Bibcode
Hernandez, X.; Cortés, R. A. M.; Scarpa, R.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 464, Issue 3, p.2930-2936
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1
2017
Citations
9
Refereed citations
8
Description
NGC 288 is a diffuse Galactic globular cluster; it is remarkable in that
its low density results in internal accelerations being below the
critical MOND a0 acceleration throughout. This makes it an
ideal testing ground for MONDian gravity, as the details of the largely
unknown transition function between the Newtonian and modified regimes
become unimportant. Further, exact analytical solutions exist for
isothermal spherical equilibrium structures in MOND, allowing for
arbitrary values of the anisotropy parameter, β. In this paper, we
use observations of the velocity dispersion profile of NGC 288, which is
in fact isothermal, as dynamical constraints on MONDian models for this
cluster, where the remaining free parameters are adjusted to fit the
observed surface brightness profile. We find that the optimal fit
requires β = 0, an isotropic solution with a total mass of 3.5
± 1.1 × 104 M⊙.
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