Extending the HI rotation curve of Messier 31

Details Extending the HI rotation curve of Messier 31 Extending the HI rotation curve of Messier 31

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..615c&link_type=abstract

SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli

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Scientific paper

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&sun;, 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.

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