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MACHO Project Limits on Black Hole Dark Matter in the 1-30 Solar Mass Range

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arxiv astro-ph/0011506 v1 pith:H3SABYGU submitted 2000-11-28 astro-ph

The Macho collaboration: C.Alcock , R.A.Allsman , D.R.Alves , T.S.Axelrod , A.C.Becker , D.P.Bennett , K.H.Cook , N.Dalal
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A.J.Drake 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
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We report on a search for long duration microlensing events towards the Large Magellanic Cloud. We find none, and therefore put limits on the contribution of high mass objects to the Galactic dark matter. At 95% confidence level we exclude objects in the mass range 0.3 solar masses to 30.0 solar masses from contributing more than 4 times 10^11 solar masses to the Galactic halo. Combined with earlier results, this means that objects with masses under 30 solar masses 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 solar masses contribute less than 40% of the dark matter.

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Forward citations

Cited by 6 Pith papers

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  4. Primordial Black Hole Triggered Type Ia Supernovae II: Comparison with Supernova Remnants and Galactic Chemical Evolution

    astro-ph.HE 2026-06 unverdicted novelty 4.0 of 10

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  5. Constraints on Primordial Black Holes

    astro-ph.CO 2020-02 accept novelty 4.0 of 10

    Updated compilation shows PBHs are tightly constrained across 55 orders of magnitude in mass, ruling out dominant dark matter contributions except in narrow windows, with many limits carrying observational uncertainties.

  6. Stellar microlensing surveys as a probe of Primordial Black Holes: status and prospects

    astro-ph.GA 2026-02 unverdicted novelty 2.0 of 10

    Stellar microlensing surveys exclude compact objects between 10^{-11} and 10^4 solar masses from making up all dark matter under standard assumptions.

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