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The X-ray Luminosity - Velocity Dispersion relation in the REFLEX Cluster Survey | | A. Ortiz-Gil
; L. Guzzo
; P. Schuecker
; H. Boehringer
; C.A. Collins
; | | Date: |
5 Nov 2003 | | Journal: | Mon.Not.Roy.Astron.Soc. 348 (2004) 325 | | Subject: | astro-ph | | Abstract: | We present an estimate of the bolometric X-ray luminosity - velocity dispersion L_x - sigma_v relation measured from a new, large and homogeneous sample of 171 low redshift, X-ray selected galaxy clusters. The linear fitting of log(L_x) - log(sigma_v) gives L_x = 10^{32.72 pm 0.08} sigma^{4.1 pm 0.3}_v erg s^{-1} h^{-2}_{50}. Furthermore, a study of 54 clusters, for which the X-ray temperature of the intracluster medium T is available, allows us to explore two other scaling relations, L_x -T and sigma_v -T. From this sample we obtain L_x propto T^{3.1 pm 0.2} and sigma_v propto T^{1.00 pm 0.16}, which are fully consistent with the above result for the L_x-sigma_v. The slopes of L_x -T and sigma_v -T are incompatible with the values predicted by self-similarity (L_x propto T^{2} propto sigma_v^4), thus suggesting the presence of non-gravitational energy sources heating up the intracluster medium, in addition to the gravitational collapse, in the early stages of cluster formation. On the other hand, the result on log(L_x) - log(sigma_v) supports the self-similar model. | | Source: | arXiv, astro-ph/0311120 | | Services: | Forum | Review | PDF | Favorites | |
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