The collision velocity of the bullet cluster in conventional and modified dynamics

Abstract

We consider the orbit of the bullet cluster 1E 0657-56 in both CDM and MOND using accurate mass models appropriate to each case in order to ascertain the maximum plausible collision velocity. Impact velocities consistent with the shock velocity (~ 4700km/s) occur naturally in MOND. CDM can generate collision velocities of at most ~ 3800km/s, and is only consistent with the data provided that the shock velocity has been substantially enhanced by hydrodynamical effects.

8 pages, 4 figures, 1 table, accepted for publication in MNRAS

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• Dwarf Spheroidals in MOND
• A massive blow for $\Lambda$CDM $-$ the high redshift, mass, and collision velocity of the interacting galaxy cluster El Gordo contradicts concordance cosmology
• The Dynamics of Subhalos in Warm Dark Matter Models
• Field equations and cosmology for a class of nonlocal metric models of MOND
• Modified Kepler's Law, Escape Speed and Two-body Problem in MOND-like Theories
• Neutrinos as galactic dark matter in the Ursa Major galaxy group?
• Physics of galactic colliders: high speed satellites in LCDM vs MONDian cosmology
• Radial structure, inflow & central mass of stationary radiative galaxy clusters
• On the MOND External Field Effect in the Solar System