The extended HI rotation curve and mass distribution of M31

被引：110

作者：

Carignan, C

Chemin, L

Huchtmeier, WK

Lockman, FJ

机构：

[1] Univ Montreal, Observ Mont Megant, Expt Astrophys Lab, Montreal, PQ H3C 3J7, Canada

[2] Univ Montreal, Dept Phys, Montreal, PQ H3C 3J7, Canada

[3] Univ Paris, Sect Meudon, GEPI, CNRS,UMR 8111, F-92195 Meudon, France

[4] Univ Paris 07, F-92195 Meudon, France

[5] Max Planck Inst Radioastron, D-53121 Bonn, Germany

来源：

ASTROPHYSICAL JOURNAL | 2006年 / 641卷 / 02期

关键词：

galaxies : fundamental parameters (masses); galaxies : halos; galaxies : individual (M31); galaxies : kinematics and dynamics; galaxies : structure; Local Group;

D O I：

10.1086/503869

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 similar to 35 kpc. Between 20 and 35 kpc, the rotation curve is nearly flat at a velocity of similar to 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 similar to 0.5 for a total mass of 3.4 x 10(11) M-circle dot at R < 35 kpc. This can be compared to the estimated Milky Way mass of 4.9 x 10(11) M-circle dot for R < 50 kpc.

引用

页码：L109 / L112

页数：4

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