Fig. 13.

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Left: histogram of the velocities of the galaxy members of the NGC 507 group. The best-fit Gaussian distribution of the Gaussian mixture model MCLUST is also shown. Right: velocity dispersion profile of the NGC 507 group, where the galaxy NGC 507 is assumed to be the centre of the group. Bins contain ten galaxies each and the 1σ ‘jacknife’ errors are shown. The solid line shows the expected value of dispersion velocity assuming density–energy equipartition between IGrM and galaxies, i.e. βspec = 1, assuming a temperature for the IGrM of kT = 1.19 keV.
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