘,可能是由AFGL 989-IRS 1驱动的风形成的。此外,229 GHz的I类脉泽发射被检测到对这个功能。

英文摘要:

We present 1.3mm Submillimeter Array (SMA) observations at $\sim$3$^{\prime\prime}$ resolution towards the brightest section of the intermediate/massive star forming cluster NGC 2264-C. The millimetre continuum emission reveals ten 1.3mm continuum peaks, of which four are new detections. The observed frequency range includes the known molecular jet/outflow tracer SiO (5-4), thus providing the first high resolution observations of SiO towards NGC 2264-C. We also detect molecular lines of twelve additional species towards this region, including CH$_3$CN, CH$_3$OH, SO, H$_2$CO, DCN, HC$_3$N, and $^{12}$CO. The SiO (5-4) emission reveals the presence of two collimated, high velocity (up to 30kms$^{-1}$ with respect to the systemic velocity) bi-polar outflows in NGC 2264-C. In addition, the outflows are traced by emission from $^{12}$CO, SO, H$_2$CO, and CH$_3$OH. We find an evolutionary spread between cores residing in the same parent cloud. The two unambiguous outflows are driven by the brightest mm continuum cores, which are IR-dark, molecular line weak, and likely the youngest cores in the region. Furthermore, towards the RMS source AFGL 989-IRS1, the IR-bright and most evolved source in NGC 2264-C, we observe no molecular outflow emission. A molecular line rich ridge feature, with no obvious directly associated continuum source, lies on the edge of a low density cavity and may be formed from a wind driven by AFGL 989-IRS1. In addition, 229GHz class I maser emission is detected towards this feature.

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