The mass discrepancy acceleration relation in early-type galaxies: extended mass profiles and the phantom menace to MOND

Abstract

The dark matter (DM) haloes around spiral galaxies appear to conspire with their baryonic content: empirically, significant amounts of DM are inferred only below a universal characteristic acceleration scale. Moreover, the discrepancy between the baryonic and dynamical mass, which is usually interpreted as the presence of DM, follows a very tight mass discrepancy acceleration (MDA) relation. Its universality, and its tightness in spiral galaxies, poses a challenge for the DM interpretation and was used to argue in favour of MOdified Newtonian Dynamics (MOND). Here, we test whether or not this applies to early-type galaxies. We use the dynamical models of fast-rotator early-type galaxies by Cappellari et al. based on ATLAS${}^{3D}$ and SLUGGS data, which was the first homogenous study of this kind, reaching ~4 $R_e$, where DM begins to dominate the total mass budget. We find the early-type galaxies to follow an MDA relation similar to spiral galaxies, but systematically offset. Also, while the slopes of the mass density profiles inferred from galaxy dynamics show consistency with those expected from their stellar content assuming MOND, some profiles of individual galaxies show discrepancies.

7 pages, 3 figures, accepted for publication in MNRAS

References in corpus (19)

• A systematic variation of the stellar initial mass function in early-type galaxies
• Measuring the inclination and mass-to-light ratio of axisymmetric galaxies via anisotropic Jeans models of stellar kinematics
• Galaxies as simple dynamical systems: observational data disfavor dark matter and stochastic star formation
• The SAGES Legacy Unifying Globulars and GalaxieS Survey (SLUGGS): Sample definition, methods, and initial results
• Confrontation of MOND with the rotation curves of early-type disc galaxies
• Insight into the baryon-gravity relation in galaxies
• Velocity dispersion around ellipticals in MOND
• X-ray Group and cluster mass profiles in MOND: Unexplained mass on the group scale
• The shape of the dark matter halo in the early-type galaxy NGC 2974
• Small scatter and nearly-isothermal mass profiles to four half-light radii from two-dimensional stellar dynamics of early-type galaxies
• Dwarf Spheroidals in MOND
• The SAURON Project - XIV. No escape from V${}_{\mathrm{esc}}$: a global and local parameter in early-type galaxy evolution
• Galactic rotation curves, the baryon-to-dark-halo-mass relation and space-time scale invariance
• Vertical dynamics of disk galaxies in MOND
• Testing MOND Over a Wide Acceleration Range in X-Ray Ellipticals
• Dynamical Models of Elliptical Galaxies in z=0.5 Clusters: II. Mass-to-Light Ratio Evolution without Fundamental Plane Assumptions
• Testing gravity with motion of satellites around galaxies: Newtonian gravity against Modified Newtonian Dynamics
• The Third Law of Galactic Rotation
• Mond - a review

Cited by in corpus (11)

• One Law To Rule Them All: The Radial Acceleration Relation of Galaxies
• A statistical investigation of the mass discrepancy-acceleration relation
• Systematic trends in total-mass profiles from dynamical models of early-type galaxies
• On the formation mechanisms of compact elliptical galaxies
• Understanding the internal dynamics of elliptical galaxies without non-baryonic dark matter
• Low-mass compact elliptical galaxies: spatially-resolved stellar populations and kinematics with the Keck Cosmic Web Imager
• Study of gravitational fields and globular cluster systems of early-type galaxies
• Dynamics of Elliptical Galaxies with Planetary Nebulae in Modified Newtonian Dynamics
• Halo Acceleration Relation
• Modeling Nearly Spherical Pure-Bulge Galaxies with a Stellar Mass-to-Light Ratio Gradient under the $\Lambda$CDM and MOND Paradigms: II. The Orbital Anisotropy of Slow Rotators within the Effective Radius
• Entropy and Mass Distribution in Disc Galaxies