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Growth and Structure of Multiphase Gas in the Cloud-crushing Problem with Cooling by Vijit Kanjilal; Alankar Dutta; Prateek Sharma is a Physics and Astronomy article available to read on EtoBox.

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## ABSTRACT We revisit the problem of the growth of dense/cold gas in the cloud-crushing set-up with radiative cooling. The relative motion between the dense cloud and the diffuse medium produces a turbulent boundary layer of mixed gas with a short cooling time. This mixed gas may explain the ubiquity of the range of absorption/emission lines observed in various sources such as the circumgalactic medium and galactic/stellar/active galactic nucleus outflows. Recently, Gronke & Oh showed that the efficient radiative cooling of the mixed gas can lead to continuous growth of the dense cloud. They presented a threshold cloud size for the growth of dense gas that was contradicted by the more recent works of Li et al. & Sparre et al. These thresholds are qualitatively different as the former is based on the cooling time of the mixed gas whereas the latter is based on the cooling time of the hot gas. Our simulations agree with the threshold based on the cooling time of the mixed gas. We argue that the radiative cloud-crushing simulations should be run long enough to allow for the late-time growth of the dense gas due to cooling of the mixed gas but not so long that the background gas cools

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Author

Vijit Kanjilal; Alankar Dutta; Prateek Sharma

Publisher

Oxford University Press (OUP)

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)