The Extended H I Rotation Curve and Mass Distribution of M31

New 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 635 kpc. Between 20 and 35 kpc, the rotation curve is nearly flat at a velocity of 6226 km s super(-1). A model of the mass distr...

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Veröffentlicht in:	Astrophysical journal. Letters 2006-04, Vol.641 (2), p.L109-L112
Hauptverfasser:	Carignan, Claude, Chemin, Laurent, Huchtmeier, Walter K, Lockman, Felix J
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomy Astrophysics Earth, ocean, space Exact sciences and technology Physics
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Zusammenfassung:	New 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 635 kpc. Between 20 and 35 kpc, the rotation curve is nearly flat at a velocity of 6226 km s super(-1). A model of the mass distribution shows that at the last observed velocity point, the minimum dark-to-luminous mass ratio is 60.5 for a total mass of 3.4 x 10 super(11) M sub(z) at R < 35 kpc. This can be compared to the estimated Milky Way mass of 4.9 x 10 super(11) M sub(z) for R < 50 kpc.
ISSN:	1538-4357 0004-637X 2041-8205 1538-4357 2041-8213
DOI:	10.1086/503869