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Limits on thermal conduction in galaxy clusters | | Mikhail V. Medvedev
; Adrian L. Melott
; Chris Miller
; Donald Horner
; | | Date: |
14 Mar 2003 | | Subject: | astro-ph | | Affiliation: | University of Kansas), Chris Miller (Carnegie Mellon University), Donald Horner (Space Telescope Science Institute | | Abstract: | We have calculated lower limits for the global effective thermal conductivity in a sample of 165 Abell clusters. We assumed that cluster X-ray luminosity is compensated by a conductive heat flux which we then compare with an upper limit to the temperature gradient inferred from the cluster temperature and radius. This gives a lower limit to the thermal conductivity and therefore to the relative suppression from the Spitzer conductivity, kappa_{Sp}. Not a single cluster requires super-Spitzer values of thermal conduction to balance the observed X-ray luminosity. The suppression coefficient f=kappa/kappa_{Sp} is clustered in a range 10^{-2} < f < 0.4. A weak dependence of $f$ versus $z$ is observed over $ 0 < z <0.41$. Possible biases and/or selection effects are discussed. | | Source: | arXiv, astro-ph/0303310 | | Services: | Forum | Review | PDF | Favorites | |
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