Speaker
Description
While Modified Newtonian Dynamics (MOND) successfully accounts for the observed dynamics of individual galaxies without invoking dark matter, galaxy clusters still require additional mass beyond the observed baryonic buget even in this framework.
I will present recent results on five galaxy clusters from the XCOP survey (A1795, A2029, A2142, A644, A2319) using X-ray data under the assumptions of hydrostatic equilibrium and spherical symmetry to try to investigate the nature of this residual missing mass.
The results obtained are broadly consistent with what shown in recent papers, corroborating the "dark mass follow gas" hypothesis, suggesting that the missing mass in galaxy clusters within MOND may be of baryonic origin, possibly in the form of cold gas clouds. Future work will focus on the outskirts of the clusters, where the influence of the large-scale cosmic environment may become non-negligible, due to the External Field Effect and/or the loss of hydrostatic equilibrium.
| Parallel session | Astrophysical Probes of Dark Matter and Dark Energy |
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