Published in
Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 4(346), p. L62-L66
DOI: 10.1111/j.1365-2966.2003.07367.x
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Tracing the Star Stream Through M31 Using Planetary Nebula Kinematics
,
M. R. Merrifield ,
Romanowsky Aj,
A. J. Romanowsky,
N. G. Douglas,
N. R. Napolitano,
M. Arnaboldi,
M. Capaccioli,
K. C. Freeman,
O. E. Gerhard,
N. W. Evans,
M. I. Wilkinson,
C. Halliday,
T. J. Bridges
and other authors.
Full text: Download
Abstract
We present a possible orbit for the Southern Stream of stars in M31, which connects it to the Northern Spur. Support for this model comes from the dynamics of planetary nebulae (PNe) in the disk of M31: analysis of a new sample of 2611 PNe obtained using the Planetary Nebula Spectrograph reveals ~20 objects whose kinematics are inconsistent with the normal components of the galaxy, but which lie at the right positions and velocities to connect the two photometric features via this orbit. The satellite galaxy M32 is coincident with the stream both in position and velocity, adding weight to the hypothesis that the stream comprises its tidal debris.