On the Orbital Velocity of Isolated Galaxy Pairs: II Accurate MOND Predictions

Abstract

Examining a catalogue of isolated galaxy pairs, a preferred orbital intervelocity of ~150 km/s was recently reported. This discovery is difficult to reconcile with the expectations from Newtonian numerical simulations of cosmological structure formations. In a previous paper we have shown that a preferred intervelocity for galaxy pairs is expected in Modified Newtonian Dynamics (MOND). Here a detailed analysis of the MOND predictions is presented, showing that a remarkable agreement with the observations can be achieved for a mass to light ratio M/L~1 in solar units. This agrees with the expectations for a typical stellar population, without requiring non-baryonic dark matter for these systems.

Accepted for publication on MNRAS. arXiv admin note: substantial text overlap with arXiv:2110.06936

References in corpus (3)

• HyperLEDA. III. The catalogue of extragalactic distances
• Statistical deprojection of intervelocities, interdistances and masses in the Isolated Galaxy Pair Catalog
• On the Orbital Velocity of Isolated Galaxy Pairs: a test of gravity in the low acceleration regime

Cited by in corpus (4)

• From galactic bars to the Hubble tension: weighing up the astrophysical evidence for Milgromian gravity
• Dynamical friction in the quasi-linear formulation of modified Newtonian dynamics (QuMOND)
• The intervelocity of galaxy pairs in $\Lambda$CDM -- The observed velocity peak at ~130 km/s is not unique to MOND
• The modified Newtonian dynamics with an extra anti-dissipation term can yield the MOND model