Isolated and non-isolated dwarfs in terms of modified Newtonian dynamics

Abstract

Within the framework of modified Newtonian dynamics (MOND) we investigate the kinematics of two dwarf spiral galaxies belonging to very different environments, namely KK 246 in the Local Void and Holmberg II in the M81 group. A mass model of the rotation curve of KK 246 is presented for the first time, and we show that its observed kinematics are consistent with MOND. We re-derive the outer rotation curve of Holmberg II, by modelling its HI data cube, and find that its inclination should be closer to face-on than previously derived. This implies that Holmberg II has a higher rotation velocity in its outer parts, which, although not very precisely constrained, is consistent with the MOND prediction.

Accepted in A&A as a Research Note. 6 pages, 3 figures

References in corpus (3)

• High-resolution dark matter density profiles of THINGS dwarf galaxies: Correcting for non-circular motions
• THINGS about MOND
• Deep Near-IR Surface Photometry of 57 Galaxies in the Local Sphere of Influence

Cited by in corpus (9)

• Galaxies as simple dynamical systems: observational data disfavor dark matter and stochastic star formation
• The universal rotation curve of dwarf disk galaxies
• From galactic bars to the Hubble tension: weighing up the astrophysical evidence for Milgromian gravity
• Missing dark matter in dwarf galaxies?
• Evolution of dwarf galaxies: a dynamical perspective
• Predicted MOND velocity dispersions for a catalog of ultra-diffuse galaxies in group environments
• Low-Density Structures in the Local Universe. II. Nearby Cosmic Voids
• A Deep, Wide-Field Study of Holmberg II with Suprime-Cam: Evidence for Ram Pressure Stripping
• Slowly rotating gas-rich galaxies in modified Newtonian dynamics (MOND)