Learning the Universe: GalactISM simulations of resolved star formation and galactic outflows across main sequence and quenched galactic environments
| Autor: | Jeffreson, Sarah M. R., Ostriker, Eve C., Kim, Chang-Goo, Gensior, Jindra, Bryan, Greg L., Davis, Timothy A., Hernquist, Lars, Hassan, Sultan |
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| Rok vydání: | 2024 |
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| Druh dokumentu: | Working Paper |
| Popis: | 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 $\Omega = v_c/R$ 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 $\Omega$, 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 $\Omega$, 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 $\Omega$, we reproduce dynamical suppression of the star formation efficiency (SFE) in agreement with observations. This produces a transition away from pressure-regulated star formation. Comment: This is a Learning the Universe Publication, accepted for publication in ApJ. 29 pages, 14 figures, and analysis code at: https://github.com/sjeffreson/pressure_regulated_SF_analysis |
| Databáze: | arXiv |
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