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Paper: The GSC2 Survey of Cool White Dwarfs
Volume: 334, 14th European Workshop on White Dwarfs
Page: 135
Authors: Carollo, D.; Spagna, A.; Lattanzi, M.G.; Smart, R.L.; Bucciarelli, B.; Terranegra, L.; Hodgkin, S.T.; McLean, B.
Abstract: Microlensing experiments (Alcock et al. 2000) have suggested that a significant part of the dark halo of the Milky Way could be composed of matter in the form of massive compact halo objects (MACHOs). Cool ancient white dwarfs (WDs) are the natural candidates. Here we present a new survey of halo WDs and evaluate the local space density using an accurate kinematic analysis. A comparison to a re-derivation of the Oppenheimer et al. (2001) results is also provided. The local space density estimated from the two independent samples is only about ~ 10−5MSolarpc−3 corresponding to 0.1%-0.2% of the local dark matter.
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