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Shaken, not blown: the gentle baryonic feedback of nearby starburst dwarf galaxies
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Shaken, not blown: the gentle baryonic feedback of nearby starburst dwarf galaxies
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Shaken, not blown: the gentle baryonic feedback of nearby starburst dwarf galaxies
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Paper
Shaken, not blown: the gentle baryonic feedback of nearby starburst dwarf galaxies
2022
Overview
Baryonic feedback is expected to play a key role in regulating the star formation of low-mass galaxies by producing galaxy-scale winds associated with mass-loading factors \\(\\beta\\!\\sim\\!1\\!-\\!50\\). We have tested this prediction using a sample of 19 nearby systems with stellar masses \\(10^7\\!<\\!M_\\star/{\\rm M}_{\\odot}\\!<\\!10^{10}\\), mostly lying above the main sequence of star-forming galaxies. We used MUSE@VLT optical integral field spectroscopy to study the warm ionised gas kinematics of these galaxies via a detailed modelling of their H\\(\\alpha\\) emission line. The ionised gas is characterised by irregular velocity fields, indicating the presence of non-circular motions of a few tens of km/s within galaxy discs, but with intrinsic velocity dispersion of \\(40\\)-\\(60\\) km/s that are only marginally larger than those measured in main-sequence galaxies. Galactic winds, defined as gas at velocities larger than the galaxy escape speed, encompass only a few percent of the observed fluxes. Mass outflow rates and loading factors are strongly dependent on \\(M_\\star\\), star formation rate (SFR), SFR surface density and specific SFR. For \\(M_\\star\\) of \\(10^8\\) M\\(_\\odot\\) we find \\(\\beta\\simeq0.02\\), which is more than two orders of magnitude smaller than the values predicted by theoretical models of galaxy evolution. In our galaxy sample, baryonic feedback stimulates a gentle gas cycle rather than causing a large-scale blow out.
Publisher
Cornell University Library, arXiv.org
