A universal velocity dispersion profile for pressure supported systems: evidence for MONDian gravity across 7 orders of magnitude in mass

Abstract

For any MONDian extended theory of gravity where the rotation curves of spiral galaxies are explained through a change in physics rather than the hypothesis of dark matter, a generic dynamical behavior is expected for pressure supported systems: an outer flattening of the velocity dispersion profile occurring at a characteristic radius, where both the amplitude of this flat velocity dispersion and the radius at which it appears are predicted to show distinct scalings with the total mass of the system. By carefully analyzing the dynamics of globular clusters and elliptical galaxies, we are able to significantly extend the astronomical diversity of objects in which MONDian gravity has been tested, from spiral galaxies, to the much larger mass range covered by pressure supported systems. We show that a universal projected velocity dispersion profile accurately describes various classes of pressure supported systems, and further, that the expectations of extended gravity are met, across seven orders of magnitude in mass. These observed scalings are not expected under dark matter cosmology, and would require particular explanations tuned at the scales of each distinct astrophysical system.

arXiv commentAccepted for publication in ApJ, 11 pages, 5 figures 1 table

References in corpus (50)

• The Sloan Digital Sky Survey: Technical Summary
• Extended Theories of Gravity
• Relativistic gravitation theory for the MOND paradigm
• CALIFA, the Calar Alto Legacy Integral Field Area survey: I. Survey presentation
• The SAURON project - IV. The mass-to-light ratio, the virial mass estimator and the fundamental plane of elliptical and lenticular galaxies
• Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
• The ATLAS3D project - III. A census of the stellar angular momentum within the effective radius of early-type galaxies: unveiling the distribution of Fast and Slow Rotators
• Resolved Massive Star Clusters in the Milky Way and its Satellites: Brightness Profiles and a Catalogue of Fundamental Parameters
• Modified Newtonian Dynamics as an Alternative to Dark Matter
• Accurate masses for dispersion-supported galaxies
• The Radial Acceleration Relation in Rotationally Supported Galaxies
• Emergent Gravity and the Dark Universe
• The SAURON project - III. Integral-field absorption-line kinematics of 48 elliptical and lenticular galaxies
• The Baryonic Tully-Fisher Relation of Gas Rich Galaxies as a Test of LCDM and MOND
• One Law To Rule Them All: The Radial Acceleration Relation of Galaxies
• Modified Newtonian Dynamics in the Milky Way
• CALIFA, the Calar Alto Legacy Integral Field Area survey: IV. Third Public data release
• CALIFA: a diameter-selected sample for an integral field spectroscopy galaxy survey
• N-body modeling of globular clusters: Masses, mass-to-light ratios and intermediate-mass black holes
• Tidal Tails of Star Clusters
• Measuring the escape velocity and mass profiles of galaxy clusters beyond their virial radius
• Halo globular clusters observed with AAOmega: dark matter content, metallicity and tidal heating
• A statistical investigation of the mass discrepancy-acceleration relation
• Testing Modified Newtonian Dynamics with Rotation Curves of Dwarf and Low Surface Brightness Galaxies
• The orbits of 48 globular clusters in a Milky-Way-Like Barred Galaxy
• Properties of Isolated Disk Galaxies
• The Luminosity Function of Low-Redshift Abell Galaxy Clusters
• The dark matter halo of NGC 1399 - CDM or MOND?
• Testing Newtonian Gravity with AAOmega: Mass-to-Light Profiles of Four Globular Clusters
• Testing Newtonian gravity with distant globular clusters: NGC1851 and NGC1904
• AAOmega spectroscopy of 29 351 stars in fields centered on ten Galactic globular clusters
• Testing Newtonian Gravity with AAOmega: Mass-To-Light Profiles and Metallicity Calibrations From 47 Tuc and M55
• The outskirts of globular clusters as modified gravity probes
• Six New Galactic Orbits of Globular Clusters in a Milky-Way-Like Galaxy
• Using globular clusters to test gravity in the weak acceleration regime: NGC 7099
• The power of teaming up HST and Gaia: the first proper motion measurement of the distant cluster NGC 2419
• A natural approach to extended Newtonian gravity: tests and predictions across astrophysical scales
• Flattened velocity dispersion profiles in Globular Clusters: Newtonian tides or modified gravity?
• Modified gravity models and the central cusp of dark matter halos in galaxies
• Testing Newtonian gravity in the low acceleration regime with globular clusters: the case of omega Centauri revisited
• Understanding the internal dynamics of elliptical galaxies without non-baryonic dark matter
• MOND and IMF variations in early-type galaxies from $ATLA{S}^{3D}$
• NGC 2419 does not challenge MOND
• Gravitational lensing with $f(\chi )={\chi }^{3/2}$ gravity in accordance with astrophysical observations
• Current data on the globular cluster Palomar 14 are not inconsistent with MOND
• Dynamics of Elliptical Galaxies with Planetary Nebulae in Modified Newtonian Dynamics
• MOND as the weak field limit of an extended metric theory of gravity with torsion
• 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
• Application of three-body stability to globular clusters: II. Observed velocity dispersions

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• From galactic bars to the Hubble tension: weighing up the astrophysical evidence for Milgromian gravity
• Testing Gravity with wide binary stars like $\alpha$ Centauri
• Testing Modified Gravity Theories via Wide Binaries and GAIA
• An elusive dark central mass in the globular cluster M4
• A Test of MONDian Gravity in $\sim$300 pressure supported elliptical galaxies from the MaNGA survey
• Time evolution of the local gravitational parameters and gravitational wave polarizations in a relativistic MOND theory
• Asymptotic kinematics of Globular Clusters: the emergence of a Tully-Fisher relation
• The dynamics of three nearby E0 galaxies in refracted gravity
• Imprint of the galactic acceleration scale on globular cluster systems
• Gas expulsion in MOND: the possible origin of diffuse globular clusters and ultra-faint dwarf galaxies
• The kinematics of star clusters undergoing gas expulsion in Newtonian and Milgromian dynamics
• MONDian predictions for Newtonian M/L ratios for ultrafaint dSphs
• Formation of collisional ring galaxies in Milgromian dynamics
• Non-vacuum relativistic extensions of MOND using metric theories of gravity with curvature-matter couplings and their applications to the accelerated expansion of the Universe without dark components
• Refracted Gravity Solutions from Small to Large Scales
• Central MONDian spike in spherically symmetric systems
• Examining Baryonic Faber-Jackson Relation in Galaxy Groups