On the Orbital Velocity of Isolated Galaxy Pairs: a test of gravity in the low acceleration regime

Abstract

The dynamics of isolated galaxy pairs represents an important tool to investigate the behavior of gravity in the low acceleration regime. Statistical analysis of a large sample of galaxy pairs led to the noticeable discovery of a region of preferred 3-dimensional velocities centered at $\sim 150$ km/s and $\sim 100$ km/s wide, a feature hard to justify in the context of numerical simulations of cosmological structure formation. It is shown here that such a feature is expected within the framework of the Modified Newtonian Dynamics, which, however, predicts it to be centered at $\sim$ 170 Km/s.

accepted for MNRAS

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Cited by in corpus (2)

• From galactic bars to the Hubble tension: weighing up the astrophysical evidence for Milgromian gravity
• On the Orbital Velocity of Isolated Galaxy Pairs: II Accurate MOND Predictions