期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 498, 期 3, 页码 3664-3683出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa2578
关键词
galaxies: evolution; galaxies: formation; galaxies: ISM; galaxies: star formation; cosmology: theory
资金
- National Science Foundation Graduate Research Fellowship Program [DGE-1842165]
- NSF [DGE-0948017, DGE-145000, AST-1412836, AST-1517491, AST-1715216, AST1652522, AST-1715101]
- BlueWaters - NSF [OCI-0725070, ACI-1238993]
- NASA [NNX15AB22G, 17-ATP17-0067, NAS5-26555]
- STScI [HST-GO-14681.011, HST-GO-14268.022-A, HST-AR-14293.001-A]
- Cottrell Scholar Award from the Research Corporation for Science Advancement
- COFUND/Durham Junior Research Fellowship under EU grant [609412]
- Science and Technology Facilities Council [ST/P000541/1]
- Science and Technology Facilities Council astronomy consolidated grant [ST/T000244/1]
- NASA through ATP grant [80NSSC18K1097]
- NASA through HST grants from STScI [GO14734, AR-15057, AR-15809, GO-15902]
- Heising-Simons Foundation
- Hellman Fellowship
- NASA through Hubble Fellowship - Space Telescope Science Institute [HSTJF2-51395.001-A]
- Simons Foundation
- Canada Research Chairs program
- CIERA Postdoctoral Fellowship Program (Center for Interdisciplinary Exploration and Research in Astrophysics, Northwestern University)
- STFC [ST/T000244/1, ST/P000541/1] Funding Source: UKRI
Pressure balance plays a central role in models of the interstellar medium (ISM), but whether and how pressure balance is realized in a realistic multiphase ISM is not yet well understood. We address this question by using a set of FIRE-2 cosmological zoom-in simulations of MilkyWay-mass disc galaxies, in which amultiphase ISM is self-consistently shaped by gravity, cooling, and stellar feedback. We analyse how gravity determines the vertical pressure profile as well as how the total ISM pressure is partitioned between different phases and components (thermal, dispersion/turbulence, and bulk flows). We show that, on average and consistent with previous more idealized simulations, the total ISM pressure balances the weight of the overlying gas. Deviations from vertical pressure balance increase with increasing galactocentric radius and with decreasing averaging scale. The different phases are in rough total pressure equilibrium with one another, but with large deviations from thermal pressure equilibrium owing to kinetic support in the cold and warm phases, which dominate the total pressure near the mid-plane. Bulk flows (e.g. inflows and fountains) are important at a few disc scale heights, while thermal pressure from hot gas dominates at larger heights. Overall, the total mid-plane pressure is well-predicted by the weight of the disc gas and we show that it also scales linearly with the star formation rate surface density (Sigma(SFR)). These results support the notion that the Kennicutt-Schmidt relation arises because Sigma(SFR) and the gas surface density (Sigma(g)) are connected via the ISM mid-plane pressure.
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