论文标题
具有显着VLBI-GAIA偏移的AGN的光学极化特性
Optical polarization properties of AGN with significant VLBI-Gaia offsets
论文作者
论文摘要
以前在无线电（VLBI）和活性银河核（AGN）的无线电（VLBI）和光学（GAIA）位置之间发现该值的显着位置偏移。它们优先与Parsec尺度的喷气方向平行。发现射流下游指向下游的VLBI到GAIA偏移的AGN具有更高的光学极化，如预期的，如果扩展的光学喷头在发射中占主导地位，并将Gaia Centroid从源的物理核中移开。在观察到的低光极极化的情况下，上游偏移量具有建议的积聚磁盘的统治。线性光偏振的方向被证实可以优先与AGN中的Parsec尺度喷射，具有与环形磁场结构一致的主流喷气机。我们的发现支持观察到的位置偏移的磁盘喷射解释。这些结果呼吁对AGN光学极化监测程序的强化，以收集宝贵的观察数据。与持续的VLBI和GAIA观察结果一起，他们将允许研究人员在PARSEC量表上重建AGN中磁盘射流系统的详细模型。
Significant positional offsets of the value from 1 mas to more than 10 mas were found previously between radio (VLBI) and optical (Gaia) positions of active galactic nuclei (AGN). They happen preferentially parallel to the parsec-scale jet direction. AGN with VLBI-to-Gaia offsets pointed downstream the jet are found to have favourably higher optical polarization, as expected if extended optical jets dominate in the emission and shift the Gaia centroid away from the physical nucleus of the source. Upstream offsets with the suggested domination of accretion disks manifest themselves through the observed low optical polarization. Direction of linear optical polarization is confirmed to preferentially align with parsec-scale jets in AGN with dominant jets consistent with a toroidal magnetic field structure. Our findings support the disk-jet interpretation of the observed positional offsets. These results call on an intensification of AGN optical polarization monitoring programs in order to collect precious observational data. Taken together with the continued VLBI and Gaia observations, they will allow researchers to reconstruct detailed models of the disk-jet system in AGN on parsec scales.
