Extended HI Rotation Curve and Mass Distribution of M31

Preprint

6 March 2006

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.astro-ph/0603143

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.

Keywords

MASS DISTRIBUTION
ROTATION CURVE
M31 NEW
MW MASS
MESSIER
GALAXY
MSOL
KPC

All Related Versions

Version 1, 2006-03-06, ArXiv
Published version: The Astrophysical Journal, 641 (2), L109.

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