Extended HI Rotation Curve and Mass Distribution of M31
Claude Carignan, Laurent Chemin, Walter K. Huchtmeier, Felix J. Lockman
Abstract
New HI observations of Messier 31 (M31) obtained with the Effelsberg and Green Bank 100-m telescopes make it possible to measure the rotation curve of that galaxy out to ~35 kpc. Between 20 and 35 kpc, the rotation curve is nearly flat at a velocity of ~226 km/s. A model of the mass distribution shows that at the last observed velocity point, the minimum dark-to-luminous mass ratio is \~0.5 for a total mass of 3.4 1011 Msol at R < 35 kpc. This can be compared to the estimated MW mass of 4.9 1011 Msol for R < 50 kpc.
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