Other
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.4206b&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #42.06; Bulletin of the American Astronomical Society, Vol. 30, p.873
Other
Scientific paper
High-resolution N-body simulations of rich clusters are used to investigate systematic trends in the cluster masses derived from three simple mass estimators: (1) the weak gravitational lensing shear field under the assumption of circular symmetry and an isothermal cluster potential, (2) the dynamical mass obtained from the radial velocity dispersion under the assumption of an isothermal cluster potential, and (3) the classical virial estimator. The clusters were extracted from simulations of a standard cold dark matter universe at z=0.5 and consist of order 2x 10(5) to 3x 10(5) particles of mass m_p = 10(10) M_sun. The degree of agreement between the true masses of the clusters (known a priori from the simulations) and the masses obtained from the various estimators is a function of physical scale. On scales less than 0.5 Mpc, the masses obtained from the weak lensing analysis are systematically lower than the true masses of the clusters. Both the 2-dimensional, projected mass and the 3-dimensional contained mass are underestimated by ~ 35%. The masses obtained from the radial velocity dispersion under the assumption of an isothermal potential fare better, underestimating the projected mass by ~ 20% and the 3-dimensional mass by only ~ 10%. By contrast, the classical virial estimator overestimates the 3-dimensional mass on this scale by as much as 80%. On scales comparable to the ``edges'' of the clusters (defined to be the radius inside which the mean interior overdensity is equal to 200), the lensing analysis underestimates the total 3-dimensional mass by ~ 10% but overestimates the total projected mass by ~ 50%. The isothermal dynamical mass estimator underestimates the total 3-dimensional mass by ~ 35% and the projected total mass by ~ 15%. The classical virial estimator underestimates the total 3-dimensional mass of the clusters by only ~ 10%.
Brainerd Tereasa G.
Oaxaca C. M.
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