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题名: ALMA Maps of Dust and Warm Dense Gas Emission in the Starburst Galaxy IC 5179
作者: Zhao, Yinghe; Lu, Nanyao; Diaz-Santos, Tanio; Xu, C. Kevin; Gao, Yu; Charmandaris, Vassilis; van der Werf, Paul; Zhang, Zhi-Yu; Cao, Chen
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2017
卷号: 845, 期号:1, 页码:58-
英文摘要: We present our high-resolution (0."15 x 0."13, similar to 34pc) observations of the CO (6-5) line emission, which probes the warm and dense molecular gas, and the 434 mu m dust continuum emission in the nuclear region of the starburst galaxy IC 5179, conducted with the Atacama Large Millimeter Array (ALMA). The CO. (6-5) emission is spatially distributed in filamentary structures with many dense cores and shows a velocity field that is characteristic of a circumnuclear rotating gas disk, with 90% of the rotation speed arising within a radius of less than or similar to 150 pc. At the scale of our spatial resolution, the CO. (6-5) and dust emission peaks do not always coincide, with their surface brightness ratio varying by a factor of similar to 10. This result suggests that their excitation mechanisms are likely different, as further evidenced by the southwest to northeast spatial gradient of both CO-to-dust continuum ratio and Pa-alpha equivalent width. Within the nuclear region (radius similar to 300 pc) and with a resolution of similar to 34 pc, the CO line flux (dust flux density) detected in our ALMA observations is 180 +/- 18 Jy km s(-1) (71 +/- 7 mJy), which accounts for 22% (2.4%) of the total value measured by Herschel.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17405
Appears in Collections:星系中的恒星形成研究团组_期刊论文

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