...
首页> 外文期刊>The Astrophysical journal >MILLIMETRIC AND SUBMILLIMETRIC OBSERVATIONS OF IRAS?05327+3404 “HOLOEA” IN M36
【24h】

MILLIMETRIC AND SUBMILLIMETRIC OBSERVATIONS OF IRAS?05327+3404 “HOLOEA” IN M36

机译:IRAS?05327 + 3404“ HOLOEA”在M36中的军事和次军事观测

获取原文
           

摘要

The transition between the protostar, Class?I, and the pre-main-sequence star, Class?II, phases is still one of the most uncertain, and important, stages in the knowledge of the process of formation of an individual star because it is the stage that determines the final mass of the star. We observed the young stellar object "Holoea," associated with IRAS?05327+3404, which was classified as an object in the transition between the Class?I and Class?II phases with several unusual properties, and appears to be surrounded by large amounts of circumstellar material. We used the SMA and BIMA telescopes at millimeter and submillimeter (submm) wavelengths to observe the dust continuum emission and the CO (1-0) and (2-1), HCO+ (1-0) and (3-2), and HCN (1-0) transitions in the region around IRAS?05327+3404. We detected two continuum emission peaks at 1.1?mm: SMM?1, the submm counterpart of IRAS?05327+3404, and SMM?2, ~6?arcsec to the west. The emissions of the three molecules show marked differences. The CO emission near the systemic velocity is filtered out by the telescopes, and CO mostly traces the high-velocity gas. The HCO+ and HCN emissions are more concentrated around the central parts of the region, and show several intensity peaks coincident with the submm continuum peaks. We identify two main molecular outflows: a bipolar outflow in an E-W direction that would be powered by SMM?1 and the other in a NE direction, which we associate with SMM?2. We propose that the SMM?sources are probably Class?I objects, with SMM?1 in an earlier evolutionary stage.
机译:在已知单个恒星形成过程的过程中,原恒星I类和主序前恒星II类之间的过渡仍然是最不确定且最重要的阶段之一。是决定恒星最终质量的阶段。我们观察到了与IRAS?05327 + 3404相关的年轻恒星物体“ Holoea”,该物体被分类为具有一些不同性质的I类和II类相之间的过渡中的对象,并且似乎被大量包围的星际物质。我们使用SMA和BIMA望远镜在毫米和亚毫米(submm)波长处观察了粉尘连续发射以及CO(1-0)和(2-1),HCO +(1-0)和(3-2)以及在IRAS?05327 + 3404附近的区域中,HCN(1-0)转变。我们在1.1?mm处检测到两个连续的发射峰:SMM?1(IRAS?05327 + 3404的亚毫米对应物)和SMM?2(西向〜6?arcsec)。这三种分子的发射显示出明显的差异。接近系统速度的一氧化碳排放物被望远镜滤除,一氧化碳主要追踪高速气体。 HCO +和HCN的排放更多地集中在该地区的中部地区,并显示出与次毫米连续峰一致的几个强度峰。我们确定了两个主要的分子流出:一个在E-W方向上由SMM?1提供动力的双极流出,另一个在NE方向上与我们SMM?2相关联的双向流出。我们建议SMM源可能是Class I对象,而SMM 1则处于早期发展阶段。

著录项

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