Contributed Talk - Splinter ISM

Thursday, 24 September 2020, 16:49   (virtual room F)

Dense cloud survival in radiative multi-phase outflows

Wladimir E. Banda-Barragán
Hamburger Sternwarte, Universität Hamburg

I discuss the evolution of dense radiative clouds embedded in supersonic outflows. In my 3D simulations fractal layers containing multiple clouds are overrun by shocks, and individual clumps are able to radiate while they accelerate downstream. I show that: a) outflowing material develops a rain-like filamentary morphology, b) mixed entrained material along the outflow retains some information on the initial density distribution at the launching site, and c) strong radiative cooling can replenish high-density gas along the outflow. Thus, while individual clumps are disrupted by shocks and dynamical instabilities, dense gas reforms downstream ensuring that warm and cold clouds are present in the multi-phase flow. At the end of this talk, I compare the dynamical and morphological properties of outflowing gas in my simulations to those of the atomic gas phases in observed galactic outflows.