A new view of the Spiral Structure of the Northern Outer Milky Way in Carbon Monoxide
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866915024412344320 |
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| author | Sun, Yan Yang, Ji Zhang, Shaobo Yan, Qing-Zeng Su, Yang Chen, Xuepeng Zhou, Xin Xu, Ye Wang, Hongchi Wang, Min Jiang, Zhibo Sun, Ji-Xian Lu, Deng-Rong Ju, Bing-Gang Zhang, Xu-Guo Wang, Min |
| author_facet | Sun, Yan Yang, Ji Zhang, Shaobo Yan, Qing-Zeng Su, Yang Chen, Xuepeng Zhou, Xin Xu, Ye Wang, Hongchi Wang, Min Jiang, Zhibo Sun, Ji-Xian Lu, Deng-Rong Ju, Bing-Gang Zhang, Xu-Guo Wang, Min |
| contents | Based on 32162 molecular clouds from the Milky Way Imaging Scroll Painting project, we obtain new face-on molecular gas maps of the northern outer Galaxy. The total molecular gas surface density map reveals three segments of spirals, extending 16-43 kiloparsecs in length. The Perseus and Outer arms stand out prominently, appearing as quasi-continuous structures along most of their length. At the Galactic outskirts, about 1306 clouds connect the two segments of the new spiral arm discovered by Dame & Thaddeus (2011) in the first quadrant and Sun et al. (2015) in the second quadrant, possibly extending the arm into the outer third quadrant. Logarithmic spirals can be fitted to the CO arm segments with pitch angles ranging from 4 to 12 degree. These CO arms extend beyond previous CO studies and the optical radius, reaching a galactic radius of about 22 kiloparsecs, comparable to the HI radial range. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_11220 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A new view of the Spiral Structure of the Northern Outer Milky Way in Carbon Monoxide Sun, Yan Yang, Ji Zhang, Shaobo Yan, Qing-Zeng Su, Yang Chen, Xuepeng Zhou, Xin Xu, Ye Wang, Hongchi Wang, Min Jiang, Zhibo Sun, Ji-Xian Lu, Deng-Rong Ju, Bing-Gang Zhang, Xu-Guo Wang, Min Astrophysics of Galaxies Based on 32162 molecular clouds from the Milky Way Imaging Scroll Painting project, we obtain new face-on molecular gas maps of the northern outer Galaxy. The total molecular gas surface density map reveals three segments of spirals, extending 16-43 kiloparsecs in length. The Perseus and Outer arms stand out prominently, appearing as quasi-continuous structures along most of their length. At the Galactic outskirts, about 1306 clouds connect the two segments of the new spiral arm discovered by Dame & Thaddeus (2011) in the first quadrant and Sun et al. (2015) in the second quadrant, possibly extending the arm into the outer third quadrant. Logarithmic spirals can be fitted to the CO arm segments with pitch angles ranging from 4 to 12 degree. These CO arms extend beyond previous CO studies and the optical radius, reaching a galactic radius of about 22 kiloparsecs, comparable to the HI radial range. |
| title | A new view of the Spiral Structure of the Northern Outer Milky Way in Carbon Monoxide |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2411.11220 |