利用地球比例因子测量太阳系加速度
Measurement of the solar system acceleration using the Earth scale factor
摘要：
我们提出了另一种方法来检测长期的像差漂移引起的太阳系加速由于吸引到银河系中心。该方法不受内部结构变化引起的单个射电源自行的影响。我们开发了一个程序来估计的尺度因子直接从甚长基线干涉测量（VLBI）数据分析中的源明智的模式内的全球解决方案。每个参考射电源的比例因子分别作为天体测量坐标（赤经和赤经）的函数进行估计。这种方法在观测参数的水平上将系统偶极子效应和不相关运动分开。我们处理了1979年7月至2016年5月的VLBI观测数据，获得了4,000多个参考射电源的标度因子估计。我们表明，估计突出了偶极子系统与银河系中心的方向一致。用这种方法得到了幅值为5.2 $\pm$ 0.2 μas/yr，方向为$α_G = 281°\pm 3°$和$δ_G = -35°\pm 3°$的银河系中心加速度矢量。
英文摘要：
We propose an alternative method to detect the secular aberration drift induced by the solar system acceleration due to the attraction to the Galaxy centre. This method is free of the individual radio source proper motion caused by intrinsic structure variation. We developed a procedure to estimate the scale factor directly from very long baseline interferometry (VLBI) data analysis in a source-wise mode within a global solution. The scale factor is estimated for each reference radio source individually as a function of astrometric coordinates (right ascension and declination). This approach splits the systematic dipole effect and uncorrelated motions on the level of observational parameters. We processed VLBI observations from 1979.7 to 2016.5 to obtain the scale factor estimates for more than 4,000 reference radio sources. We show that the estimates highlight a dipole systematics aligned with the direction to the centre of the Galaxy. With this method we obtained a Galactocentric acceleration vector with an amplitude of 5.2 $\pm$ 0.2 μas/yr and direction $α_G = 281°\pm 3°$ and $δ_G = -35°\pm 3°$.
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。
