TY - GEN
T1 - The wedding of modified dynamics and non-exotic dark matter in galaxy clusters
AU - Famaey, B.
AU - Angus, G. W.
AU - Gentile, G.
AU - Shan, H. Y.
AU - Zhao, H. S.
PY - 2008
Y1 - 2008
N2 - We summarize the status of Modified Newtonian Dynamics (MOND) in galaxy clusters. The observed acceleration is typically larger than the acceleration threshold of MOND in the central regions, implying that some dark matter is necessary to explain the mass discrepancy there. A plausible resolution of this issue is that the unseen mass in MOND is in the form of ordinary neutrinos with masses just below the experimentally detectable limit. In particular, we show that the lensing mass reconstructions of the rich clusters 1E0657-56 (the bullet cluster) and Cl0024+17 (the ring) do not pose a new challenge to this scenario. However, the mass discrepancy for cool X-ray emitting groups in which neutrinos cannot cluster pose a more serious problem, meaning that dark baryons could present a more satisfactory solution to the problem of unseen mass in MOND clusters.
AB - We summarize the status of Modified Newtonian Dynamics (MOND) in galaxy clusters. The observed acceleration is typically larger than the acceleration threshold of MOND in the central regions, implying that some dark matter is necessary to explain the mass discrepancy there. A plausible resolution of this issue is that the unseen mass in MOND is in the form of ordinary neutrinos with masses just below the experimentally detectable limit. In particular, we show that the lensing mass reconstructions of the rich clusters 1E0657-56 (the bullet cluster) and Cl0024+17 (the ring) do not pose a new challenge to this scenario. However, the mass discrepancy for cool X-ray emitting groups in which neutrinos cannot cluster pose a more serious problem, meaning that dark baryons could present a more satisfactory solution to the problem of unseen mass in MOND clusters.
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U2 - 10.1142/9789812814357_0039
DO - 10.1142/9789812814357_0039
M3 - Conference contribution
AN - SCOPUS:84866537940
SN - 9812814345
SN - 9789812814340
T3 - Proceedings of the 6th International Heidelberg Conference on Dark Matter in Astroparticle and Particle Physics, Dark 2007
SP - 393
EP - 401
BT - Proceedings of the 6th International Heidelberg Conference on Dark Matter in Astroparticle and Particle Physics, Dark 2007
PB - World Scientific Publishing Co. Pte Ltd
T2 - 6th International Heidelberg Conference on Dark Matter in Astro and Particle Physics, Dark 2007
Y2 - 24 September 2007 through 28 September 2007
ER -