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The dangers of deprojection of proper motions

Abstract:
We re-examine the method of deprojection of proper motions, which has been used for finding the velocity ellipsoid of stars in the nearby Galaxy. This method is only legitimate if the lines of sight to the individual stars are uncorrelated with the stars' velocities. Very simple models are used to show that spurious results similar to ones recently reported are obtained when velocity dispersion decreases with galactocentric radius in the expected way. A scheme that compensates for this bias is proposed.
Publication status:
Published

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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics
More by this author
Institution:
University of Oxford
Department:
Oxford, MPLS, Physics, Theoretical Physics
Journal:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume:
400
Issue:
1
Pages:
L103-L106
Publication date:
2009-09-09
DOI:
EISSN:
1745-3933
ISSN:
0035-8711
URN:
uuid:2721628c-6c8b-42aa-8f2d-f54e9929ba93
Source identifiers:
11103
Local pid:
pubs:11103
Language:
English
Keywords:

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