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- W3099663003 abstract "We present a statistical comparison of three different estimates of cluster mass, namely, the dynamical masses obtained from the velocity dispersion of optical galaxies, the X-ray masses measured from the temperature of X-ray-emitting gas under the assumption of isothermal hydrostatic equilibrium, and the gravitational lensing masses derived from the strong/weak distortions of background galaxy images. Using a sample of 29 lensing clusters available in literature, we show that the dynamical masses are in agreement with the gravitational lensing masses while the X-ray method has systematically underestimated cluster masses by a factor of 2-3 as compared with the others. These results imply that galaxies indeed trace the gravitational potential of their clusters and that there is no bias between the velocities of the dark matter particles and the galaxies in clusters. The X-ray cluster mass discrepancy probably arises from the simplification in the models for the X-ray gas distribution and dynamical evolution." @default.
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- W3099663003 date "1997-07-01" @default.
- W3099663003 modified "2023-10-15" @default.
- W3099663003 title "A Statistical Comparison of Cluster Mass Estimates from Optical/X‐Ray Observations and Gravitational Lensing" @default.
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- W3099663003 doi "https://doi.org/10.1086/304235" @default.
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