Woven by the Whirls: The growth and entrainment of cold clouds in turbulent hot winds
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ID: 315539
2026
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Abstract
Abstract Galactic and intergalactic flows often exhibit relative motion between the cold dense gas and the hot diffuse medium. Such multiphase flows – involving gas at different temperatures, densities, and ionization states – for instance, galactic winds, are frequently turbulent. However, idealized simulations typically model the winds and driven turbulence separately, despite their intertwined roles in galaxy evolution. To address this, we investigate the survival of a dense cloud in a hot wind subject to continuous external turbulent forcing. We perform 3D hydrodynamic simulations across a range of turbulent Mach numbers in the hot phase $\mathcal {M}_{\rm turb}=v_{\rm turb}/c_{\rm s, wind}$ from 0.1 to 0.7 (cs, wind and vturb being the sound speed and the turbulent velocity in the hot phase, respectively). We find that in spite of the additional subsonic turbulence, cold clouds can survive if the cooling time of the mixed gas tcool, mix is shorter than a modified destruction time $\tilde{t}_{\rm cc}$, i.e.,$t_{\rm cool,mix}/\tilde{t}_{\rm cc}<1$ where $\tilde{t}_{\rm cc}=t_{\rm cc}/(1+\left(\mathcal {M}_{\rm turb}/\left(f_{\rm mix}\mathcal {M}_{\rm wind}\right)\right)^2)^{1/2}$, where fmix ∼ 0.6 is a fudge factor. Moreover, in the ‘survival regime’, turbulence can enhance the growth of cold clouds by up to an order of magnitude because of more efficient stretching and an associated increase in the surface area. This increase in mass transfer between the phases leads to significantly faster entrainment of cold material in turbulent winds. In contrast to the narrow filamentary tails formed in laminar winds, turbulence stretches the cold gas orthogonally, dispersing it over a larger area and changing absorption line signatures.
| Reference Key |
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| Authors | Ritali Ghosh, Max Grönke, Prateek Sharma, Alankar Dutta |
| Journal | monthly notices of the royal astronomical society |
| Year | 2026 |
| DOI |
10.1093/mnras/stag1018
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| URL | |
| Keywords | Keywords not found |
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