Abstract By analyzing the azimuthal variations of total gravitating mass profiles in the central 300 h-171 kpc regions of four galaxy clusters with Chandra data, we find that the azimuthally-averaged mass profiles may have been systematically underestimated by 16+9-8% at 1σ significance in the 50-100 h-171 kpc regions, probably due to the prevailing existence of 2-D hot gas substructures in 100-300 h-171 kpc. The mass biases become negligible (-7+11-9 %) at > 150 h-171 kpc. We confirm the results that the gas temperature maps can be used to probe the departure from hydrostatic equilibrium and help quantify the systematic biases in X-ray mass measurements in the central regions of clusters.
Keywords cosmology: dark matter — galaxies: clusters: general — galaxies: inter- galactic medium — X-rays: galaxies: clusters
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