Predicted MOND velocity dispersions for a catalog of ultra-diffuse galaxies in group environments. (arXiv:1901.02679v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Muller_O/0/1/0/all/0/1">Oliver Müller</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Famaey_B/0/1/0/all/0/1">Benoit Famaey</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhao_H/0/1/0/all/0/1">Hongsheng Zhao</a>
The possibility that ultra-diffuse galaxies lacking dark matter has recently
stimulated interest to check the validity of Modified Newton Dynamics (MOND)
predictions on the scale of such galaxies. It has been shown that the External
Field Effect (EFE) induced by the close-by galaxy can suppress the velocity
dispersion of these systems, so that they appear almost dark matter free in the
Newtonian context. Here, following up on this, we are making a priori
predictions for the velocity dispersion of 22 ultra-diffuse galaxies in the
nearby Universe. This sample can be used to test MOND and the EFE with future
follow-up measurements. We construct a catalog of nearby ultra-diffuse galaxies
in galaxy group environments, and set upper and lower limits for the possible
velocity dispersion allowed in MOND, taking into account possible variations in
the mass-to-light ratio of the dwarf and in the distance to the galaxy group.
The prediction for the velocity dispersion is made as a function of the three
dimensional separation of the dwarf to its host. In 17 out of 22 cases, the EFE
plays a crucial role in the prediction.
The possibility that ultra-diffuse galaxies lacking dark matter has recently
stimulated interest to check the validity of Modified Newton Dynamics (MOND)
predictions on the scale of such galaxies. It has been shown that the External
Field Effect (EFE) induced by the close-by galaxy can suppress the velocity
dispersion of these systems, so that they appear almost dark matter free in the
Newtonian context. Here, following up on this, we are making a priori
predictions for the velocity dispersion of 22 ultra-diffuse galaxies in the
nearby Universe. This sample can be used to test MOND and the EFE with future
follow-up measurements. We construct a catalog of nearby ultra-diffuse galaxies
in galaxy group environments, and set upper and lower limits for the possible
velocity dispersion allowed in MOND, taking into account possible variations in
the mass-to-light ratio of the dwarf and in the distance to the galaxy group.
The prediction for the velocity dispersion is made as a function of the three
dimensional separation of the dwarf to its host. In 17 out of 22 cases, the EFE
plays a crucial role in the prediction.
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