银河系反中心两个速度异常的分子云

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Journal of the Korean Astronomical Society Pub Date : 2014-12-31 DOI:10.5303/JKAS.2014.47.6.319
Youngung Lee, Young Sik Kim, Hyung-Goo Kim, J. Jung, I. Yim, Hyun-Sil Kang, Changhoon Lee, Bong-Gyu Kim, Kwang-Tae Kim
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引用次数: 0

摘要

我们利用台德射电天文台14米射电望远镜上的3毫米SIS混频器接收器,绘制了位于12 CO和13 CO (J = 1-0)跃迁的精确反中心区域的两个分子云。在该方向上,具有V LSR ~ -20 km s -1异常速度的目标云与其他云有所区别。此外,它们位于猎户座臂和英仙座臂之间的臂间区域。云的大小估计分别为8.6%和10.8%。根据云的CO光度估计其总质量约为4 × 10³M⊙。探测到几个核心,但根据IRAS点源没有发现恒星形成的迹象。它们更大的线宽,异常的速度,以及它们在臂间区的位置使这些云更加明显,尽管它们的物理性质在质量和大小方面与太阳附近的黑云相似。
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TWO MOLECULAR CLOUDS WITH ANOMALOUS VELOCITIES IN THE GALACTIC ANTICENTER
We map two molecular clouds located in the exact anticenter region emitting in the (J = 1-0) transition of 12 CO and 13 CO using the 3-mm SIS mixer receiver on the 14-m radio telescope at Taeduk Radio Astronomy Observatory. The target clouds with anomalous velocities of V LSR ~ -20 km s -1 are distinguished from other clouds in this direction. In addition, they are located in the interarm region between the Orion Arm and the Perseus Arm. Sizes of the clouds are estimated to be about 8.6 and 10.8 pc, respectively. The total mass is estimated to be about 4 x 10³ M ⊙ using CO luminosity of the clouds. Several cores are detected, but no sign of star formation is found according to the IRAS point sources. Their larger linewidths, anomalous velocities, and their location at the interarm region make these clouds more distinguished, though their physical properties are similar to the dark clouds in the solar neighborhood in terms of mass and size.
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来源期刊
Journal of the Korean Astronomical Society
Journal of the Korean Astronomical Society 地学天文-天文与天体物理
CiteScore
1.30
自引率
10.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.
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