论文标题
通过计时,盖亚和干涉式天文统计的脉冲星位置比较动力学和运动学参考框架
Comparison of dynamical and kinematic reference frames via pulsar positions from timing, Gaia, and interferometric astrometry
论文作者
论文摘要
脉冲星是特殊的物体,可以独立于sub-milliarcsond(MAS)精确度的时间安排,无线电干涉测量和GAIA天文学确定其位置;因此,它们提供了一种独特的方法来监视动力学和运动学参考帧之间的链接。我们的目的是评估行星埃弗默斯代表的动态参考框架与盖亚和vlbi通过脉冲星位置构建的运动学参考框架之间的方向一致性。我们从PSR $π$和MSPSR $π$项目中确定了GAIA数据版本3和62个脉冲星的49个Pulsars,其基线干涉法(VLBI)位置很长,并搜索了这些脉冲星的已发布的时机解决方案。然后,我们比较了通过定时,VLBI和GAIA测量的PULSAR位置,以估计通过迭代拟合相对于Gaia和VLBI参考帧的埃菲米帧框架的方向偏移。我们发现,相对于Gaia和VLBI框架,在DE200框架中$ \ sim $ 10 MAS的方向偏移。我们的结果在很大程度上取决于比较中使用的子集,并且可能会因档案计时数据中低估的误差而偏见,这反映了使用文献定时解决方案确定框架旋转的限制。
Pulsars are special objects whose positions can be determined independently from timing, radio interferometric, and Gaia astrometry at sub-milliarcsecond (mas) precision; thus, they provide a unique way to monitor the link between dynamical and kinematic reference frames. We aimed to assess the orientation consistency between the dynamical reference frame represented by the planetary ephemeris and the kinematic reference frames constructed by Gaia and VLBI through pulsar positions. We identified 49 pulsars in Gaia Data Release 3 and 62 pulsars with very long baseline interferometry (VLBI) positions from the PSR$π$ and MSPSR$π$ projects and searched for the published timing solutions of these pulsars. We then compared pulsar positions measured by timing, VLBI, and Gaia to estimate the orientation offsets of the ephemeris frames with respect to the Gaia and VLBI reference frames by iterative fitting. We found orientation offsets of $\sim$10 mas in the DE200 frame with respect to the Gaia and VLBI frame. Our results depend strongly on the subset used in the comparison and could be biased by underestimated errors in the archival timing data, reflecting the limitation of using the literature timing solutions to determine the frame rotation.