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

Free access article

Issue		A&A Volume 389, Number 3, July III 2002


Page(s)		L69 - L73
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:20020827

A&A 389, L69-L73 (2002)
DOI: 10.1051/0004-6361:20020827

Letter

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

B. Goldman^{1, 2, 3}, C. Afonso^{1, 2, 3}, Ch. Alard⁴, J.-N. Albert⁵, A. Amadon¹, J. Andersen⁶, R. Ansari⁵, É. Aubourg¹, P. Bareyre^{1, 2}, F. Bauer¹, J.-Ph. Beaulieu⁷, G. Blanc¹, A. Bouquet², S. Char, X. Charlot¹, F. Couchot⁵, Ch. Coutures¹, F. Derue¹, R. Ferlet⁷, P. Fouqué^{8, 9}, J.-F. Glicenstein¹, A. Gould^{2, 10}, D. Graff¹¹, M. Gros¹, J. Haïssinski⁵, C. Hamadache¹, J.-Ch. Hamilton², D. Hardin¹², J. de Kat¹, A. Kim¹, Th. Lasserre¹, L. Le Guillou¹, É. Lesquoy^{1, 7}, C. Loup⁷, Ch. Magneville¹, B. Mansoux⁵, J.-B. Marquette⁷, É. Maurice¹³, A. Maury⁹, A. Milsztajn¹, M. Moniez⁵, N. Palanque-Delabrouille¹, O. Perdereau⁵, L. Prévot¹³, N. Regnault⁵, J. Rich¹, M. Spiro¹, P. Tisserand¹, A. Vidal-Madjar⁷, L. Vigroux¹ and S. Zylberajch¹ - The EROS collaboration

¹ CEA, DSM, DAPNIA, Centre d'Études de Saclay, 91191 Gif-sur-Yvette Cedex, France
² Collège de France, Physique Corpusculaire et Cosmologie, IN2P3 CNRS, 11 pl. M. Berthelot, 75231 Paris Cedex, France
³ NMSU, Department of Astronomy, Las Cruces, New Mexico 88003, USA
⁴ DASGAL, 77 avenue de l'Observatoire, 75014 Paris, France
⁵ Laboratoire de l'Accélérateur Linéaire, IN2P3 CNRS, Université Paris-Sud, 91405 Orsay Cedex, France
⁶ Astronomical Observatory, Copenhagen University, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
⁷ Institut d'Astrophysique de Paris, INSU CNRS, 98bis boulevard Arago, 75014 Paris, France
⁸ LESIA, Observatoire de Meudon, 92195 Meudon Cedex, France
⁹ ESO, Casilla 19001, Santiago 19, Chile
¹⁰ Ohio State University, Department of Astronomy, Columbus, OH 43210, USA
¹¹ University of Michigan, Department of Astronomy, Ann Arbor, MI 48109, USA
¹² LPNHE, IN2P3-CNRS-Universités Paris VI et VII, 4 place Jussieu, 75252 Paris Cedex 05, France
¹³ Observatoire de Marseille, 2 pl. Le Verrier, 13248 Marseille Cedex 04, France

(Received 4 March 2002 / Accepted 3 June 2002)

Abstract
We are conducting a $377^{\circ 2}$ 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 $250^{\circ 2}$ for which we possess three epochs, and applying selection criteria designed to isolate halo-type objects, we find no candidates in a $5500\,{\rm pc}^3$ 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 and . The same conclusion applies to a 14 Gyr halo composed of white dwarfs with hydrogen atmosphere, as modeled by Chabrier.

Key words: Galaxy: halo -- Galaxy: kinematics and dynamics -- dark matter -- white dwarfs

Offprint request: B.Goldman, bgoldman@nmsu.edu.

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