astrobites | Daily Paper Summaries | 2020 Mar 10
Mitchell Cavanagh wrote:
The interstellar medium (ISM) of galaxies is a surprisingly windy place. These winds are primarily driven by feedback mechanisms, such as from the galaxy’s central black hole (AGN feedback) or from the stars themselves (stellar feedback). When stars go supernova, they enrich their surroundings with heavy elements (a.k.a metals); as Carl Sagan said, “We are made of star stuff”. The term “stellar winds” describes the overall flow of materials ejected from stars. It turns out these winds don’t just contain metals; they also contain dust. These dust grains play a significant role in regulating star formation activity, especially since molecular hydrogen (stellar fuel) readily forms on the surface of dust grains (this also has a cooling effect, further influencing star formation). Ultimately, given the intricate interplay between dust and star formation, an accurate model of dusty winds is essential towards the understanding of galaxy formation and evolution.
The authors of today’s paper present the results of high-resolution hydrodynamical simulations to see how stellar feedback-driven winds can transport dust grains throughout the ISM and out beyond the outermost reaches of the galaxy’s halo. A key aspect of this simulation is that it takes into account different types of stellar feedback, from supernovae to red giants (or, more generally, AGB stars), as well as the effects of gas and metallicity. The simulation itself uses a self-consistent dust formation and destruction model. Dust is primarily produced from stellar feedback, coupled with growth from existing dust grain, but it can also be destroyed in astrophysical shocks. Simulations were conducted with models of the Milky Way (MW) and Large Magellanic Cloud (LMC). ...
Dust Entrainment in Galactic Winds ~ Rahul Kannan et al
- arXiv.org > astro-ph > arXiv:2002.01933 > 05 Feb 2020