The End of the MACHO Era: Limits on Halo Dark Matter from Stellar Halo Wide Binaries | Zendy

Jaiyul Yoo | Zendy; Julio Chanamé | Zendy; Andrew Gould | Zendy

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The End of the MACHO Era: Limits on Halo Dark Matter from Stellar Halo Wide Binaries

Author(s) -

Jaiyul Yoo,

Julio Chanamé,

Andrew Gould

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/380562

Subject(s) - halo , astrophysics , physics , dark matter , dark matter halo , galactic halo , power law , astronomy , galaxy , statistics , mathematics

We simulate the evolution of halo wide binaries in the presence of MAssiveCompact Halo Objects (MACHOs) and compare our results to the sample of widebinaries of Chaname & Gould (2003). The observed distribution is well fit by asingle power law for angular separation, 3.5" < theta < 900", whereas thesimulated distributions show a break in the power law whose location depends onthe MACHO mass and density. This allows us to place upper limits on MACHOdensity as a function of their assumed mass. At the 95% confidence level, weexclude MACHOs with mass M > 43Msun at the standard local halo density rho_H.This all but removes the last permitted window for a full MACHO halo for massesM > 10^{-7.5}Msun.Comment: accepted for publication in the Astrophysical Journal, 8 pages, 7 figure

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