Abstract

Based on published data, we have produced a sample of 256 radio sources whose trigonometric parallaxes and proper motions were measured by VLBI. This sample contains Galactic masers associated with massive protostars and stars in active star-forming regions. It also includes young low-mass stars from the Gould Belt region whose radio observations were performed in continuum. Based on this, most complete sample of sources to date, we have estimated the velocities \(U_{\odot}\), \(V_{\odot}\), \(W_{\odot}\) and the parameters of the angular velocity of Galactic rotation \(\Omega_{0},\Omega^{(1)}_{0},\ldots,\Omega^{(4)}_{0}\) and obtained a new estimate of the distance from the Sun to the Galactic center, \(R_{0}=8.15_{-0.20}^{+0.04}\) kpc. The parameters of the Galactic spiral density wave have been found from the series of radial, \(V_{R}\), and residual tangential, \(\Delta V_{\textrm{circ}}\), velocities of stars. The amplitudes of the radial and tangential velocity perturbations are \(f_{R}=7.0\pm 0.9\) km s\({}^{-1}\) and \(f_{\theta}=3.8\pm 1.1\) km s\({}^{-1}\), the perturbation wavelengths are \(\lambda_{R}=2.3\pm 0.2\) kpc and \(\lambda_{\theta}=2.0\pm 0.4\) kpc, and the Sun’s phases in the spiral density wave are \((\chi_{\odot})_{R}=-163^{\circ}\pm 9^{\circ}\) and \((\chi_{\odot})_{\theta}=-137^{\circ}\pm 10^{\circ}\) for the adopted four-armed spiral pattern.

中文翻译：

---

基于Masers和无线电星的银河旋转及其视差的VLBI测量研究。

摘要

根据已发布的数据，我们制作了256个无线电源的样本，这些无线电源的三角视差和适当运动是由VLBI测量的。该样本包含与大量原恒星和活跃恒星形成区中的恒星相关的银河系激子。它还包括来自古尔德带地区的年轻低质量恒星，其无线电观测是连续进行的。基于迄今为止最完整的源样本，我们估算了速度\（U _ {\ odot} \），\（V _ {\ odot} \），\（W _ {\ odot} \）和参数银河旋转角速度\（\ Omega_ {0}，\ Omega ^ {（1）} _ {0}，\ ldots，\ Omega ^ {（4）} _ {0} \）并获得新的估计太阳到银河系中心的距离，\（R_ {0} = 8.15 _ {-0.20} ^ {+ 0.04} \） kpc。银河系螺旋密度波的参数是从星的径向速度\（V_ {R} \）和残余切线\（\ Delta V _ {\ textrm {circ}} \）的序列中找到的。径向和切向速度摄动的幅度为\（f_ {R} = 7.0 \ pm 0.9 \） km s \（{} ^ {-1} \）和\（f _ {\ theta} = 3.8 \ pm 1.1 \ ） km s \（{} ^ {-1} \），摄动波长为\（\ lambda_ {R} = 2.3 \ pm 0.2 \） kpc和\（\ lambda _ {\ theta} = 2.0 \ pm 0.4 \） kpc，而螺旋密度波中的太阳相位为\（（\ chi _ {\ odot}）_ {R} =-163 ^ {\ circ} \ pm 9 ^ {\ circ} \）和\（（（chi _ {\ odot}）_ {\ theta} =-137 ^ {\ circ} \ pm 10 ^ {\ circ} \）表示采用的四臂螺旋模式。