arXiv 2009.042612020-09-08astro-ph.GA

利用VLBI测量脉泽星和射电星视差研究银河系自转

Study of the Galactic Rotation Based on Masers and Radio Stars with VLBI Measurements of Their Parallaxes

V. V. Bobylev, O. I. Krisanova, A. T. Bajkova

备注：: 13 pages, 6 figures, 1 table. arXiv admin note: text overlap with arXiv:1903.09313, arXiv:1906.10151
发表信息：: Astronomy Letters, 2020, Vol. 46, No. 7, pp. 439-448
DOI：: 10.1134/S1063773720070038

摘要：

根据已发表的资料，我们制作了256个射电源的样本，用VLBI测量了它们的三角视差和自行。这个样本包含与活跃恒星形成区的大质量原恒星和恒星有关的银河脉泽。它还包括来自古尔德带地区的年轻低质量恒星，其射电观测是连续进行的。在这个迄今为止最完整的源样本的基础上，我们估计了速度$(U,V,W)_\odot$和银河系自转角速度参数$Ω_0, Ω^{(1)}_0, ... , Ω^{(4)}_0$，并得到了太阳到银河系中心距离的新估计值$R_0=8.15^{+0.04}_{-0.20}$ kpc。银河系螺旋密度波的参数已经从恒星的径向速度$V_R$和剩余切向速度$ΔV_{circ}$中找到。径向和切向速度扰动的振幅分别为$f_R=7.0\pm0.9$ km s $^{-1}$和$f_θ=3.8\pm1.1$ km s $^{-1}$，扰动波长分别为$λ_R=2.3\pm0.2$ kpc和$λ_θ=2.0\pm0.4$ kpc，对于所采用的四臂螺旋模式，螺旋密度波中太阳的相位分别为$(χ_\odot)_R=-163^\circ\pm9^\circ$和$(χ_\odot)_θ=-137^\circ\pm10^\circ$.

英文摘要：

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 $(U,V,W)_\odot$ and the parameters of the angular velocity of Galactic rotation $Ω_0, Ω^{(1)}_0, ... , Ω^{(4)}_0$ and obtained a new estimate of the distance fromthe Sun to the Galactic center, $R_0=8.15^{+0.04}_{-0.20}$ kpc. The parameters of the Galactic spiral density wave have been found from the series of radial, $V_R$, and residual tangential, $ΔV_{circ}$, velocities of stars. The amplitudes of the radial and tangential velocity perturbations are $f_R=7.0\pm0.9$ km s$^{-1}$ and $f_θ=3.8\pm1.1$ km s$^{-1}$, the perturbation wavelengths are $λ_R=2.3\pm0.2$ kpc and $λ_θ=2.0\pm0.4$ kpc, and the Sun's phases in the spiral density wave are $(χ_\odot)_R=-163^\circ\pm9^\circ$ and $(χ_\odot)_θ=-137^\circ\pm10^\circ$ for the adopted four-armed spiral pattern.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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英文摘要：

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