Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560702b&link_type=abstract
American Astronomical Society, AAS Meeting #215, #607.02; Bulletin of the American Astronomical Society, Vol. 36, p.1139
Astronomy and Astrophysics
Astronomy
Scientific paper
We re-analyze the implications of a sample of 18 Galactic masers with precisely measured six-dimensional phase-space coordinates for the structure and dynamics of the Galaxy. We find that it is necessary to model the distribution function of the masers with a mean velocity offset as well as a general velocity dispersion tensor relative to their local standards of rest. In this model the maser data provide a weak constraint on the circular velocity at the Sun of V_c = 246 +/- 30 km/s. We do not confirm the value of V_c = 254 km/s found in more restrictive models. A combined estimate from recent work is V_c = 236 +/- 11 km/s. Apart from the dynamical parameters, we find that the masers tend to occur at post-apocenter, circular-velocity-lagging phases of their orbits.
Research partially supported by NASA (grant NNX08AJ48G), New York University's Horizon fellowship, and the Alexander von Humboldt Foundation of Germany.
Bovy Jo
Hogg David Wardell
Rix Herbert
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