Modified Newtonian Dymanics and the Coma Cluster
Abstract
We check the consistency of Milgrom's theory of Modified Newtonian Dynamics against optical and x-ray data for the Coma cluster of galaxies. We find that viable models for the cluster containing no dark matter can be constructed. They require an extensive gaseous atmosphere through which galaxies move on near-radial orbits. The gas temperature is predicted to have a shallow minimum near the cluster center; this structure may confiict with the best x-ray spectra of the cluster. In addition, the models require values for Milgrom's "universal" parameter a_0_ that are >~ 2h^1.5^_50_ times larger than those that give good fits to spiral rotation curves. This discrepancy appears significant and may be a serious problem for the theory.
- Publication:
-
The Astronomical Journal
- Pub Date:
- June 1988
- DOI:
- 10.1086/114760
- Bibcode:
- 1988AJ.....95.1642T
- Keywords:
-
- Astrodynamics;
- Dark Matter;
- Galactic Clusters;
- Gas Temperature;
- Stellar Atmospheres;
- X Ray Spectroscopy;
- Computational Astrophysics;
- Galactic Nuclei;
- Intergalactic Media;
- Astrophysics;
- GRAVITATION;
- GALAXIES: CLUSTERING