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arXiv:0704.0381astro-ph

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

Garry W. Angus, Stacy S. McGaugh

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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.

arXiv comments
8 pages, 4 figures, 1 table, accepted for publication in MNRAS
Journal reference
DOI
doi:10.1111/j.1365-2966.2007.12403.x
Subjects
astro-phAstrophysics

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  1. New theory claims to unite Einstein's gravity with quantum mechanics 1 comment

    • > The Bullet Cluster is a particular instance where we can actually "see" the dark matter flying around, in a way MOND couldn't hope to explain This is not correct. In fact, LCDM can't even explain the Bullet Cluster [1]. The evidence is not so favourable to LCDM over MOND [2]…

      naaskingView on HNParent context

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