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- W2898153234 abstract "We develop a semi-analytic model to explore the physical properties of cool pressure-confined circumgalactic clouds with mass ranging from 10 to |$10^{8} , rm M_{odot }$| in a hot diffuse halo. We consider physical effects that control the motion and mass-loss of the clouds, and estimate the lifetime and the observed properties of individual cool gas clouds inferred from the cloudy simulation. Our results show that the cool pressure-confined gas clouds have physical properties consistent with absorption line systems with neutral hydrogen column densities |$N_{rm H,{small I}}ge 10^{18.5} rm cm^{-2}$| such as strong metal absorbers, sub-damped Lyman alpha systems, and damped Lyman alpha systems. The cool circumgalactic clouds are transient due to evaporation and recycling and therefore a constant replenishment is needed to maintain the cool cirumgalactic medium (CGM). We further model the ensemble properties of the cool CGM with clouds originated from outflows, inflows, or/and in situ formation with a range of initial cloud mass function and velocity distribution. We find that only with a certain combination of parameters, an outflow model can broadly reproduce three cool gas properties around star-forming galaxies simultaneously: the spatial distribution, down-the-barrel outflow absorption, and gas velocity dispersion. Both a constant in situ model and gas inflow model can reproduce the observed covering fractions of high |$rm mathit{ N}_{H,{small I}}$| gas around passive galaxies but they fail to reproduce sufficient number of low |$rm mathit{ N}_{H,{small I}}$| systems. The limitations and the failures of the current models are discussed. Our results illustrate that semi-analytic modelling is a promising tool to understand the physics of the cool CGM which is usually unresolved by state-of-the-art cosmological hydrodynamic simulations." @default.
- W2898153234 created "2018-11-02" @default.
- W2898153234 creator A5003933163 @default.
- W2898153234 creator A5032581326 @default.
- W2898153234 date "2019-03-27" @default.
- W2898153234 modified "2023-10-16" @default.
- W2898153234 title "Exploring the physical properties of the cool circumgalactic medium with a semi-analytic model" @default.
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- W2898153234 doi "https://doi.org/10.1093/mnras/stz839" @default.
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