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arXiv · astro-ph/0603143

Extended HI Rotation Curve and Mass Distribution of M31

Claude Carignan·Laurent Chemin·Walter K. Huchtmeier·Felix J. Lockman
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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 10^11 Msol at R < 35 kpc. This can be compared to the estimated MW mass of 4.9 10^11 Msol for R < 50 kpc.

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Claude Carignan, Laurent Chemin, Walter K. Huchtmeier, Felix J. Lockman. 2006-03-06. Extended HI Rotation Curve and Mass Distribution of M31. https://doi.org/10.1086/503869

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