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题名: Molecular Clouds in the Extreme Outer Galaxy between l.=34 degrees.75 to 45 degrees.25
作者: Sun, Yan; Su, Yang; Zhang, Shao-Bo; Xu, Ye; Chen, Xue-Peng; Yang, Ji; Jiang, Zhi-Bo; Fang, Min
刊名: ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
出版日期: 2017
卷号: 230, 期号:2, 页码:17-
英文摘要: We present the results of an unbiased CO survey in the Galactic range of 34 degrees 75..l..45 degrees 25 and -5 degrees.25 <= b <= 5 degrees 25, and the velocity range beyond the Outer armA total of 168 molecular clouds (MCs) are identified within the Extreme Outer Galaxy(EOG) region, and 31 of these MCs are associated with 13CO. emissionHowever, none of them show significant (CO)-O-18 emission under the current detection limitThe typical size and mass of these MCs are 5pc and 3x10(3)M(circle dot), implying a lack of large and massive MCs in the EOG regionSimilar to MCs in the outer Galaxy, the velocity dispersions of EOG clouds are also correlated with their sizes; however, they are well displaced below the scaling relationship defined by the inner Galaxy MCsThese MCs with a median Galactocentric radius of 12.6 kpc show very different distributions from those of the MCs in the Outer arm published in our previous paper, while roughly following the Outer Scutum-Centaurus arm defined by Dame & ThaddeusThis result may provide robust evidence for the existence of the Outer Scutum-Centaurus armThe lower limit of the total mass of this segment is about 2.7x105Me, which is about one magnitude lower than that of the Outer armThe mean thickness of the gaseous disk is about 1 degrees 45 or 450pc, and the scale height is about 1 degrees 27, or 400pc above the b=0 degrees planeThe warp traced by CO emission is very obvious in the EOG region and its amplitude is consistent with the predictions by other warp models using different tracers, such as dust, H I, and stellar components of our Galaxy.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17370
Appears in Collections:分子云与恒星形成研究团组_期刊论文

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