Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-07
A&A, 391, 841 (2002)
Astronomy and Astrophysics
Astrophysics
15 pages. A&A in press. Minor changes to make more clear some comments in the abstract and in the conclusions. One reference a
Scientific paper
10.1051/0004-6361:20020905
We consider a sample of 22 nearby clusters of galaxies observed with the Medium Energy Concentrator Spectrometer (MECS) on board of BeppoSAX. They cover the range in gas temperature between 3 and 10 keV, with bolometric X-ray luminosity between 2e44 erg/s and 6e45 erg/s. Using the de-projected gas temperature and density profiles resolved in a number of bins between 5 and 7 and obtained from this dataset only, we recover the total gravitating mass profiles for 20 objects just applying the (i) spherical symmetry and (ii) hydrostatic equilibrium assumptions. We investigate the correlations between total mass, gas temperature, luminosity at several overdensities values and find that the slopes of these relations are independent from the considered overdensity and consistent with what is predicted from the cluster scaling laws. The best-fit results on the normalization of the M-T relation are slightly lower, but still consistent considering the large errors that we measure, with hydrodynamical simulations. A segregation between relaxed and non-relaxed systems is present in each plane of these relations pointing out to a significant component in their intrinsic scatter. This segregation becomes more evident at higher overdensities and when physical quantities, like M_gas and L, that are direct function of the amount of gas observed, are considered.
de Grandi Sabrina
Ettori Stefano
Molendi Silvano
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