Disk or halo white dwarfs? Kinematic analysis of high proper motion surveys

A. Spagna*, D. Carollo, M. G. Lattanzi, B. Bucciarelli

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

11 Citations (Scopus)
5 Downloads (Pure)

Abstract

We present an alternative method for the kinematic analysis of high proper motion surveys and discuss its application to the survey of Oppenheimer et al. (2001) for the selection of reliable halo white dwarfs (WDs). The local WD space density we estimate is ρWD ≃ 1÷2 × 10-5 M pc-3, which is about an order of magnitude smaller than the value derived in Oppenheimer et al. (2001), and is consistent with the values obtained from recent reanalyses of the same data. Our result, which corresponds to a fraction of 0.1% ÷ 0.2% of the local dark matter, does not support the scenario suggested by microlensing experiments that ancient cool WDs could contribute significantly to the dark halo of the Milky Way.

Original languageEnglish
Pages (from-to)451-458
Number of pages8
JournalAstronomy and Astrophysics
Volume428
Issue number2
DOIs
Publication statusPublished - 3 Dec 2004

Bibliographical note

Copyright ESO 2004. First published in Astronomy and Astrophysics, Vol. 428, No. 2, published by EDP Sciences. The original publication is available at http://dx.doi.org/10.1051/0004-6361:20041080

Keywords

  • Dark matter
  • Galaxy: stellar content
  • Methods: statistical
  • Stars: kinematics
  • Surveys
  • White dwarfs

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