Formation of cold fronts in mergers of massive galaxy clusters

Details Formation of cold fronts in mergers of massive galaxy clusters Formation of cold fronts in mergers of massive galaxy clusters

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..703..391m&link_type=abstract

PLASMAS IN THE LABORATORY AND IN THE UNIVERSE: New Insights and New Challenges. AIP Conference Proceedings, Volume 703, pp. 391

Mathematics

Logic

Intracluster Matter, Cooling Flows, Galaxy Mergers, Collisions, And Tidal Interactions, Magnetohydrodynamics And Plasmas

Scientific paper

Using adiabatic cosmological simulations of the intracluster plasma, we follow the evolution of two symmetric cold fronts developing in the remnant of a violent z=0.3 massive cluster merger. The simulated cold fronts are very similar to those recently singled out in X-ray observations of the intracluster medium, supporting the merger hypothesis for the origin of at least some of the cold fronts. The cold fronts are preceded by an almost spherical bow shock which originates at the core and disappears after 1 Gyr, while the cold fronts survive longer until z~0.
We trace back the gas constituting the cold fronts and find it initially associated with the two dense cores of the merging subclusters. Following the energy of this dense gas clearly shows how part of it can escape from the local dark matter potential well of the subcluster cores: the process occurs as the subclumps reach their apocentre in an eccentric orbit and is due to the global cluster pressure gradient. The fraction of the gas of each of the dense subcluster cores which is liberated in the outbound direction then cools as it expands adiabatically and constitutes the cold fronts.

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