The Extended H i Rotation Curve and Mass Distribution of M31 | Zendy

C. Carignan | Zendy; L. Chemin | Zendy; W. K. Huchtmeier | Zendy; Felix J. Lockman | Zendy

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The Extended H i Rotation Curve and Mass Distribution of M31

Author(s) -

C. Carignan,

L. Chemin,

W. K. Huchtmeier,

Felix J. Lockman

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/503869

Subject(s) - galaxy rotation curve , mass distribution , physics , galaxy , astrophysics , mass ratio , rotation (mathematics) , light curve , astronomy , geometry , galaxy formation and evolution , mathematics

New HI observations of Messier 31 (M31) obtained with the Effelsberg andGreen Bank 100-m telescopes make it possible to measure the rotation curve ofthat galaxy out to ~35 kpc. Between 20 and 35 kpc, the rotation curve is nearlyflat at a velocity of ~226 km/s. A model of the mass distribution shows that atthe 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 tothe estimated MW mass of 4.9 10^11 Msol for R < 50 kpc.Comment: 4 pages, 2 figures, accepted for publication in ApJ Letter

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