A Universal Temperature Profile for Galaxy Clusters

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dc.creatorLoken, C.
dc.creatorNorman, M. L.
dc.creatorNelson, E.
dc.creatorBurns, J.
dc.creatorBryan, G. L.
dc.creatorMotl, P.
dc.date2002-07-03
dc.date.accessioned2026-07-07T11:08:07Z
dc.date.available2026-07-07T11:08:07Z
dc.descriptionWe investigate the predicted present-day temperature profiles of the hot, X-ray emitting gas in galaxy clusters for two cosmological models - a current best-guess LCDM model and standard cold dark matter (SCDM). Our numerically-simulated "catalogs" of clusters are derived from high-resolution (15/h kpc) simulations which make use of a sophisticated, Eulerian-based, Adaptive Mesh-Refinement (AMR) code that faithfully captures the shocks which are essential for correctly modelling cluster temperatures. We show that the temperature structure on Mpc-scales is highly complex and non-isothermal. However, the temperature profiles of the simulated LCDM and SCDM clusters are remarkably similar and drop-off as $T +AFw-propto (1+-r/a_x)^{-+AFw-delta}$ where $a_x +AFw-sim r_{vir}/1.5$ and $+AFw-delta +AFw-sim 1.6$. This decrease is in good agreement with the observational results of Markevitch et al.(1998) but diverges, primarily in the innermost regions, from their fit which assumes a polytropic equation of state. Our result is also in good agreement with a recent sample of clusters observed by BeppoSAX though there is some indication of missing physics at small radii ($r<0.2 r_{vir}$). We discuss the interpretation of our results and make predictions for new x-ray observations that will extend to larger radii than previously possible. Finally, we show that, for $r>0.2 r_{vir}$, our universal temperature profile is consistent with our most recent simulations which include both radiative cooling and supernovae feedback.
dc.description8 pages, 6 figures, accepted for publication in ApJ, full-page version of Fig. 2 at http://www.cita.utoronto.ca/+AH4-cloken/PAPERS/UTP/f2.eps
dc.identifierhttps://arxiv.org/abs/astro-ph/0207095
dc.identifierhttp://arxiv.org/abs/astro-ph/0207095
dc.identifierAstrophys.J.579:571-576,2002
dc.identifierdoi:10.1086/342825
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190027
dc.subjectAstrophysics
dc.titleA Universal Temperature Profile for Galaxy Clusters
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