EROS 2 proper motion survey: Constraints on the halo white dwarfs

Abstract

We are conducting a 377-square-degree proper motion survey in the ~V and I bands in order to determine the cool white dwarf contribution to the Galactic dark matter. Using the 250 square degrees for which we possess three epochs, and applying selection criteria designed to isolate halo-type objects, we find no candidates in a 5500 pc^3 effective volume for old, fast M_V=17 white dwarfs. We check the detection efficiency by cross-matching our catalogue with Luyten's NLTT catalogue. The halo white dwarf contribution cannot exceed 5% (95% C.L.) for objects with M_V=17 and 1<V-I<1.5. The same conclusion applies to a 14Gyr halo composed of white dwarfs with hydrogen atmosphere, as modeled by Chabrier (99).

arXiv comment5 pages, 2 postscript figures, accepted for publication in A&A. Requires aa,epsfig,slashbox,natbib

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Cited by in corpus (12)

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• A New Prescription for Protogalactic Feedback and Outflows: Where Have All the Baryons Gone?
• Bulge Microlensing Optical Depth from EROS 2 observations
• High proper motion white dwarfs and halo dark matter
• Monte Carlo simulations of the halo white dwarf population
• The white dwarf luminosity function
• The contribution of red dwarfs and white dwarfs to the halo dark matter
• The contribution of Oxygen-Neon white dwarfs to the MACHO content of the Galactic Halo
• Dark halo baryons not in ancient halo white dwarfs
• White dwarfs with hydrogen-deficient atmospheres and the dark matter content of the Galaxy
• EROS light curve data base