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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2510.17996 |
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| _version_ | 1866914104977915904 |
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| author | Luo, Yifei Wick, Joseph Leauthaud, Alexie Wetzel, Andrew Jones, Tucker Kado-Fong, Erin Huang, Song Chen, Xinjun Zhou, Conghao Li, Jiaxuan |
| author_facet | Luo, Yifei Wick, Joseph Leauthaud, Alexie Wetzel, Andrew Jones, Tucker Kado-Fong, Erin Huang, Song Chen, Xinjun Zhou, Conghao Li, Jiaxuan |
| contents | Hydrodynamic simulations have proposed that stellar feedback and bursty star-formation can produce dark matter cores in low-mass galaxies. A key prediction is that feedback-driven gas outflow and inflow cycles can lead to ``breathing modes'' (rapid fluctuations in the global gravitational potential) which drive correlated variations in galaxy size, kinematics, and star-formation rate. In this paper, we test the dynamical effects of feedback-driven breathing modes using a sample of 103 star-forming low-mass galaxies with stellar masses between $7.9<\rm \log M_*/M_\odot<9.6$ and $0.02<z<0.19$. We measure ionized gas velocity dispersions from H$α$ emission lines and compare them to mock observations from the FIRE-2 simulations. We compare gas velocity dispersions ($\rm σ_{gas}$), stellar masses, and specific star-formation rates (sSFR). We find a positive correlation between gas velocity dispersion residuals at fixed stellar masses ($\rm Δσ_{gas}$) and sSFR in both data and simulations. However, the relation is tighter in FIRE-2 compared to the data. FIRE-2 produces more low-sSFR galaxies compared to our observational sample, however, the sSFR distributions agree after limiting both samples to a minimum sSFR. A deeper and more complete photometric sample further indicates that observed low-mass galaxies could span the full range of sSFR predicted in the FIRE-2 simulations. Our results support the existence of short-timescale dynamical effects driven by gas outflow and inflow cycles in low-mass galaxies and motivate additional tests of the breathing mode. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_17996 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Testing the Stellar Feedback-driven Breathing Mode in Low-mass Galaxies with Gas Kinematics Luo, Yifei Wick, Joseph Leauthaud, Alexie Wetzel, Andrew Jones, Tucker Kado-Fong, Erin Huang, Song Chen, Xinjun Zhou, Conghao Li, Jiaxuan Astrophysics of Galaxies Hydrodynamic simulations have proposed that stellar feedback and bursty star-formation can produce dark matter cores in low-mass galaxies. A key prediction is that feedback-driven gas outflow and inflow cycles can lead to ``breathing modes'' (rapid fluctuations in the global gravitational potential) which drive correlated variations in galaxy size, kinematics, and star-formation rate. In this paper, we test the dynamical effects of feedback-driven breathing modes using a sample of 103 star-forming low-mass galaxies with stellar masses between $7.9<\rm \log M_*/M_\odot<9.6$ and $0.02<z<0.19$. We measure ionized gas velocity dispersions from H$α$ emission lines and compare them to mock observations from the FIRE-2 simulations. We compare gas velocity dispersions ($\rm σ_{gas}$), stellar masses, and specific star-formation rates (sSFR). We find a positive correlation between gas velocity dispersion residuals at fixed stellar masses ($\rm Δσ_{gas}$) and sSFR in both data and simulations. However, the relation is tighter in FIRE-2 compared to the data. FIRE-2 produces more low-sSFR galaxies compared to our observational sample, however, the sSFR distributions agree after limiting both samples to a minimum sSFR. A deeper and more complete photometric sample further indicates that observed low-mass galaxies could span the full range of sSFR predicted in the FIRE-2 simulations. Our results support the existence of short-timescale dynamical effects driven by gas outflow and inflow cycles in low-mass galaxies and motivate additional tests of the breathing mode. |
| title | Testing the Stellar Feedback-driven Breathing Mode in Low-mass Galaxies with Gas Kinematics |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2510.17996 |