Macho project limits on black hole dark matter in the 1-30 M⊙ range

C. Alcock; R. A. Allsman; D. R. Alves; T. S. Axelrod; A. C. Becker; D. P. Bennett; K. H. Cook; N. Dalal; A. J. Drake; K. C. Freeman; M. Geha; K. Griest; M. J. Lehner; S. L. Marshall; D. Minniti; C. A. Nelson; B. A. Peterson; P. Popowski; M. R. Pratt; P. J. Quinn; C. W. Stubbs; W. Sutherland; A. B. Tomaney; T. Vandehei; D. L. Welch

doi:10.1086/319636

Macho project limits on black hole dark matter in the 1-30 M_⊙ range

C. Alcock, R. A. Allsman, D. R. Alves, T. S. Axelrod, A. C. Becker, D. P. Bennett, K. H. Cook, N. Dalal, A. J. Drake, K. C. Freeman, M. Geha, K. Griest, M. J. Lehner, S. L. Marshall, D. Minniti, C. A. Nelson, B. A. Peterson, P. Popowski, M. R. Pratt, P. J. QuinnC. W. Stubbs, W. Sutherland, A. B. Tomaney, T. Vandehei, D. L. Welch

Astronomy

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Abstract

We report on a search for long-duration microlensing events toward the Large Magellanic Cloud. We find none and therefore put limits on the contribution of high-mass objects to the Galactic dark matter. At a 95% confidence level, we exclude objects in the mass range of 0.3-30.0 M_⊙ from contributing more than 4 × 10¹¹ M_⊙ to the Galactic halo. Combined with earlier results, this means that objects with masses under 30 M_⊙ cannot make up the entire dark matter halo if the halo is of typical size. For a typical dark halo, objects with masses under 10 M_⊙ contribute less than 40% of the dark matter.

Original language	English (US)
Pages (from-to)	L169-L172
Journal	Astrophysical Journal
Volume	550
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/319636
State	Published - Apr 1 2001

Keywords

Black hole physics
Dark matter
Galaxy: halo
Galaxy: structure
Gravitational lensing

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Online availability

10.1086/319636

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Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., Cook, K. H., Dalal, N., Drake, A. J., Freeman, K. C., Geha, M., Griest, K., Lehner, M. J., Marshall, S. L., Minniti, D., Nelson, C. A., Peterson, B. A., Popowski, P., Pratt, M. R., ... Welch, D. L. (2001). Macho project limits on black hole dark matter in the 1-30 M_⊙ range. Astrophysical Journal, 550(2 PART 2), L169-L172. https://doi.org/10.1086/319636

Alcock, C, Allsman, RA, Alves, DR, Axelrod, TS, Becker, AC, Bennett, DP, Cook, KH, Dalal, N, Drake, AJ, Freeman, KC, Geha, M, Griest, K, Lehner, MJ, Marshall, SL, Minniti, D, Nelson, CA, Peterson, BA, Popowski, P, Pratt, MR, Quinn, PJ, Stubbs, CW, Sutherland, W, Tomaney, AB, Vandehei, T & Welch, DL 2001, 'Macho project limits on black hole dark matter in the 1-30 M_⊙ range', Astrophysical Journal, vol. 550, no. 2 PART 2, pp. L169-L172. https://doi.org/10.1086/319636

@article{5381360c3bd3453fa25205363a3526cd,

title = "Macho project limits on black hole dark matter in the 1-30 M⊙ range",

abstract = "We report on a search for long-duration microlensing events toward the Large Magellanic Cloud. We find none and therefore put limits on the contribution of high-mass objects to the Galactic dark matter. At a 95% confidence level, we exclude objects in the mass range of 0.3-30.0 M⊙ from contributing more than 4 × 1011 M⊙ to the Galactic halo. Combined with earlier results, this means that objects with masses under 30 M⊙ cannot make up the entire dark matter halo if the halo is of typical size. For a typical dark halo, objects with masses under 10 M⊙ contribute less than 40% of the dark matter.",

keywords = "Black hole physics, Dark matter, Galaxy: halo, Galaxy: structure, Gravitational lensing",

author = "C. Alcock and Allsman, {R. A.} and Alves, {D. R.} and Axelrod, {T. S.} and Becker, {A. C.} and Bennett, {D. P.} and Cook, {K. H.} and N. Dalal and Drake, {A. J.} and Freeman, {K. C.} and M. Geha and K. Griest and Lehner, {M. J.} and Marshall, {S. L.} and D. Minniti and Nelson, {C. A.} and Peterson, {B. A.} and P. Popowski and Pratt, {M. R.} and Quinn, {P. J.} and Stubbs, {C. W.} and W. Sutherland and Tomaney, {A. B.} and T. Vandehei and Welch, {D. L.}",

note = "Funding Information: We are very grateful for the skilled support given our project by the technical staffs at the Mount Stromlo and Siding Spring Observatories (MSSSO) and the Cerro Tololo Inter-American Observatory, and in particular we would like to thank Simon Chan, Glen Thorpe, Susannah Sabine, and Michael McDonald for their valuable assistance in obtaining the data. Work performed at the University of California Lawrence Livermore National Laboratory is supported by the US Department of Energy under contract W7405-Eng-48. Work performed by the Center for Particle Astrophysics personnel is supported in part by the Office of Science and Technology Centers of the NSF under cooperative agreement (AST 88-09616). Work performed at MSSSO is supported by the Bilateral Science and Technology Program of the Australian Department of Industry, Technology, and Regional Development. D. M. is also supported by Fondecyt 1990440. C. W. S. thanks the Packard Foundation for their generous support. W. S. is supported by a PPARC Advanced Fellowship. C. A. N. was supported in part by an NPSC Fellowship. N. D. and K. G. were supported in part by the DOE under grant DEF03-90-ER 40546. T. V. was supported in part by an IGPP grant. K. G. thanks Donald Lynden-Bell and Sasha Dolgov for asking the questions that inspired this work and the Aspen Center for Physics where some of it was performed.",

year = "2001",

month = apr,

day = "1",

doi = "10.1086/319636",

language = "English (US)",

volume = "550",

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TY - JOUR

T1 - Macho project limits on black hole dark matter in the 1-30 M⊙ range

AU - Alcock, C.

AU - Allsman, R. A.

AU - Alves, D. R.

AU - Axelrod, T. S.

AU - Becker, A. C.

AU - Bennett, D. P.

AU - Cook, K. H.

AU - Dalal, N.

AU - Drake, A. J.

AU - Freeman, K. C.

AU - Geha, M.

AU - Griest, K.

AU - Lehner, M. J.

AU - Marshall, S. L.

AU - Minniti, D.

AU - Nelson, C. A.

AU - Peterson, B. A.

AU - Popowski, P.

AU - Pratt, M. R.

AU - Quinn, P. J.

AU - Stubbs, C. W.

AU - Sutherland, W.

AU - Tomaney, A. B.

AU - Vandehei, T.

AU - Welch, D. L.

N1 - Funding Information: We are very grateful for the skilled support given our project by the technical staffs at the Mount Stromlo and Siding Spring Observatories (MSSSO) and the Cerro Tololo Inter-American Observatory, and in particular we would like to thank Simon Chan, Glen Thorpe, Susannah Sabine, and Michael McDonald for their valuable assistance in obtaining the data. Work performed at the University of California Lawrence Livermore National Laboratory is supported by the US Department of Energy under contract W7405-Eng-48. Work performed by the Center for Particle Astrophysics personnel is supported in part by the Office of Science and Technology Centers of the NSF under cooperative agreement (AST 88-09616). Work performed at MSSSO is supported by the Bilateral Science and Technology Program of the Australian Department of Industry, Technology, and Regional Development. D. M. is also supported by Fondecyt 1990440. C. W. S. thanks the Packard Foundation for their generous support. W. S. is supported by a PPARC Advanced Fellowship. C. A. N. was supported in part by an NPSC Fellowship. N. D. and K. G. were supported in part by the DOE under grant DEF03-90-ER 40546. T. V. was supported in part by an IGPP grant. K. G. thanks Donald Lynden-Bell and Sasha Dolgov for asking the questions that inspired this work and the Aspen Center for Physics where some of it was performed.

PY - 2001/4/1

Y1 - 2001/4/1

N2 - We report on a search for long-duration microlensing events toward the Large Magellanic Cloud. We find none and therefore put limits on the contribution of high-mass objects to the Galactic dark matter. At a 95% confidence level, we exclude objects in the mass range of 0.3-30.0 M⊙ from contributing more than 4 × 1011 M⊙ to the Galactic halo. Combined with earlier results, this means that objects with masses under 30 M⊙ cannot make up the entire dark matter halo if the halo is of typical size. For a typical dark halo, objects with masses under 10 M⊙ contribute less than 40% of the dark matter.

AB - We report on a search for long-duration microlensing events toward the Large Magellanic Cloud. We find none and therefore put limits on the contribution of high-mass objects to the Galactic dark matter. At a 95% confidence level, we exclude objects in the mass range of 0.3-30.0 M⊙ from contributing more than 4 × 1011 M⊙ to the Galactic halo. Combined with earlier results, this means that objects with masses under 30 M⊙ cannot make up the entire dark matter halo if the halo is of typical size. For a typical dark halo, objects with masses under 10 M⊙ contribute less than 40% of the dark matter.

KW - Black hole physics

KW - Dark matter

KW - Galaxy: halo

KW - Galaxy: structure

KW - Gravitational lensing

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SP - L169-L172

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 PART 2

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