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

Journal article

Authors/Editors

Angus, Garry

Research Areas

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Publication Details

Author list: Gentile G, Angus GW, Famaey B, Oh SH, de Blok WJG

Publisher: EDP Sciences

Place: LES ULIS CEDEX A

Publication year: 2012

Journal: Astronomy & Astrophysics (0004-6361)

Journal acronym: ASTRON ASTROPHYS

Volume number: 543

Number of pages: 5

ISSN: 0004-6361

eISSN: 1432-0746

Languages: English-Great Britain (EN-GB)

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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.

Keywords

Dark matter, galaxies: dwarf, galaxies: kinematics and dynamics, gravitation

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