论文标题
星形地点IC 446和IC 447：Monoceros R1细丝的最终主导的结果
Star-forming sites IC 446 and IC 447: an outcome of end-dominated collapse of Monoceros R1 filament
论文作者
论文摘要
我们介绍了Monoceros R1（Mon R1）复合物（在D〜760 PC）的多波长观测值的分析。在复合体中研究了一个细长的细丝（长度〜14 pc，质量〜1465 msun），这是Herschel柱密度图中最突出的结构。对Fugin 12CO（1-0）和13CO（1-0）线数据的分析证实了在[-5，+1] km/s的速度范围内追踪的细丝的存在。发现灯丝在其相对的两端容纳两个先前已知的位点IC 446和IC 447。一个庞大的年轻恒星物体（YSO）嵌入IC 446中，而IC 447包含几个巨大的B型星。 Herschel温度图揭示了延伸的温暖灰尘发射（在T_D〜15-21 K时）朝向灯丝的两端。 4.5微米/3.6微米发射的Spitzer比率图表明存在光解离区域以及对IC 446和IC 447的流出活动的特征。基于对点样源的光度分析，YSOS的簇主要追溯到靠近灯丝的末端。发现细丝是热临界的，显示出其碎裂的趋势，这是通过在13CO的速度曲线中检测到周期性振荡模式（周期为〜3-4 pc）的进一步证实。我们的结果表明，分布在细丝末端的碎片已经迅速崩溃，并形成了已知的星形位点。总体而言，如Pon等人所讨论的那样，MON R1中的细长是“最终主导的崩溃”情景的有希望的样本。 （2011，2012）。
We present an analysis of multi-wavelength observations of Monoceros R1 (Mon R1) complex (at d ~760 pc). An elongated filament (length ~14 pc, mass ~1465 Msun) is investigated in the complex, which is the most prominent structure in the Herschel column density map. An analysis of the FUGIN 12CO(1-0) and 13CO(1-0) line data confirms the existence of the filament traced in a velocity range of [-5, +1] km/s. The filament is found to host two previously known sites IC 446 and IC 447 at its opposite ends. A massive young stellar object (YSO) is embedded in IC 446, while IC 447 contains several massive B-type stars. The Herschel temperature map reveals the extended warm dust emission (at T_d ~ 15-21 K) toward both the ends of the filament. The Spitzer ratio map of 4.5 micron/3.6 micron emission suggests the presence of photo-dissociation regions and signature of outflow activity toward IC 446 and IC 447. Based on the photometric analysis of point-like sources, clusters of YSOs are traced mainly toward the filament ends. The filament is found to be thermally supercritical showing its tendency of fragmentation, which is further confirmed by the detection of a periodic oscillatory pattern (having a period of ~3-4 pc) in the velocity profile of 13CO. Our outcomes suggest that the fragments distributed toward the filament ends have rapidly collapsed, and had formed the known star-forming sites. Overall, the elongated filament in Mon R1 is a promising sample of the "end-dominated collapse" scenario, as discussed by Pon et al. (2011, 2012).
