Volume 462, Number 1, January IV 2007
|Page(s)||101 - 106|
|Published online||02 November 2006|
The proper motion of the Local Group galaxy IC 10
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: email@example.com
2 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
3 ASTRON, Postbus 2, 7990 AA Dwingeloo, The Netherlands
4 Department of Astrophysics, Radboud Universiteit Nijmegen, Postbus 9010, 6500 GL Nijmegen, The Netherlands
Accepted: 25 October 2006
We have measured the proper motion of the Local Group galaxy IC 10 with the Very Long Baseline Array by measuring the position of an H2O maser relative to two background quasars over 4.3 years. After correction for the rotation of the Milky Way and IC 10, we obtain a motion of – μas yr-1 toward the East and μas yr-1 toward the North. This corresponds to a total space velocity of km s-1 relative to the Milky Way for an assumed distance of kpc. Assuming that IC 10 and M 33, for which also a proper motion measurement exists, are bound to M 31, we calculate a lower limit for the mass of M 31 of .
Key words: astrometry / galaxies: Local Group / galaxies: individual: IC 10 / galaxies: kinematics and dynamics
© ESO, 2007
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