The wedding of modified dynamics and non-exotic dark matter in galaxy clusters

B. Famaey; G. W. Angus; G. Gentile; H. Y. Shan; H. S. Zhao

The wedding of modified dynamics and non-exotic dark matter in galaxy clusters

B. Famaey, G. W. Angus, G. Gentile, H. Y. Shan, H. S. Zhao

Physics & Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

4 Citations (Scopus)

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
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	Australia
City	Sydney, NSW
Period	9/24/07 → 9/28/07

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics

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title = "The wedding of modified dynamics and non-exotic dark matter in galaxy clusters",

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.",

author = "B. Famaey and Angus, {G. W.} and G. Gentile and Shan, {H. Y.} and Zhao, {H. S.}",

year = "2008",

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pages = "393--401",

booktitle = "Proceedings of the 6th International Heidelberg Conference on Dark Matter in Astroparticle and Particle Physics, Dark 2007",

note = "6th International Heidelberg Conference on Dark Matter in Astro and Particle Physics, Dark 2007 ; Conference date: 24-09-2007 Through 28-09-2007",

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Famaey, B, Angus, GW, Gentile, G, Shan, HY & Zhao, HS 2008, The wedding of modified dynamics and non-exotic dark matter in galaxy clusters. in Proceedings of the 6th International Heidelberg Conference on Dark Matter in Astroparticle and Particle Physics, Dark 2007. pp. 393-401, 6th International Heidelberg Conference on Dark Matter in Astro and Particle Physics, Dark 2007, Sydney, NSW, Australia, 9/24/07.

The wedding of modified dynamics and non-exotic dark matter in galaxy clusters. / Famaey, B.; Angus, G. W.; Gentile, G.; Shan, H. Y.; Zhao, H. S.

Proceedings of the 6th International Heidelberg Conference on Dark Matter in Astroparticle and Particle Physics, Dark 2007. 2008. p. 393-401.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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