Learning the Universe: GalactISM simulations of resolved star formation and galactic outflows across main sequence and quenched galactic environments
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| Format: | Preprint |
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2024
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| author | Jeffreson, Sarah M. R. Ostriker, Eve C. Kim, Chang-Goo Gensior, Jindra Bryan, Greg L. Davis, Timothy A. Hernquist, Lars Hassan, Sultan |
| author_facet | Jeffreson, Sarah M. R. Ostriker, Eve C. Kim, Chang-Goo Gensior, Jindra Bryan, Greg L. Davis, Timothy A. Hernquist, Lars Hassan, Sultan |
| contents | We present a suite of six high-resolution chemo-dynamical simulations of isolated galaxies, spanning observed disk-dominated environments on the star-forming main sequence, as well as quenched, bulge-dominated environments. We compare and contrast the physics driving star formation and stellar feedback amongst the galaxies, with a view to modeling these processes in cosmological simulations. We find that the mass-loading of galactic outflows is coupled to the clustering of supernova explosions, which varies strongly with the rate of galactic rotation $Ω= v_c/R$ via the Toomre length, leading to smoother gas disks in the bulge-dominated galaxies. This sets an equation of state in the star-forming gas that also varies strongly with $Ω$, so that the bulge-dominated galaxies have higher mid-plane densities, lower velocity dispersions, and higher molecular gas fractions than their main sequence counterparts. The star formation rate in five out of six galaxies is independent of $Ω$, and is consistent with regulation by the mid-plane gas pressure alone. In the sixth galaxy, which has the most centrally-concentrated bulge and thus the highest $Ω$, we reproduce dynamical suppression of the star formation efficiency (SFE) in agreement with observations. This produces a transition away from pressure-regulated star formation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2409_09114 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Learning the Universe: GalactISM simulations of resolved star formation and galactic outflows across main sequence and quenched galactic environments Jeffreson, Sarah M. R. Ostriker, Eve C. Kim, Chang-Goo Gensior, Jindra Bryan, Greg L. Davis, Timothy A. Hernquist, Lars Hassan, Sultan Astrophysics of Galaxies We present a suite of six high-resolution chemo-dynamical simulations of isolated galaxies, spanning observed disk-dominated environments on the star-forming main sequence, as well as quenched, bulge-dominated environments. We compare and contrast the physics driving star formation and stellar feedback amongst the galaxies, with a view to modeling these processes in cosmological simulations. We find that the mass-loading of galactic outflows is coupled to the clustering of supernova explosions, which varies strongly with the rate of galactic rotation $Ω= v_c/R$ via the Toomre length, leading to smoother gas disks in the bulge-dominated galaxies. This sets an equation of state in the star-forming gas that also varies strongly with $Ω$, so that the bulge-dominated galaxies have higher mid-plane densities, lower velocity dispersions, and higher molecular gas fractions than their main sequence counterparts. The star formation rate in five out of six galaxies is independent of $Ω$, and is consistent with regulation by the mid-plane gas pressure alone. In the sixth galaxy, which has the most centrally-concentrated bulge and thus the highest $Ω$, we reproduce dynamical suppression of the star formation efficiency (SFE) in agreement with observations. This produces a transition away from pressure-regulated star formation. |
| title | Learning the Universe: GalactISM simulations of resolved star formation and galactic outflows across main sequence and quenched galactic environments |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2409.09114 |