Mass Estimation of Merging Clusters of Galaxies
We investigate the impact of mergers on the mass estimation of galaxy clusters using N-body + hydrodynamical simulation data. We estimate virial mass from these data and compare it with real mass. The results strongly depend on the observational directions, because of anisotropic velocity distribution of the member galaxies. We aLso make the X-ray surface brightness and emissivity-weighted temper ature maps from the simulation data. The mass profile is estimated from these data on the assumption of hydrostatic equilibrium. In general, mass estimation with X-ray data gives us better results than virial mass estimation. The dependence upon obser vational directions is weaker than in case of virial mass estimation. When the system is observed along the collision axis, the projected mass tends to be underestimated. This fact should be noted especially when the virial and/or X-ray mass are compared with gravitational lensing results.
galaxies clusters general hydrodynamics cosmology dark matter X-rays galaxies clusters
M. Takizawa R. Nagino K. Matsushita
Department of Physics, Yamagata University, 1-4-12 Kojirakawa-machi, Yamagata, 990-8560, Japan Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Ja
国际会议
The 10th Asian-Pacific Regional International Astronomical Union Meeting(第十届亚洲及太平洋地区天文学大会 APRIM)
昆明
英文
328-330
2008-08-03（万方平台首次上网日期，不代表论文的发表时间）