• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >CO observations toward the isolated mid-infrared bubble S44: External triggering of O-star formation by a cloud-cloud collision
【24h】

CO observations toward the isolated mid-infrared bubble S44: External triggering of O-star formation by a cloud-cloud collision

机译：朝向孤立的中红外泡沫S44的共同观察：云云碰撞对O星形成的外部触发

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We have performed a multi-wavelength study of the mid-infrared bubble S44 to investigate the origin of isolated high-mass star(s) and the star-formation process around the bubble formed by the H II region. We report on the results of new CO observations ((CO)-C-12, (CO)-C-13 J = 1-0, and (CO)-C-12 J = 3-2) toward the isolated bubble S44 using the NANTEN2, Mopra, and ASTE radio telescopes. We found two velocity components at -84 km s(-1) and -79 km s(-1) in the direction of the bubble. These two clouds are likely to be physically associated with the bubble, because of the enhanced (CO)-C-12 J = 3-2/1-0 intensity ratio from a ring-like structure affected by ultraviolet radiation from embedded high-mass star(s) and of the morphological correspondence between the 8 mu m emission and the CO distribution. Assuming a single object, we estimate a spectral type of the embedded star inside the bubble to be O8.5-9 (similar to 20 M-circle dot) from the radio-continuum free-free emission. We hypothesize that the two clouds collided with each other 3 Myr ago, triggering the formation of the isolated high-mass star in S44, as also occurred in RCW120 and RCW79. We argue that this scenario can explain the origin of the isolated O-star inside the bubble.
机译：我们对中红外气泡S44进行了多波长研究，以研究孤立的高质量恒星的起源以及H II区域形成的气泡周围的恒星形成过程。我们报告了使用NANTEN2、Mopra和ASTE射电望远镜对孤立气泡S44进行的新CO观测（（CO）-C-12、（CO）-C-13 J=1-0和（CO）-C-12 J=3-2）的结果。我们在气泡方向的-84千米秒（-1）和-79千米秒（-1）处发现了两个速度分量。这两个云很可能在物理上与气泡有关，因为受嵌入的高质量恒星紫外线辐射影响的环形结构的（CO）-C-12 J=3-2/1-0强度比增强，以及8μm发射和CO分布之间的形态对应关系。假设只有一个物体，我们估计气泡中嵌入恒星的光谱类型为O8。5-9（类似于20米圆点）从无线电连续无发射。我们假设这两个云团在3年前相互碰撞，触发了S44中孤立的高质量恒星的形成，RCW120和RCW79中也发生了这种情况。我们认为，这种情况可以解释气泡内孤立的O星的起源。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号