论文标题

盖亚(Gaia)和赫歇尔(Herschel)对金牛座星形区域的3D视图:与丝状分子云有关

A 3D view of the Taurus star-forming region by Gaia and Herschel: multiple populations related to the filamentary molecular cloud

论文作者

Roccatagliata, V., Franciosini, E., Sacco, G. G., Randich, S., Sicilia-Aguilar, A.

论文摘要

语境。金牛座代表研究年轻恒星种群的三维分布并将其与相关的分子云相关联的理想区域。目标。第二个GAIA数据发布(DR2)使我们能够从先前定义的强大成员身份开始研究金牛座复合体。可以使用Herschel的公共远红外地图在发射中构成的分子云。方法。从光谱确认的成员的编译目录中,我们在Gaia DR2存档中以可靠的视差和适当的动作分析了283个来源。我们符合多元高斯人所描述的多个种群的视差和适当运动的分布。我们计算笛卡尔银河坐标(X,Y,Z),对于与主云相关的种群,也是银河系空间速度(U,V,W)。我们讨论了种群与赫歇尔所追踪的丝状分子云的结构有关的空间分布。结果。我们发现了六个种群的存在,这些人群都在视差和适当的动作中定义得很好,唯一的例外是TaurusD。派生距离范围在130至160 pc之间。我们没有发现恒星种群与相关的分子云之间的独特关系:尽管恒星种群似乎位于云表面,两者都位于相似的距离上,但在分子云中以细丝结构时并非如此。金牛座B可能朝金牛座A的方向移动,而金牛座E似乎正在向他们移动。结论。金牛座区域是复杂的恒星形成历史的结果,该历史很可能发生在独立发展的块状和丝状结构中。

Context. Taurus represents an ideal region to study the three-dimensional distribution of the young stellar population and relate it to the associated molecular cloud. Aims. The second Gaia data release (DR2) enables us to investigate the Taurus complex in three dimensions, starting from a previously defined robust membership. The molecular cloud structured in filaments can be traced in emission using the public far-infrared maps from Herschel. Methods. From a compiled catalog of spectroscopically confirmed members, we analyze the 283 sources with reliable parallax and proper motions in the Gaia DR2 archive. We fit the distribution of parallaxes and proper motions with multiple populations described by multivariate Gaussians. We compute the cartesian Galactic coordinates (X,Y,Z) and, for the populations associated with the main cloud, also the galactic space velocity (U,V,W). We discuss the spatial distribution of the populations in relation to the structure of the filamentary molecular cloud traced by Herschel. Results. We discover the presence of six populations which are all well defined in parallax and proper motions, with the only exception being Taurus D. The derived distances range between 130 and 160 pc. We do not find a unique relation between stellar population and the associated molecular cloud: while the stellar population seems to be on the cloud surface, both lying at similar distances, this is not the case when the molecular cloud is structured in filaments. Taurus B is probably moving in the direction of Taurus A, while Taurus E appears to be moving towards them. Conclusions. The Taurus region is the result of a complex star formation history which most probably occurred in clumpy and filamentary structures that are evolving independently.

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