Autor:	McMillan, Paul J., Binney, James J.
Rok vydání:	2009
Předmět:	Astrophysics - Astrophysics of Galaxies Astrophysics - Instrumentation and Methods for Astrophysics
Druh dokumentu:	Working Paper
DOI:	10.1111/j.1745-3933.2009.00775.x
Popis:	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. Comment: 5 pages, 5 figures (3 colour), MNRAS submitted
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0909.1679 Zobrazit plný text záznamu View this record from Arxiv