Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-03
Mon.Not.Roy.Astron.Soc.370:427-434,2006
Astronomy and Astrophysics
Astrophysics
9 pages, 6 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10490.x
In this paper we examine how well galaxies and intra-cluster 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 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. With X-ray temperature profiles obtained from Chandra and ASCA/ROSAT data, we estimate the ratio of energy in the galaxies compared to the X-ray gas. We find that none of these clusters is strictly in hydro-static 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 both these profiles. We demonstrate the future feasibility and potential for directly comparing the orbital structure of clusters inferred from multi-wavelength observations with high resolution simulated clusters.
Benatov Latchezar
Kravtsov Andrey
Nagai Daisuke
Natarajan Priyamvada
Rines Ken
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