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

A. Spagna; D. Carollo; M. G. Lattanzi; B. Bucciarelli

doi:10.1051/0004-6361:20041080

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 journal › Review article › peer-review

11 Citations (Scopus)

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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 ρ_WD ≃ 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 language	English
Pages (from-to)	451-458
Number of pages	8
Journal	Astronomy and Astrophysics
Volume	428
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:20041080
Publication status	Published - 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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10.1051/0004-6361:20041080

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title = "Disk or halo white dwarfs? Kinematic analysis of high proper motion surveys",

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.",

keywords = "Dark matter, Galaxy: stellar content, Methods: statistical, Stars: kinematics, Surveys, White dwarfs",

author = "A. Spagna and D. Carollo and Lattanzi, {M. G.} and B. Bucciarelli",

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",

year = "2004",

month = dec,

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doi = "10.1051/0004-6361:20041080",

language = "English",

volume = "428",

pages = "451--458",

journal = "Astronomy and Astrophysics",

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TY - JOUR

T1 - Disk or halo white dwarfs? Kinematic analysis of high proper motion surveys

AU - Spagna, A.

AU - Carollo, D.

AU - Lattanzi, M. G.

AU - Bucciarelli, B.

N1 - 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

PY - 2004/12/3

Y1 - 2004/12/3

N2 - 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.

AB - 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.

KW - Dark matter

KW - Galaxy: stellar content

KW - Methods: statistical

KW - Stars: kinematics

KW - Surveys

KW - White dwarfs

UR - http://www.scopus.com/inward/record.url?scp=10844222285&partnerID=8YFLogxK

U2 - 10.1051/0004-6361:20041080

DO - 10.1051/0004-6361:20041080

M3 - Review article

AN - SCOPUS:10844222285

VL - 428

SP - 451

EP - 458

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

IS - 2

ER -

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

Abstract

Bibliographical note

Keywords

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