Wide-field SCUBA-2 observations of NGC 2264: submillimetre clumps and filaments
Wide-field SCUBA-2 observations of NGC 2264: submillimetre clumps and filaments
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DOI：
10.1093/mnras/stv1761
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发表时间：
2015-10
影响因子：
4.8
通讯作者：
J. Buckle;J. Richer
中科院分区：
文献类型：
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作者：
J. Buckle;J. Richer
我们使用James Clerk Maxwell望远镜上的Scuba-2对尘埃连续体中的NGC2264分子云进行了850和450μm的宽视场观测。利用12CO3→2分子谱线数据，我们确定在与高速分子外流相关的局域区，CO的排放在30%的水平上污染了850亿μm的排放。在大质量恒星S附近的震荡区域，污染水平要高得多，达到60%。如果不去除，一氧化碳污染水平将使NGC-2264中的粉尘质量增加13%。我们使用FellWalker例程将尘埃分解为块状结构，并使用基于黑森的例程将尘埃分解为丝状结构。这些细丝可以描述为一种轮毂-细丝结构，较低的柱密度细丝从NGC-2264的原簇中心辐射出来。在平均丝柱密度2.4×10 2 2 cm−2以上，恒星的形成是由两颗或更多的原星形成的。在这些柱状密度以下，细丝是无星的，或者只含有一颗原星。
We present wide-field observations of the NGC 2264 molecular cloud in the dust continuum at 850 and 450 μm using SCUBA-2 on the James Clerk Maxwell Telescope. Using12CO 3 → 2 molecular line data, we determine that emission from CO contaminates the 850 μm emission at levels ∼30 per cent in localized regions associated with high-velocity molecular outflows. Much higher contamination levels of 60 per cent are seen in shocked regions near the massive star S Mon. If not removed, the levels of CO contamination would contribute an extra 13 per cent to the dust mass in NGC 2264. We use thefellwalkerroutine to decompose the dust into clumpy structures, and a Hessian-based routine to decompose the dust into filamentary structures. The filaments can be described as a hub-filament structure, with lower column density filaments radiating from the NGC 2264 C protocluster hub. Above mean filament column densities of 2.4 × 1022cm−2, star formation proceeds with the formation of two or more protostars. Below these column densities, filaments are starless, or contain only a single protostar.