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2009

On the Reported Death of the MACHO Era

Quinn, D. P., Wilkinson, M. I., Irwin, M. J. et al.

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We present radial velocity measurements of four wide halo binary candidates from the sample in Chaname & Gould (2004; CG04) which, to date, is the only sample containing a large number of such candidates.

The four candidates that we have observed have projected separations >0.1 pc, and include the two widest binaries from the sample, with separations of 0.45 and 1.1 pc.
We confirm that three of the four CG04 candidates are genuine, including the one with the largest separation.
The fourth candidate, however, is spurious at the 5-sigma level.

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