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Event Detail Information

Event Detail Information

Astronomy Colloquium: "The Physics of Gas Sloshing in the Cores of Galaxy Clusters"

Speaker John ZuHone, NASA GFSC
Date Feb 25, 2014
Time 3:45 pm  
Location Astronomy 134
Sponsor Astronomy Department
Event type Colloquia
Views 4861
Many X-ray observations of relaxed galaxy clusters reveal the presence of sharp, spiral-shaped discontinuities in the surface brightness of the X-ray emitting gas. Spectral analysis of these features shows that the colder gas is on the brighter side, hence they have been dubbed "cold fronts." These features arise naturally in simulations from the cool-core gas "sloshing" in the gravitational potential. Their sharpness and stability has important implications for the microphysics of the ICM. The sloshing motions may have other effects, such as contributing to the heating of the cluster core and the acceleration of relativistic particles. I will present simulations of gas sloshing in clusters, explain their formation and evolution, and discuss the implications for the physics of the ICM, including fresh results on heat conduction, viscosity, and radio mini-halos. I will also briefly discuss yt, an emerging software toolkit for analyzing astrophysical data from simulations and other datasets.
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