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dc.contributor.authorMüller, Oliver
dc.contributor.authorFamaey, Benoit
dc.contributor.authorZhao, Hongsheng
dc.identifier.citationMüller , O , Famaey , B & Zhao , H 2019 , ' Predicted MOND velocity dispersions for a catalog of ultra-diffuse galaxies in group environments ' , Astronomy & Astrophysics , vol. 623 , A36 .
dc.identifier.otherPURE: 258223757
dc.identifier.otherPURE UUID: 4c49ec14-6907-45f7-a41e-d90a43a2319a
dc.identifier.othercrossref: 10.1051/0004-6361/201834914
dc.identifier.otherScopus: 85062799917
dc.identifier.otherWOS: 000459848100001
dc.descriptionO.M. thanks the Swiss National Science Foundation for financial support.en
dc.description.abstractThe possibility that ultra-diffuse galaxies are 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 have constructed 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.
dc.relation.ispartofAstronomy & Astrophysicsen
dc.rightsCopyright © O. Müller et al. 2019. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.en
dc.subjectGalaxies: kinematics and dynamicsen
dc.subjectGalaxies: dwarfen
dc.subjectCosmology: theoryen
dc.subjectQB Astronomyen
dc.titlePredicted MOND velocity dispersions for a catalog of ultra-diffuse galaxies in group environmentsen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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