Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-02-23
New Astron.Rev. 42 (1998) 145-148; Mon.Not.Roy.Astron.Soc. 298 (1998) L1-L5
Astronomy and Astrophysics
Astrophysics
6 pages, LaTeX (mn.sty), 2 figures. To appear in MNRAS Letters
Scientific paper
10.1046/j.1365-8711.1998.01780.x
A tight mass-temperature relation, M(r)/r ~ T_X, is expected in most cosmological models if clusters of galaxies are homologous and the intracluster gas is in global equilibrium with the dark matter. We here calibrate this relation using 8 clusters with well-defined global temperatures measured with ASCA and masses inferred from weak and strong gravitational lensing. The surface lensing masses are deprojected in accordance with N-body simulations and analytic results. The data are well-fit by the mass-temperature relation and are consistent with the empirical normalisation found by Evrard et al. (1996) using gasdynamic simulations. Thus, there is no discrepancy between lensing and X-ray derived masses using this approach. The dispersion around the relation is 27 per cent, entirely dominated by observational errors. The next generation of X-ray telescopes combined with wide-field HST imaging could provide a sensitive test of the normalisation and intrinsic scatter of the relation resulting in a powerful and expedient way of measuring masses of clusters of galaxies. In addition, as M(r)/r (as derived from lensing) is dependent on the cosmological model at high redshift, the relation represents a new tool for determination of cosmological parameters, notably the cosmological constant Lambda.
Hjorth Jens
Oukbir Jamila
van Kampen Eelco
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