EAS Publications Series
Volume 20, 2006Mass Profiles and Shapes of Cosmological Structures
|Page(s)||271 - 272|
|Published online||19 May 2006|
G.A. Mamon, F. Combes, C. Deffayet and B. Fort (eds)
EAS Publications Series, 20 (2006) 271-272
Extending the HI rotation curve of Messier 31
Département de Physique and Observatoire du Mont Mégantic, Université de Montréal, CP 6128, Succ.
Centre-Ville, Montréal, Qc, Canada, H3C 3J7
2 Observatoire de Paris, Section Meudon, GEPI, CNRS-UMR 8111 & Université Paris 7, 5 Pl. Janssen, 92195 Meudon, France
3 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
New 21-cm observations of Messier 31 are used to measure its rotation curve up to a radius of ~40 kpc. The observations were obtained at the Effelsberg 100-m telescope and extend by ~15 kpc the radius of the last measured point of the rotation curve. A preliminary model of the mass distribution shows that at the last observed velocity point, the dark–to–luminous mass ratio is ~1 for a total mass of ~4.5 × 1011 M๏, which value is comparable with that of the Milky Way. This exploratory project is ongoing and other Hi observations using other radio-telescopes are planned to confirm this result, as well as a mosaic of the Hα emission line.
© EAS, EDP Sciences, 2006
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.