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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2502.06102 |
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| _version_ | 1866909485745831936 |
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| author | Maeda, Fumiya Ohta, Kouji Egusa, Fumi Fujimoto, Yusuke Kobayashi, Masato I. N. Inoue, Shin Habe, Asao |
| author_facet | Maeda, Fumiya Ohta, Kouji Egusa, Fumi Fujimoto, Yusuke Kobayashi, Masato I. N. Inoue, Shin Habe, Asao |
| contents | While cloud-cloud collisions (CCCs) have been proposed as a mechanism for triggering massive star formation, it is suggested that higher collision velocities ($v_{\rm col}$) and lower GMC mass ($M_{\rm GMC}$) or/and density ($Σ_{\rm GMC}$) tend to suppress star formation. In this study, we choose the nearby barred galaxy NGC 3627 to examine the SFR and SFE of a colliding GMC ($m^\star_{\rm CCC}$ and $ε_{\rm CCC}$) and explore the connections between $m^\star_{\rm CCC}$ and $ε_{\rm CCC}$, $M_{\rm GMC}$($Σ_{\rm GMC}$) and $v_{\rm col}$, and galactic structures (disk, bar, and bar-end). Using ALMA CO(2--1) data (60~pc resolution), we estimated $v_{\rm col}$ within 500~pc apertures, based on line-of-sight GMC velocities, assuming random motion in a two-dimensional plane. We extracted apertures where at least 0.1 collisions occur per 1 Myr, identifying them as regions dominated by CCC-driven star formation, and then calculated $m^\star_{\rm CCC}$ and $ε_{\rm CCC}$ using attenuation-corrected H$α$ data from VLT MUSE. We found that both $m^\star_{\rm CCC}$ and $ε_{\rm CCC}$ are lower in the bar (median values: $10^{3.84}~M_\odot$ and $0.18~\%$), and higher in the bar-end ($10^{4.89}~M_\odot$ and $1.10~\%$) compared to the disk ($10^{4.28}~M_\odot$ and $0.75~\%$). Furthermore, we found that structural differences within the parameter space of $v_{\rm col}$ and $M_{\rm GMC}$($Σ_{\rm GMC}$), with higher $M_{\rm GMC}$($Σ_{\rm GMC}$) in the bar-end and higher $v_{\rm col}$ in the bar compared to the disk, lead to higher star formation activity in the bar-end and lower activity in the bar. Our results support the scenario that variations in CCC properties across different galactic structures can explain the observed differences in SFE on a kpc scale within a disk galaxy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_06102 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Galactic structure dependence of cloud-cloud collisions driven star formation in the barred galaxy NGC 3627 Maeda, Fumiya Ohta, Kouji Egusa, Fumi Fujimoto, Yusuke Kobayashi, Masato I. N. Inoue, Shin Habe, Asao Astrophysics of Galaxies While cloud-cloud collisions (CCCs) have been proposed as a mechanism for triggering massive star formation, it is suggested that higher collision velocities ($v_{\rm col}$) and lower GMC mass ($M_{\rm GMC}$) or/and density ($Σ_{\rm GMC}$) tend to suppress star formation. In this study, we choose the nearby barred galaxy NGC 3627 to examine the SFR and SFE of a colliding GMC ($m^\star_{\rm CCC}$ and $ε_{\rm CCC}$) and explore the connections between $m^\star_{\rm CCC}$ and $ε_{\rm CCC}$, $M_{\rm GMC}$($Σ_{\rm GMC}$) and $v_{\rm col}$, and galactic structures (disk, bar, and bar-end). Using ALMA CO(2--1) data (60~pc resolution), we estimated $v_{\rm col}$ within 500~pc apertures, based on line-of-sight GMC velocities, assuming random motion in a two-dimensional plane. We extracted apertures where at least 0.1 collisions occur per 1 Myr, identifying them as regions dominated by CCC-driven star formation, and then calculated $m^\star_{\rm CCC}$ and $ε_{\rm CCC}$ using attenuation-corrected H$α$ data from VLT MUSE. We found that both $m^\star_{\rm CCC}$ and $ε_{\rm CCC}$ are lower in the bar (median values: $10^{3.84}~M_\odot$ and $0.18~\%$), and higher in the bar-end ($10^{4.89}~M_\odot$ and $1.10~\%$) compared to the disk ($10^{4.28}~M_\odot$ and $0.75~\%$). Furthermore, we found that structural differences within the parameter space of $v_{\rm col}$ and $M_{\rm GMC}$($Σ_{\rm GMC}$), with higher $M_{\rm GMC}$($Σ_{\rm GMC}$) in the bar-end and higher $v_{\rm col}$ in the bar compared to the disk, lead to higher star formation activity in the bar-end and lower activity in the bar. Our results support the scenario that variations in CCC properties across different galactic structures can explain the observed differences in SFE on a kpc scale within a disk galaxy. |
| title | Galactic structure dependence of cloud-cloud collisions driven star formation in the barred galaxy NGC 3627 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2502.06102 |