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Galactic rotation curve from the space velocities of selected masers

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Abstract

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 ⊙)LSR depend significantly on the Sun’s phase in the spiral wave.

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Authors and Affiliations

  1. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. 65, St. Petersburg, 196140, Russia

    A. S. Stepanishchev & V. V. Bobylev

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  1. A. S. Stepanishchev
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  2. V. V. Bobylev
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Correspondence to A. S. Stepanishchev.

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Original Russian Text © A.S. Stepanishchev, V.V. Bobylev, 2011, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2011, Vol. 37, No. 4, pp. 281–293.

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Stepanishchev, A.S., Bobylev, V.V. Galactic rotation curve from the space velocities of selected masers. Astron. Lett. 37, 254–266 (2011). https://doi.org/10.1134/S1063773711030054

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