WISDOM Project -- XXI. Giant molecular clouds in the central region of the barred spiral galaxy NGC 613: a steep size -- linewidth relation
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914816859308032 |
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| author | Choi, Woorak Bureau, Martin Liu, Lijie Cappellari, Michele Davis, Timothy A. Gensior, Jindra Liang, Fu-Heng Lu, Anan Moon, Sanghyuk Ruffa, Ilaria Williams, Thomas G. Chung, Aeree |
| author_facet | Choi, Woorak Bureau, Martin Liu, Lijie Cappellari, Michele Davis, Timothy A. Gensior, Jindra Liang, Fu-Heng Lu, Anan Moon, Sanghyuk Ruffa, Ilaria Williams, Thomas G. Chung, Aeree |
| contents | NGC~613 is a nearby barred spiral galaxy with a nuclear ring. Exploiting high spatial resolution ($\approx20$ pc) Atacama Large Millimeter/sub-millimeter Array $^{12}$CO(1-0) observations, we study the giant molecular clouds (GMCs) in the nuclear ring and its vicinity, identifying $158$ spatially- and spectrally-resolved GMCs. The GMC sizes ($R_{\mathrm{c}}$) are comparable to those of the clouds in the Milky Way (MW) disc, but their gas masses, observed linewidths ($σ_{\mathrm{obs,los}}$) and gas mass surface densities are larger. The GMC size -- linewidth relation ($σ_{\mathrm{obs,los}}\propto R_{\mathrm{c}}^{0.77}$) is steeper than that of the clouds of the MW disc and centre, and the GMCs are on average only marginally gravitationally bound (with a mean virial parameter $\langleα_{\mathrm{obs,vir}}\rangle\approx1.7$). We discuss the possible origins of the steep size -- linewidth relation and enhanced observed linewidths of the clouds and suggest that a combination of mechanisms such as stellar feedback, gas accretion and cloud-cloud collisions, as well as the gas inflows driven by the large-scale bar, may play a role. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_19709 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | WISDOM Project -- XXI. Giant molecular clouds in the central region of the barred spiral galaxy NGC 613: a steep size -- linewidth relation Choi, Woorak Bureau, Martin Liu, Lijie Cappellari, Michele Davis, Timothy A. Gensior, Jindra Liang, Fu-Heng Lu, Anan Moon, Sanghyuk Ruffa, Ilaria Williams, Thomas G. Chung, Aeree Astrophysics of Galaxies NGC~613 is a nearby barred spiral galaxy with a nuclear ring. Exploiting high spatial resolution ($\approx20$ pc) Atacama Large Millimeter/sub-millimeter Array $^{12}$CO(1-0) observations, we study the giant molecular clouds (GMCs) in the nuclear ring and its vicinity, identifying $158$ spatially- and spectrally-resolved GMCs. The GMC sizes ($R_{\mathrm{c}}$) are comparable to those of the clouds in the Milky Way (MW) disc, but their gas masses, observed linewidths ($σ_{\mathrm{obs,los}}$) and gas mass surface densities are larger. The GMC size -- linewidth relation ($σ_{\mathrm{obs,los}}\propto R_{\mathrm{c}}^{0.77}$) is steeper than that of the clouds of the MW disc and centre, and the GMCs are on average only marginally gravitationally bound (with a mean virial parameter $\langleα_{\mathrm{obs,vir}}\rangle\approx1.7$). We discuss the possible origins of the steep size -- linewidth relation and enhanced observed linewidths of the clouds and suggest that a combination of mechanisms such as stellar feedback, gas accretion and cloud-cloud collisions, as well as the gas inflows driven by the large-scale bar, may play a role. |
| title | WISDOM Project -- XXI. Giant molecular clouds in the central region of the barred spiral galaxy NGC 613: a steep size -- linewidth relation |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2405.19709 |