Kavli Affiliate: Peter W. Graham
| First 5 Authors: Peter W. Graham, Peter W. Graham, , ,
| Summary:
We use the dynamical heating of stars in ultrafaint dwarf (UFD) galaxies to
set limits on Massive Compact Halo Objects (MACHOs). In our analysis we study
the robustness of the bounds under uncertainties in key UFD parameters, such as
the half-light radius, stellar velocity dispersion, total halo mass and dark
matter and stellar density profiles. We apply this framework to both
well-established UFD candidates, as well as the recently discovered UFD
candidate Ursa Major III/UNIONS 1. We find that multiple UFDs yield
consistently strong limits in the mass range $10, M_odot lesssim M_rm
MACHO lesssim 10^9, M_odot$, underscoring the robustness of a previous
analysis solely based on Segue I. We also demonstrate that Ursa Major III, if
confirmed as an UFD, would improve the constraints significantly, providing the
strongest constraints on MACHO dark matter in the mass range $1,
M_odotlesssim M_rm MACHO lesssim 10^5, M_odot$.
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