The collision velocity of the bullet cluster in conventional and modified dynamics
نویسندگان
چکیده
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 (∼ 4700 km s) occur naturally in MOND. CDM can generate collision velocities of at most ∼ 3800 km s, and is only consistent with the data provided that the shock velocity has been substantially enhanced by hydrodynamical effects.
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