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Hydrodynamic Shielding and the Survival of Cold Streams by Forbes, John C.; Lin, Douglas N. C. is a scholarly article available to read on EtoBox.

What is Hydrodynamic Shielding and the Survival of Cold Streams about?

Cold clouds in hot media are quickly crushed, shredded, and then accelerated as a result of their interaction with the background gas. The persistence of cold clouds moving at substantial velocities in harsh environments is a common yet puzzling feature of many astrophysical systems, from quasar absorption lines probing galactic halos to clouds of dust passing near Sgr $A^*$. Here we run a set of idealized numerical experiments, subjecting a line of cold clouds at a series of mutual separations to a hot background wind. We find that this stream of clouds is able to shield itself from hydrodynamic destruction by accelerating the hot background material, creating a protective layer of co-moving gas. We write down a simple diffusion equation that reproduces the behavior of the simulations, and we discuss the implications for cosmological gas accretion and G2.

Author

Forbes, John C.; Lin, Douglas N. C.

Published

2018

Language

EN