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High-mass star formation possibly triggered by cloud-cloud collision in the HII region RCW 34

机译：高云质量恒星的形成可能是由于云云碰撞引发的   HII区域RCW 34

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We report a possibility that the high-mass star located in the HII region RCW34 was formed by a triggering induced by a collision of molecular clouds.Molecular gas distributions of the $^{12}$CO and $^{13}$CO $J=$2-1, and$^{12}$CO $J=$3-2 lines toward RCW 34 were measured by using the NANTEN2 andASTE telescopes. We found two clouds with the velocity ranges of 0-10 kms$^{-1}$ and 10-14 km s$^{-1}$. Whereas the former cloud as massive as ~2.7 x10$^{4}$ Msun has a morphology similar to the ring-like structure observed inthe infrared wavelengths, the latter cloud with the mass of ~10$^{3}$ Msun,which has not been recognized by previous observations, distributes just likelyto cover the bubble enclosed by the other cloud. The high-mass star with thespectral types of O8.5V is located near the boundary of the two clouds. Theline intensity ratio of $^{12}$CO $J=$3-2 / $J=$2-1 yields high values (~1.5)in the neighborhood of the high-mass star, suggesting that these clouds areassociated with the massive star. We also confirmed that the obtainedposition-velocity diagram shows a similar distribution with that derived by anumerical simulation of the supersonic collision of two clouds. Using therelative velocity between the two clouds (~5 km s$^{-1}$), the collisional timescale is estimated to be $\sim$0.2 Myr with the assumption of the distance of2.5 kpc. These results suggest that the high-mass star in RCW 34 was formedrapidly within a time scale of ~0.2 Myr via a triggering of cloud-cloudcollision.
机译：我们报道了位于HII区域RCW34的高质量恒星是由分子云碰撞引起的触发形成的。$ ^ {12} $ CO和$ ^ {13} $ CO $的分子气体分布通过使用NANTEN2和ASTE望远镜测量了朝向RCW 34的J = $ 2-1和$ ^ {12} $ CO $ J = $ 3-2线。我们发现了两个云，速度范围为0-10 kms $ ^ {-1} $和10-14 km s $ ^ {-1} $。前者云的质量约为〜2.7 x10 $ ^ {4} $ Msun，其形态类似于在红外波长下观察到的环状结构，而后者云的质量约为〜10 $ ^ {3} $ Msun，后者以前的观察尚未认识到这一点，只是分布很可能覆盖了另一朵云所包围的气泡。光谱类型为O8.5V的高质量恒星位于两朵云的边界附近。 $ ^ {12} $ CO $ J = $ 3-2 / $ J = $ 2-1的线强度比在高质量恒星附近产生高值（〜1.5），表明这些云区域与大质量恒星相关。我们还证实，所获得的位置-速度图显示了与通过对两朵云的超音速碰撞的模拟模拟得出的分布相似的分布。使用两个云之间的相对速度（〜5 km s $ ^ {-1} $），假设距离为2.5 kpc，则碰撞时标估计为$ \ sim $ 0.2 Myr。这些结果表明，RCW 34中的高质量恒星是通过触发云-云碰撞在约0.2 Myr的时间范围内迅速形成的。

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