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We present an observational estimate of the fraction and distribution of darkmass in the innermost region of the two Galactic globular clusters NGC 6218(M12) and NGC 288. Such an assessment has been made by comparing the dynamicaland luminous mass profiles derived from an accurate analysis of the mostextensive spectroscopic and photometric surveys performed on these stellarsystems. We find that non-luminous matter constitutes more than 60% of thetotal mass in the region probed by our data (R<1.6 arcmin~r_h) in bothclusters. We have carefully analyzed the effects of binaries and tidal heatingon our estimate and ruled out the possibility that our result is a spuriousconsequence of these effects. The dark component appears to be moreconcentrated than the most massive stars suggesting that it is likely composedof dark remnants segregated in the cluster core.

Searching in the dark: the dark mass content of the Milky Way globular clusters NGC288 and NGC6218