Macho project limits on black hole dark matter in the 1-30 M circle-dot 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, Peter QuinnC.W. Stubbs, W. Sutherland, A.B. Tomaney, T. Vandehei, D.L. Welch

    Research output: Contribution to journalArticlepeer-review

    272 Citations (Scopus)


    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-circle dot from contributing more than 4 x 10(11) M-circle dot to the Galactic halo. Combined with earlier results, this means that objects with masses under 30 M-circle dot 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-circle dot contribute less than 40% of the dark matter.
    Original languageEnglish
    Pages (from-to)L169-L172
    JournalThe Astrophysical Journal
    Issue number2
    Publication statusPublished - 2001


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