Dwarf Spheroidals in MOND

Abstract

We take the line of sight velocity dispersions as functions of radius for 8 Milky Way dwarf spheroidal galaxies and use Jeans analysis to calculate the mass-to-light ratios (M/L) in Modified Newtonian Dynamics (MOND). Using the latest structural parameters, distances and variable velocity anisotropy, we find 6/8 dwarfs have sensible M/L using only the stellar populations. Sextans and Draco, however, have M/L=9.2_{-3.0}^{+5.3} and 43.9_{-19.3}^{+29.0} respectively, which poses a problem. Apart from the need for Sextans' integrated magnitude to be reviewed, we propose tidal effects intrinsic to MOND, testable with numerical simulations, but fully orbit dependant, which are disrupting Draco. The creation of the Magellanic Stream is also re-addressed in MOND, the scenario being the stream is ram pressure stripped from the SMC as it crosses the LMC.

9 pages, 3 figures, 1 table. Accepted for publication in MNRAS

References in corpus (52)

• Dark Matter Substructure in Galactic Halos
• Dwarf Galaxies of the Local Group
• Relativistic gravitation theory for the MOND paradigm
• The Baryonic Tully-Fisher Relation
• Modified Newtonian Dynamics as an Alternative to Dark Matter
• The Baryonic Tully-Fisher Relation of Galaxies with Extended Rotation Curves and the Stellar Mass of Rotating Galaxies
• The Observed properties of Dark Matter on small spatial scales
• The Present and Future Mass of the Milky Way Halo
• Modified Newtonian Dynamics in the Milky Way
• The Proper Motion of the Large Magellanic Cloud using HST
• Velocity Dispersion Profiles of Seven Dwarf Spheroidal Galaxies
• A New Look at the Kinematics of Neutral Hydrogen in the Small Magellanic Cloud
• Is the SMC Bound to the LMC? The HST Proper Motion of the SMC
• The Mass Discrepancy-Acceleration Relation: Disk Mass and the Dark Matter Distribution
• The Millennium Galaxy Catalogue: the B-band attenuation of bulge and disc light and the implied cosmic dust and stellar mass densities
• The Velocity Dispersion Profile of the Remote Dwarf Spheroidal Galaxy Leo I: A Tidal Hit and Run?
• A Dynamical Fossil in the Ursa Minor Dwarf Spheroidal Galaxy
• Exploring Halo Substructure with Giant Stars XI: The Tidal Tails of the Carina Dwarf Spheroidal and the Discovery of Magellanic Cloud Stars in the Carina Foreground
• On the Proof of Dark Matter, the Law of Gravity and the Mass of Neutrinos
• Ram pressure stripping of disc galaxies orbiting in clusters. I. Mass and radius of the remaining gas disc
• Missing Mass in Collisional Debris from Galaxies
• The Draco and Ursa Minor dwarf spheroidals. A comparative study
• Tidal dwarf galaxies as a test of fundamental physics
• Kinematic Disturbances in Optical Rotation Curves among 89 Virgo Disk Galaxies
• Exploring Halo Substructure with Giant Stars X. Extended Dark Matter or Tidal Disruption?: The Case for the Leo I Dwarf Spheroidal Galaxy
• The modified Newtonian dynamics-MOND-and its implications for new physics
• Exploring Halo Substructure with Giant Stars: The Velocity Dispersion Profiles of the Ursa Minor and Draco Dwarf Spheroidals At Large Angular Separations
• Exploring Halo Substructure with Giant Stars IV: The Extended Structure of the Ursa Minor Dwarf Spheroidal
• New insights on the Draco dwarf spheroidal galaxy from SDSS: a larger radius and no tidal tails
• Stellar kinematics in the remote Leo II dwarf spheroidal galaxy -- Another brick in the wall
• Modeling The Structure And Dynamics of Dwarf Spheroidal Galaxies with Dark Matter And Tides
• Mass modelling of dwarf spheroidal galaxies: the effect of unbound stars from tidal tails and the Milky Way
• Proper Motions of Dwarf Spheroidal Galaxies from Hubble Space Telescope Imaging. III: Measurement for Ursa Minor
• Milky Way potentials in CDM and MOND. Is the Large Magellanic Cloud on a bound orbit?
• Dwarf-spheroidal satellites: are they of tidal origin?
• A photometrically and kinematically distinct core in the Sextans dwarf spheroidal galaxy
• The Red Giant Branch Tip and Bump of the Leo II dwarf spheroidal galaxy
• MOND and the seven dwarfs
• On the growth of structure in theories with a dynamical preferred frame
• Dwarf satellite galaxies in the modified dynamics
• The distance to the Leo I dwarf spheroidal galaxy from the Red Giant Branch Tip
• Two-body relaxation in modified Newtonian dynamics
• Galaxy merging in MOND
• Loss of mass and stability of galaxies in MOND
• Draco, a flawless dwarf galaxy
• MOND and the mass discrepancies in tidal dwarf galaxies
• The collision velocity of the bullet cluster in conventional and modified dynamics
• Observed Properties of Dark Matter: dynamical studies of dSph galaxies
• Velocity dispersions of dwarf spheroidal galaxies: dark matter versus MOND
• Tidal radii and escape speeds in dwarf spheroidal galaxies under MOND and dark halos compared
• The velocity distribution of SDSS satellites in MOND
• Environmental effects on the structure of the Dwarf Spheroidal Galaxies

Cited by in corpus (84)

• Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
• A galaxy lacking dark matter
• The VPOS: a vast polar structure of satellite galaxies, globular clusters and streams around the Milky Way
• Quasi-linear formulation of MOND
• Theory of Dark Matter Superfluidity
• Dark matter heats up in dwarf galaxies
• A new relativistic theory for Modified Newtonian Dynamics
• Local-Group tests of dark-matter Concordance Cosmology: Towards a new paradigm for structure formation
• Dwarf Galaxy Planes: the discovery of symmetric structures in the Local Group
• The rotationally stabilized VPOS and predicted proper motions of the Milky Way satellite galaxies
• Dwarf spheroidal galaxy kinematics and spiral galaxy scaling laws
• From galactic bars to the Hubble tension: weighing up the astrophysical evidence for Milgromian gravity
• Local Group Dwarf Spheroidals: Correlated Deviations from the Baryonic Tully-Fisher Relation
• A Tale of Two Paradigms: the Mutual Incommensurability of LCDM and MOND
• Are sterile neutrinos consistent with clusters, the CMB and MOND?
• Andromeda Dwarfs in Light of MOND. II. Testing Prior Predictions
• Dark Matter Superfluidity and Galactic Dynamics
• MOND effects in the inner solar system
• An Alternative to Particle Dark Matter
• Dark matters on the scale of galaxies
• Declining rotation curves of galaxies as a test of gravitational theory
• Andromeda Dwarfs in Light of MOND
• Wide binaries as a critical test of Classical Gravity
• MOND simulation suggests the origin of some peculiarities in the Local Group
• 3D motions in the Sculptor dwarf galaxy as a glimpse of a new era
• The central surface density of "dark halos" predicted by MOND
• Testing the MOND Paradigm of Modified Dynamics with Galaxy-Galaxy Gravitational Lensing
• Phenomenological consequences of superfluid dark matter with baryon-phonon coupling
• MOND vs. dark matter in light of historical parallels
• The abundance of galaxy clusters in MOND: Cosmological simulations with massive neutrinos
• Equilibrium configurations of 11eV sterile neutrinos in MONDian galaxy clusters
• Another Path for the Emergence of Modified Galactic Dynamics from Dark Matter Superfluidity
• Stellar streams as gravitational experiments II. Asymmetric tails of globular cluster streams
• MOND Prediction for the Velocity Dispersion of the `Feeble Giant' Crater II
• Testing fundamental physics with distant star clusters: theoretical models for pressure-supported stellar systems
• The outskirts of globular clusters as modified gravity probes
• The MOND Fundamental Plane
• A QUMOND galactic N-body code I: Poisson solver and rotation curve fitting
• A historical perspective on Modified Newtonian Dynamics
• Resolving the timing problem of the globular clusters orbiting the Fornax dwarf galaxy
• The Third Law of Galactic Rotation
• Using dwarf satellite proper motions to determine their origin
• Reconciling MOND and dark matter?
• A Realistic Cosmology Without Cold Dark Matter
• A natural approach to extended Newtonian gravity: tests and predictions across astrophysical scales
• Understanding local Dwarf Spheroidals and their scaling relations under MOdified Newtonian Dynamics
• Implications for dwarf spheroidal mass content from interloper removal
• Globular clusters in modified Newtonian dynamics: velocity-dispersion profiles from self-consistent models
• Flattened velocity dispersion profiles in Globular Clusters: Newtonian tides or modified gravity?
• An extensive catalogue of early-type galaxies in the nearby Universe
• A census of the expected properties of classical Milky Way dwarfs in Milgromian dynamics
• MOND and IMF variations in early-type galaxies from $ATLA{S}^{3D}$
• Verlinde's emergent gravity versus MOND and the case of dwarf spheroidals
• N-body simulations of the Carina dSph in MOND
• The mass discrepancy acceleration relation in early-type galaxies: extended mass profiles and the phantom menace to MOND
• Radial-orbit instability in modified Newtonian dynamics
• Distant star clusters of the Milky Way in MOND
• Sextans' cold substructures as a dynamical judge: Core, Cusp or MOND?
• Testing Verlinde's emergent gravity in early-type galaxies
• The Curious Case of Palomar 13: The Influence of the Orbital Phase on the Appearance of Galactic Satellites
• Study of gravitational fields and globular cluster systems of early-type galaxies
• The cusp-core problem in gas-poor dwarf spheroidal galaxies
• Dark Matter and IMF normalization in Virgo dwarf early-type galaxies
• N-body simulations for testing the stability of triaxial galaxies in MOND
• Substructure lensing in galaxy clusters as a constraint on low-mass sterile neutrinos in tensor-vector-scalar theory: The straight arc of Abell 2390
• Testing modified gravity with dwarf spheroidal galaxies
• A lower limit on the dark particle mass from dSphs
• Lopsidedness of self-consistent galaxies by the external field effect of clusters
• On the separation between baryonic and dark matter: evidence for phantom dark matter?
• Dwarf Galaxies, MOND, and Relativistic Gravitation
• The MOND External Field Effect on the Dynamics of the Globular Clusters: General Considerations and Application to NGC 2419
• The survival of dynamical fossils in dwarf spheroidal galaxies in conventional and modified dynamics
• Low-surface-brightness spheroidal galaxies as Milgromian isothermal spheres
• Low-acceleration dwarf galaxies as tests of quantised inertia
• Probabilistic distributions of $M/L$ values for ultra-faint dwarf spheroidal galaxies: stochastic samplings of the IMF
• Constraining MOND Using the Vertical Motion of Stars in the Solar Neighborhood
• Gravitational anomalies signaling the breakdown of classical gravity
• Tully-Fisher relation, key to dark matter companion of baryonic matter
• Distribution of Phantom Dark Matter in Dwarf Spheroidals
• The p-Laplacian as a Framework for Generalizing Newtonian Gravity and MoND
• Dark matter and alternative recipes for the missing mass
• Dynamics of Dwarf Galaxies in Scalar-Tensor-Vector-Gravity
• Measuring Mass of Gas in Central Galaxies using weak lensing and satellite kinematics in MOND
• The Escape of Globular Clusters from the Satellite Dwarf Galaxies of the Milky Way