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Date and Time of the Query: 2019-04-22 T17:57:44 PDT
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For refcode 2006MNRAS.370..427B:
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Copyright by Royal Astronomical Society. 2006MNRAS.370..427B Galaxy orbits and the intracluster gas temperature in clusters Benatov, L.; Rines, K.; Natarajan, P.; Kravtsov, A.; Nagai, D. Abstract. In this paper, we examine how well galaxies and intracluster gas trace the gravitational potential of clusters. Utilizing mass profiles derived from gravitational lensing and X-ray observations, coupled with measured galaxy velocities, we solve for the velocity anisotropy parameter {beta}_orb_(r) using the anisotropic Jeans equation. This is done for five clusters, three at low redshift: A2199, A496 and A576 and two at high redshifts: A2390 and MS1358. We use X-ray temperature profiles obtained from Chandra and ASCA/ROSAT data to estimate {beta}_X_(r), the ratio of energy in the galaxies compared to the X-ray gas. We find that none of these clusters is strictly in hydrostatic equilibrium. We compare the properties of our sample with clusters that form in high-resolution cosmological N-body simulations that include baryonic physics. Simulations and data show considerable scatter in their {beta}_orb_(r) and {beta}_X_(r) profiles. We demonstrate the future feasibility and potential for directly comparing the orbital structure of clusters inferred from multiwavelength observations with high-resolution simulated clusters. Key words: gravitational lensing,galaxies: clusters: general,galaxies: general
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