Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19916115t&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #161.15; Bulletin of the American Astronomical Society, Vol. 34, p.574
Astronomy and Astrophysics
Astronomy
Scientific paper
Chandra x-ray observations of the hot halo gas in galaxy clusters have resulted in the discovery of structures and phenomena not previously seen by x-ray telescopes or predicted by numerical simulations. Steep x-ray flux gradients that are not axisymmetric have been observed (Markevitch et al 2000, Vikhlinin et al 2000, Mazzotta et al, 2001). They have been given the moniker, `cold fronts' and have been attributed to movement of the cluster cores and are thought to be stabilized by magnetic fields. I report on preliminary work using high resolution numerical simulations of cluster mergers which indicate that post-merger oscillations of the primary cluster core are responsible for the motion of the cool core gas with respect to the surrounding hot gas. The simulations solve the hydrodynamics using SPH. The oscillations provide a previously unexploitable tool for studying the dark-matter density profile of clusters.
Henriksen Mark J.
Tittley Eric R.
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