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+/-0.08)sigma(v)(4.1+/-0.3) erg s(-1) h(50)(-2). 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 proportional to T3.1+/-0.2 and sigma(v) proportional to T1.00+/-0.6, which are fully consistent with the above result for L-x-sigma(v). The slopes of L-x-T and sigma(v)-T are incompatible with the values predicted by selfsimilarity (L-x proportional to T-2 proportional to 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.
The X-ray luminosity-velocity dispersion relation in the REFLEX cluster survey / A. Ortiz-Gil, L. Guzzo, P. Schuecker, H. Böhringer, C.A. Collins. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 348:1(2004), pp. 325-332. [10.1111/j.1365-2966.2004.07371.x]
The X-ray luminosity-velocity dispersion relation in the REFLEX cluster survey
L. Guzzo;
2004
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+/-0.08)sigma(v)(4.1+/-0.3) erg s(-1) h(50)(-2). 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 proportional to T3.1+/-0.2 and sigma(v) proportional to T1.00+/-0.6, which are fully consistent with the above result for L-x-sigma(v). The slopes of L-x-T and sigma(v)-T are incompatible with the values predicted by selfsimilarity (L-x proportional to T-2 proportional to 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.File | Dimensione | Formato | |
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