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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Triggered high-mass star formation in the H II region W28A2: A cloud-cloud collision scenario
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Triggered high-mass star formation in the H II region W28A2: A cloud-cloud collision scenario

机译：在H II区W28A2中触发高质量星形成：云云碰撞场景

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We report on a study of the high-mass star formation in the H II region W 28 A2 by investigating the molecular clouds that extend over similar to 5-10 pc from the exciting stars using the (CO)-C-12 and (CO)-C-13 (J = 1-0) and (CO)-C-12 (J = 2-1) data taken by NANTEN2 and Mopra observations. These molecular clouds consist of three velocity components with CO intensity peaks at V-LSR similar to -4 km s(-1), 9 km s(-1), and 16 km s(-1). The highest CO intensity is detected at V-LSR similar to 9 km s(-1), where the high-mass stars with spectral types O6.5-B0.5 are embedded. We found bridging features connecting these clouds toward the directions of the exciting sources. Comparisons of the gas distributions with the radio continuum emission and 8 mu m infrared emission show spatial coincidence/anti-coincidence, suggesting physical associations between the gas and the exciting sources. The (CO)-C-12 J = 2-1 to 1-0 intensity ratio shows a high value (greater than or similar to 0.8) toward the exciting sources for the -4 km s(-1) and +9 km s(-1) clouds, possibly due to heating by the high-mass stars, whereas the intensity ratio at the CO intensity peak (V-LSR similar to 9 km s(-1)) decreases to similar to 0.6, suggesting self absorption by the dense gas in the near side of the +9 km s(-1) cloud. We found partly complementary gas distributions between the -4 km s(-1) and +9 km s(-1) clouds, and the -4 km s(-1) and +16 km s(-1) clouds. The exciting sources are located toward the overlapping region in the -4 km s(-1) and +9 km s(-1) clouds. Similar gas properties are found in the Galactic massive star clusters RCW 38 and NGC 6334, where an early stage of cloud collision to trigger the star formation is suggested. Based on these results, we discuss the possibility of the formation of high-mass stars in the W 28 A2 region being triggered by cloud-cloud collision.
机译：我们利用NANTEN2和Mopra观测获得的（CO）-C-12和（CO）-C-13（J=1-0）和（CO）-C-12（J=2-1）数据，研究了从激发恒星延伸到类似于5-10PC的分子云，从而报告了对H II区W 28 A2高质量恒星形成的研究。这些分子云由三个速度分量组成，在V-LSR处的CO强度峰值类似于-4km s（-1）、9km s（-1）和16km s（-1）。在V-LSR处探测到最高的CO强度，类似于9km s（-1），其中光谱类型为O6的高质量恒星。5-B0。5个是嵌入式的。我们发现了将这些云连接到激发源方向的桥接特征。将气体分布与射电连续辐射和8μm红外辐射进行比较，发现空间符合/反符合，表明气体与激发源之间存在物理关联。（CO）-C-12 J=2-1:1-0强度比显示-4 km s（-1）和+9 km s（-1）云的激发源有一个高值（大于或类似于0.8），这可能是由于大质量恒星的加热，而CO强度峰值（V-LSR类似于9 km s（-1））的强度比降低到类似于0.6，这表明+9 km s（-1）云近侧的稠密气体会自我吸收。我们在-4kms（-1）和+9kms（-1）云层与-4kms（-1）和+16kms（-1）云层之间发现了部分互补气体分布。激发源位于-4kms（-1）和+9kms（-1）云中的重叠区域。在银河系大质量星团RCW 38和NGC 6334中也发现了类似的气体性质，在这两个星团中，云碰撞的早期阶段触发了恒星的形成。基于这些结果，我们讨论了W28A2区域大质量恒星的形成可能是由云团碰撞触发的。

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