The Extended H i Rotation Curve and Mass Distribution of M31
2006; IOP Publishing; Volume: 641; Issue: 2 Linguagem: Inglês
10.1086/503869
ISSN1538-4357
AutoresC. Carignan, L. Chemin, W. K. Huchtmeier, Felix J. Lockman,
Tópico(s)Astronomy and Astrophysical Research
ResumoNew H I 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-1. 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 M☉ at R < 35 kpc. This can be compared to the estimated Milky Way mass of 4.9 × 1011 M☉ for R < 50 kpc.
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