2007ApJ...654L..13A -
Astrophys. J., 654, L13-L16 (2007/January-1)
On the proof of dark matter, the law of gravity, and the mass of neutrinos.
ANGUS G.W., SHAN H.Y., ZHAO H.S. and FAMAEY B.
Abstract (from CDS):
We develop a new method to predict the density associated with weak-lensing maps of (un)relaxed clusters in a range of theories interpolating between general relativity (GR) and modified Newtonian dynamics (MOND). We apply it to fit the lensing map of the Bullet merging cluster 1E 0657-56, in order to constrain more robustly the nature and amount of collisionless matter in clusters beyond the usual assumption of spherical equilibrium (Pointecouteau & Silk) and the validity of GR on cluster scales (Clowe et al.). Strengthening the proposal of previous authors, we show that the Bullet Cluster is dominated by a collisionless–most probably nonbaryonic–component in GR as well as in MOND, a result consistent with the dynamics of many X-ray clusters. Our findings add to the number of known pathologies for a purely baryonic MOND, including its inability to fit the latest data from the Wilkinson Microwave Anisotropy Probe. A plausible resolution of all these issues and standard issues of cold dark matter (CDM) with galaxy rotation curves is the ``marriage'' of MOND with ordinary hot neutrinos of 2 eV. This prediction is just within the GR-independent maximum of neutrino mass from current β-decay experiments and will be falsifiable by the Karlsruhe Tritium Neutrino (KATRIN) experiment by 2009. Issues of consistency with strong-lensing arcs and the large relative velocity of the two clusters comprising the Bullet Cluster are also addressed.
Abstract Copyright:
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Journal keyword(s):
Cosmology: Dark Matter - Galaxies: Clusters: General - Gravitation - Cosmology: Gravitational Lensing
Simbad objects:
1
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