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Galaxy orbits and the intracluster gas temperature in clusters

Benatov, L. and Rines, K. and Natarajan, P. and Kravtsov, A. and Nagai, D. (2006) Galaxy orbits and the intracluster gas temperature in clusters. Monthly Notices of the Royal Astronomical Society, 370 (1). pp. 427-434. ISSN 0035-8711. doi:10.1111/j.1365-2966.2006.10490.x.

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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 β_(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 β_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 β_(orb)(r) and β_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.

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Nagai, D.0000-0002-6766-5942
Additional Information:© 2006 The Authors. Journal compilation © 2006 RAS. Accepted 2006 April 26. Received 2006 April 1; in original form 2005 December 6. Article first published online: 8 Jun. 2006. This research has made use of the NASA/IPAC Extragalactic Database which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the NASA. PN acknowledges financial support from proposals HST-AR-10302.01-A and HST-GO-09722.06-A provided by NASA through a grant from STScI, which is operated by AURA.
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Subject Keywords:gravitational lensing; galaxies: clusters: general; galaxies: general.
Issue or Number:1
Record Number:CaltechAUTHORS:20110217-084248636
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Official Citation:Galaxy orbits and the intracluster gas temperature in clusters (pages 427–434) L. Benatov, K. Rines, P. Natarajan, A. Kravtsov and D. Nagai Article first published online: 8 JUN 2006; DOI: 10.1111/j.1365-2966.2006.10490.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22340
Deposited By: Ruth Sustaita
Deposited On:17 Feb 2011 17:09
Last Modified:09 Nov 2021 16:04

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