Globular clusters in modified Newtonian dynamics: velocity-dispersion profiles from self-consistent models

Abstract

We test the modified Newtonian dynamics (MOND) theory with the velocity-dispersion profiles of Galactic globular clusters populating the outermost region of the Milky Way halo, where the Galactic acceleration is lower than the characteristic MOND acceleration a_0. For this purpose, we constructed self-consistent, spherical models of stellar systems in MOND, which are the analogues of the Newtonian King models. The models are spatially limited, reproduce well the surface-brightness profiles of globular clusters, and have velocity-dispersion profiles that differ remarkably in shape from the corresponding Newtonian models. We present dynamical models of six globular clusters, which can be used to efficiently test MOND with the available observing facilities. A comparison with recent spectroscopic data obtained for NGC2419 suggests that the kinematics of this cluster might be hard to explain in MOND.

13 pages, 9 figures, accepted for publication by MNRAS

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Cited by in corpus (27)

• Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
• Halo globular clusters observed with AAOmega: dark matter content, metallicity and tidal heating
• The globular cluster NGC 2419: a crucible for theories of gravity
• Hubble Space Telescope proper motion (HSTPROMO) catalogs of Galactic globular clusters. III. Dynamical distances and mass-to-light ratios
• Discovery of tidal tails around the distant globular cluster Palomar 14
• AAOmega spectroscopy of 29 351 stars in fields centered on ten Galactic globular clusters
• The outskirts of globular clusters as modified gravity probes
• The non-segregated population of blue straggler stars in the remote globular cluster Palomar 14
• Flattened velocity dispersion profiles in Globular Clusters: Newtonian tides or modified gravity?
• Mass segregation in the outer halo globular cluster Palomar 14
• Distant star clusters of the Milky Way in MOND
• Radial-orbit instability in modified Newtonian dynamics
• A Monte Carlo analysis of the velocity dispersion of the globular cluster Palomar 14
• Abundance analysis of the outer halo globular cluster Palomar 14
• Kinematics of a globular cluster with an extended profile: NGC5694
• MONDian dynamical modeling of NGC 288 with $\beta \ne 0$
• The massive elliptical galaxy NGC 4649 from the perspective of extended gravity
• Isothermal distributions in MONDian gravity as a simple unifying explanation for the ubiquitous $\rho \propto r^{-3}$ density profiles in tenuous stellar halos
• The MOND External Field Effect on the Dynamics of the Globular Clusters: General Considerations and Application to NGC 2419
• Application of three-body stability to globular clusters: II. Observed velocity dispersions
• New Determination of Fundamental Properties of Palomar 5 Using Deep DESI Imaging Data
• Gravitational anomalies signaling the breakdown of classical gravity
• Dark Coincidences: Small-Scale Solutions with Refracted Gravity and MOND
• Observational dynamics of low-mass stellar systems
• The kinematics of star clusters undergoing gas expulsion in Newtonian and Milgromian dynamics
• Refracted Gravity Solutions from Small to Large Scales
• Testing QUMOND theory with Galactic globular clusters in a weak external field