Thermostats, Not Engines: A New Picture of Halo Gas Regulation
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866918505706684416 |
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| author | Peiris, Hiranya V. Pontzen, Andrew Tudorache, Madalina N. Halder, Anik Thorp, Stephen Deger, Sinan Schaye, Joop Schaller, Matthieu |
| author_facet | Peiris, Hiranya V. Pontzen, Andrew Tudorache, Madalina N. Halder, Anik Thorp, Stephen Deger, Sinan Schaye, Joop Schaller, Matthieu |
| contents | We propose that black hole feedback regulates gas in massive halos by establishing an entropy ceiling; the resulting buoyant gas migrates to the virial radius with no additional energy input required. The FLAMINGO simulations support this picture: at the virial radius, outflow entropy is mass-independent for isotropic thermal feedback but depends on the solid angle of directly heated gas for jet feedback. Above a critical halo mass $M_\rm{crit} \approx 10^{13.5\text{--}14}\, M_\odot$, virial shocks overwhelm the ceiling, predicting rejuvenation of star formation in the most massive galaxies, supported by new low-redshift evidence from star formation rates and morphologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_16488 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Thermostats, Not Engines: A New Picture of Halo Gas Regulation Peiris, Hiranya V. Pontzen, Andrew Tudorache, Madalina N. Halder, Anik Thorp, Stephen Deger, Sinan Schaye, Joop Schaller, Matthieu Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies We propose that black hole feedback regulates gas in massive halos by establishing an entropy ceiling; the resulting buoyant gas migrates to the virial radius with no additional energy input required. The FLAMINGO simulations support this picture: at the virial radius, outflow entropy is mass-independent for isotropic thermal feedback but depends on the solid angle of directly heated gas for jet feedback. Above a critical halo mass $M_\rm{crit} \approx 10^{13.5\text{--}14}\, M_\odot$, virial shocks overwhelm the ceiling, predicting rejuvenation of star formation in the most massive galaxies, supported by new low-redshift evidence from star formation rates and morphologies. |
| title | Thermostats, Not Engines: A New Picture of Halo Gas Regulation |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2605.16488 |