The Proper Motion of the Local Group Galaxy IC 10

Abstract

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 -39 +/- 9 microas/yr toward the East and 31 +/- 8 microas/yr toward the North. This corresponds to a total space velocity of 215 +/- 42 km/s relative to the Milky Way for an assumed distance of 660 +/- 66 kpc. Assuming that IC 10 and M33, for which also a proper motion measurement exists, are bound to M31, we calculate a lower limit for the mass of M31 of 7.5 x 10^11 Msol.

Astronomy & Astrophysics, accepted, 7 pages, 6 figures, also available at http://www.mpifr-bonn.mpg.de/staff/abrunthaler/pub.shtml

References in corpus (3)

• Is the SMC Bound to the LMC? The HST Proper Motion of the SMC
• Water maser motions in W3(OH) and a determination of its distance
• Water masers in the Local Group of galaxies

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