TY - JOUR
T1 - The collision velocity of the bullet cluster in conventional and modified dynamics
AU - Angus, G. W.
AU - McGaugh, S. S.
PY - 2008/1
Y1 - 2008/1
N2 - We consider the orbit of the bullet cluster 1E 0657-56 in both cold dark matter (CDM) and Modified Newtonian Dynamics (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-1) occur naturally in MOND. CDM can generate collision velocities of at most ∼3800 km s-1, and is only consistent with the data, provided that the shock velocity has been substantially enhanced by hydrodynamical effects.
AB - We consider the orbit of the bullet cluster 1E 0657-56 in both cold dark matter (CDM) and Modified Newtonian Dynamics (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-1) occur naturally in MOND. CDM can generate collision velocities of at most ∼3800 km s-1, and is only consistent with the data, provided that the shock velocity has been substantially enhanced by hydrodynamical effects.
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U2 - 10.1111/j.1365-2966.2007.12403.x
DO - 10.1111/j.1365-2966.2007.12403.x
M3 - Article
AN - SCOPUS:37849049946
SN - 0035-8711
VL - 383
SP - 417
EP - 423
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -