Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21920703l&link_type=abstract
American Astronomical Society, AAS Meeting #219, #207.03
Mathematics
Logic
Scientific paper
Galactic cluster mergers are key events in the evolution of structure in our universe. The ongoing Bullet Cluster merger (1E0657-56) is arguably one of the most interesting such events for a number of reasons, including its relatively simple structure and high surface brightness across the electromagnetic spectrum. Because of this, it has been extensively studied observationally, making this an ideal laboratory for the study of the physics of galactic clusters. In this work, we have built a detailed simulation of the merger using both SPH and grid-based codes, and including magnetohydrodynamics, plasma cooling, and adaptive mesh refinement. We constrain the simulation with data gathered from several different observational studies, including gravitational lensing and Chandra X-ray luminosity and temperature maps, then compare with Sunyaev-Zel'dovich effect measurements and cluster halo radio emission. We perform a simultaneous 2D least-squares fit to the observational data sets, rather than comparing only a few features, such as the location of subcluster centroids, as has been done previously. A simple initial configuration using two spherically symmetric clusters with NFW dark matter profiles and isothermal beta plasma profiles is found to give a good fit to the current observational morphology of the merging clusters without the need for unconventional physics or extreme infall velocities. We compare the inferred properties of the initial galaxy clusters to expectations from cosmological simulations and observations; limits on alternatives to ΛCDM and conventional gravity are given. We comment on the importance of magnetic fields and plasma cooling for obtaining a good fit to the observations, and report on the inferred relativistic electron distribution.
Farrar Glennys
Lage Craig
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