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首页> 外文期刊>Astronomy and astrophysics >Discovery of a dense molecular cloud towards a young massive embedded star in 30?Doradus
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Discovery of a dense molecular cloud towards a young massive embedded star in 30?Doradus

机译：在30年代发现了一颗朝向年轻的大质量嵌入式恒星的致密分子云？

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Context. The 30Doradus region in the Large Magellanic Cloud is one of the most outstanding star-forming regions of the Local Group and a primary target for studying star formation in an environment of low metallicity. Aims. To obtain a more complete picture of the cool gas that has not yet been consumed or dispersed, we searched for line emission from molecular clouds that could be associated with molecular hydrogen emission detected in the region. Methods. We obtained a high sensitivity 12CO J=2-1 map with the 15-m SEST telescope, complemented by pointed observations of 13CO J = 2-1 and CS J=2-1. Results. We report the discovery of a dense molecular cloud towards an embedded young massive star at 20(5pc, at the distance of 50kpc) northwest of R136, the compact massive central stellar cluster powering 30Doradus in the LMC, which could be triggering star formation in the surrounding molecular clouds. We derived a molecular mass of 104,a linear radius of 3pc, as an upper limit, and a mean density of 103cm-3 for the cloud. The detection of the CS J=2-1 emission line indicates higher densities, 106cm-3. The dense molecular cloud is associated with molecular 2.12m H2 emission. We suggest that the observed molecular gas could be the remains of dense molecular material surviving the action of strong UV fields and winds in which the young massive star has formed. Key words: Magellanic Clouds - HIIregions - ISM: individual objects: 30Doradus - ISM: molecules
机译：上下文。大麦哲伦星云中的30Doradus地区是本地群中最杰出的恒星形成地区之一，也是研究低金属度环境中恒星形成的主要目标。目的为了获得尚未消耗或分散的冷气的更完整图片，我们搜索了分子云中可能与该区域中检测到的氢分子排放相关的线发射。方法。我们使用15米SEST望远镜获得了高灵敏度的12CO J = 2-1映射，并辅之以13CO J = 2-1和CS J = 2-1的尖锐观测。结果。我们报告发现在R136西北20（5pc，距离50kpc）处有一颗嵌入的年轻大质量恒星的致密分子云，这是LMC中为30Doradus提供动力的紧凑型恒星中央星团，这可能会触发恒星形成。周围的分子云。我们得出的分子量上限为104，线性半径为3pc，云的平均密度为103cm-3。 CS J = 2-1发射线的检测表明密度更高，为106cm-3。密集的分子云与分子2.12m H2的排放有关。我们建议，观察到的分子气体可能是在强烈的紫外线场和形成年轻大质量恒星的风的作用下幸存下来的致密分子材料的残留。关键词：麦哲伦星云-HII地区-ISM：单个物体：30Doradus-ISM：分子

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