Paper:	Halo WD Local Space Density from the GSC-II-based Survey
Volume:	372, 15th European Workshop on White Dwarfs
Page:	113
Authors:	Carollo, D.; Bucciarelli, B.; Hodgkin, S.T.; Lattanzi, M.G.; McLean, B.; Smart, R.L.; Spagna, A.
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 the results of the GSC2 survey of halo WDs, including a description of the WD sample, and a derivation of the local space density of halo WDs by means of an accurate kinematic analysis. The local space density of these objects is shown to be only about ~ 10−5M⊙pc−3, corresponding to 0.1%–0.2% of the local dark matter.

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