Determination of Galactic Rotation Parameters and the Solar Galactocentric Distance R-0 from 73 Masers

作者：Bobylev V V^*; Bajkova A T

来源：Astronomy Letters, 2014, 40(7): 389-397.

DOI：10.1134/S1063773714070020

• kinematics
• masers
• rotation curve
• solar Galactocentric distance
• Galaxy (Milky Way)

We have determined the Galactic rotation parameters and the solar Galactocentric distance R-0 by simultaneously solving Bottlinger%26apos;s kinematic equations using data on masers with known line-of-sight velocities and highly accurate trigonometric parallaxes and proper motions measured by VLBI. Our sample includes 73 masers spanning the range of Galactocentric distances from 3 to 14 kpc. The solutions found are Omega(0) = 28.86 +/- 0.45 km s(-1) kpc(-1), Omega%26apos;(0) = -3.96 +/- 0.09 km s(-1) kpc(-2), Omega%26apos;%26apos;(0) = 0.790 +/- 0.027 km s(-1) kpc(-3), and R-0 = 8.3 +/- 0.2 kpc. In this case, the linear rotation velocity at the solar distance R-0 is V = 241 +/- 7 km s(-1). Note that we have obtained the R-0 estimate, which is of greatest interest, from masers for the first time; it is in good agreement with the most recent estimates and even surpasses them in accuracy.

• 出版日期2014-7