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-1 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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- May 2022
- DOI:
- 10.1093/mnras/stac564
- arXiv:
- arXiv:2202.13766
- Bibcode:
- 2022MNRAS.512..544S
- Keywords:
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- gravitation;
- galaxies: general;
- galaxies: kinematics and dynamics;
- dark matter;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- Accepted for publication on MNRAS. arXiv admin note: substantial text overlap with arXiv:2110.06936