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Searching For Dark Matter With Gravitational Microlensing: A Report From The MACHO Collaboration

Published online by Cambridge University Press:  25 May 2016

C.W. Stubbs
Affiliation:
Departments of Astronomy and Physics, University of Washington, Seattle, WA 98195 Center for Particle Astrophysics, UC Berkeley, CA 94720
C. Alcock
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
R.A. Allsman
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
D. Alves
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
T.S. Axelrod
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
A. Becker
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
D.P. Bennett
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
K.H. Cook
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
K.C. Freeman
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
K. Griest
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
J. Guern
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
M. Lehner
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
S.L. Marshall
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
B.A. Peterson
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
M.R. Pratt
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
P.J. Quinn
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
D. Reiss
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
A.W. Rodgers
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
W. Sutherland
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia
D.L. Welch
Affiliation:
Center for Particle Astrophysics, Berkeley, CA 94720 Lawrence Livermore National Laboratory, Livermore, CA 94550 Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611, Australia

Abstract

Gravitational microlensing is the most straightforward interpretation of the stellar brightenings that have been observed by our team and other experiments. These data have provided some of the most stringent limits to date on the nature of the Galaxy's dark matter halo. The number of events seen towards the LMC indicate that our Galaxy is not surrounded by a “standard” halo of MACHOs in the mass range of 10–6 to 0.3 solar masses. The observed optical depth towards the Galactic Center is an important constraint on the distribution of mass in the plane of the Galaxy.

Type
Chapter 7: Microlensing In the Galaxy
Copyright
Copyright © Kluwer 1996 

References

Alcock, C., et al., 1994, IAUC 6068 Google Scholar
Alcock, C., et al., 1995a, PRL, 74, 2867 CrossRefGoogle Scholar
Alcock, C., et al., 1995b, ApJ, submitted (also astro-ph/9506113) Google Scholar
Benetti, S., Pasquini, L. & West, R., 1995, A&A, 294, L37 Google Scholar
Paczynski, B, 1986, ApJL, 304, L1 CrossRefGoogle Scholar

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