Proper Motion of Milky Way Dwarf Spheroidals from Line-of-Sight Velocities

Details Proper Motion of Milky Way Dwarf Spheroidals from Line-of-Sight Velocities Proper Motion of Milky Way Dwarf Spheroidals from Line-of-Sight Velocities

2008-05-07

arxiv.org/abs/0805.0795v2

Astrophys.J. 682:L93-L96, 2008

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure. Minor changes to match published version

Scientific paper

10.1086/591052

Proper motions for several Milky Way dwarf spheroidal (dSph) galaxies have been determined using both ground and space-based imaging. These measurements require long baselines and repeat observations and typical errors are of order ten milli-arcseconds per century. In this paper, we utilize the effect of "perspective rotation" to show that systematic proper motion of some dSphs can be determined to a similar precision using only stellar line-of-sight velocities. We show that including the effects of small intrinsic rotation in dSphs increases the proper motion errors by about a factor of two. We provide error projections for future data sets, and show that proposed thirty meter class telescopes will measure the proper motion of a few dSphs with milli-arcsecond per century precision.

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