Galactic rotation curve from the space velocities of selected masers

Details Galactic rotation curve from the space velocities of selected masers Galactic rotation curve from the space velocities of selected masers

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011astl...37..254s&link_type=abstract

Astronomy Letters, Volume 37, Issue 4, pp.254-266

Astronomy and Astrophysics

Astronomy

1

Rotation Curve, Galactic Kinematics, Masers, Star-Forming Regions

Scientific paper

Based on currently available observations of 28 maser sources in 25 star-forming regions with measured trigonometric parallaxes, proper motions, and radial velocities, we have constructed the rotation curve of the Galaxy. Taking different distances to the Galactic center R 0, we have estimated the peculiar velocity of the Sun, the angular velocity of Galactic rotation, and its three derivatives. For R 0 = 8 kpc, we have found the circular velocity of the Sun to be V 0 = 243 ± 16 km s-1, which corresponds to a revolution period of 202 ± 10 Myr. We have obtained the Oort constants A = 16.9 ± 1.2 km s-1 kpc-1 and B = -13.5 ± 1.4 km s-1 kpc-1. Our simulation of the influence of a spiral density wave has shown that the peculiar velocity of the Sun with respect to the local standard of rest and the component ( V &sun;)LSR depend significantly on the Sun's phase in the spiral wave.

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