Abstract
We summarize the status of Modified Newtonian Dynamics (MOND) in galaxy clusters. The observed acceleration is typically larger than the acceleration threshold of MOND in the central regions, implying that some dark matter is necessary to explain the mass discrepancy there. A plausible resolution of this issue is that the unseen mass in MOND is in the form of ordinary neutrinos with masses just below the experimentally detectable limit. In particular, we show that the lensing mass reconstructions of the rich clusters 1E0657-56 (the bullet cluster) and Cl0024+17 (the ring) do not pose a new challenge to this scenario. However, the mass discrepancy for cool X-ray emitting groups in which neutrinos cannot cluster pose a more serious problem, meaning that dark baryons could present a more satisfactory solution to the problem of unseen mass in MOND clusters.
| Original language | English |
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| Title of host publication | Proceedings of the 6th International Heidelberg Conference on Dark Matter in Astroparticle and Particle Physics, Dark 2007 |
| Pages | 393-401 |
| Number of pages | 9 |
| Publication status | Published - 2008 |
| Event | 6th International Heidelberg Conference on Dark Matter in Astro and Particle Physics, Dark 2007 - Sydney, NSW, Australia Duration: Sep 24 2007 → Sep 28 2007 |
Other
| Other | 6th International Heidelberg Conference on Dark Matter in Astro and Particle Physics, Dark 2007 |
|---|---|
| Country/Territory | Australia |
| City | Sydney, NSW |
| Period | 9/24/07 → 9/28/07 |
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics