期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 462, 期 2, 页码 1937-1951出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw1779
关键词
methods: data analysis; techniques: radial velocities; stars: kinematics and dynamics; stars: luminosity function, mass function; stars: Population II; globular clusters: individual: NGC6218, NGC288
资金
- European Research Council [ERC-2010-AdG-267675, ERCStG-335936]
- Very Large Telescope of the ESO, Cerro Paranal, Chile [68.D-0212, 69.D-0582, 071.D-0131, 073.D-0211, 074.A-0508, 075.D-0043, 087.D-0276, 088.B-0403, 193.B-0936, 193.D-0232]
- NASA [NAS 5-26555, GO-10775]
We present an observational estimate of the fraction and distribution of dark mass 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 dynamical and luminous mass profiles derived from an accurate analysis of the most extensive spectroscopic and photometric surveys performed on these stellar systems. We find that non-luminous matter constitutes more than 60 per cent of the total mass in the region probed by our data (R < 1.6 arcmin similar to r(h)) in both clusters. We have carefully analysed the effects of binaries and tidal heating on our estimate and ruled out the possibility that our result is a spurious consequence of these effects. The dark component appears to be more concentrated than the most massive stars suggesting that it is likely composed of dark remnants segregated in the cluster core.
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