Galaxy merging in MOND

Details Galaxy merging in MOND Galaxy merging in MOND

2007-05-31

arxiv.org/abs/0705.4633v2

Astronomy and Astrophysics

Astrophysics

5 pages, 2 color figures. To appear in MNRAS Letters. Added references and discussion, conclusions unchanged

Scientific paper

10.1111/j.1745-3933.2007.00378.x

We present the results of N-body simulations of dissipationless galaxy merging in Modified Newtonian Dynamics (MOND). For comparison, we also studied Newtonian merging between galaxies embedded in dark matter halos, with internal dynamics equivalent to the MOND systems. We found that the merging timescales are significantly longer in MOND than in Newtonian gravity with dark matter, suggesting that observational evidence of rapid merging could be difficult to explain in MOND. However, when two galaxies eventually merge, the MOND merging end-product is hardly distinguishable from the final stellar distribution of an equivalent Newtonian merger with dark matter.

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