Isolated and non-isolated dwarfs in terms of modified Newtonian dynamics

Gentile, G; Angus, G W; Famaey, B; Oh, S-H; de Blok, W J G

Isolated and non-isolated dwarfs in terms of modified Newtonian dynamics

Journal Article

2012

Journal Title

Astronomy and Astrophysics

Link to Journal

https://dx.doi.org/10.1051/0004-6361/201218997

Department

Department of Astronomy

Faculty

Faculty of Science

Abstract

Within the framework of modified Newtonian dynamics (MOND), we investigate the kinematics of two dwarf spiral galaxies belonging to very different environments, namely KK 246 in the Local Void and Holmberg II in the M 81 group. A mass model of the rotation curve of KK 246 is presented for the first time, and we show that its observed kinematics are consistent with MOND. We re-derive the outer rotation curve of Holmberg II, by modelling its HI data cube, and find that its inclination should be closer to face-on than previously derived. This implies that Holmberg II has a higher rotation velocity in its outer parts, which, although not very precisely constrained, is consistent with the MOND prediction.