论文标题
用7毫米的超分辨率VLBA图像解决PKS 1749+096的内部喷气机
Resolving the inner jet of PKS 1749+096 with super-resolution VLBA images at 7 mm
论文作者
论文摘要
在毫米波长下具有VLBI的活性银河核（AGN）中内部射流的高分辨率成像为相对论喷射的发射和准确性机理提供了深刻的见解。 BL LAC对象PKS 1749+096显示了一个以各种VLBI观察结果揭示的核心射流，指向东北的核心射流。为了调查喷气运动学，特别是在最小的可接收尺度和核心的基本物理条件下，内部喷气机的取向，在这项工作中，我们采用了一种超分辨率技术，即双光谱最大熵方法（BSMEM），以基于较长的基线（VLBA）（VLBA）（VLBA）的图像（vlba）（VLBA）观察到+09+pks vlbi vlbi图像。 7毫米监控程序。这些观察结果包括总共105个时期，涵盖了2009年至2019年的期间。我们发现，内喷射的堆叠图像被肢体吹散，明显的开口角为50°.0 +/- 8°.0和42°.0 +/- 6°.0在0.2和0.2和0.3 mas（0.2 mas和0.3 mas和1.4 pc）的距离上，与5个固定派的距离为0.2和0.3 mas和0.3 mas和0.3 mas的距离。 +/- 1°.0和4°.3 +/- 0°.7。此外，我们的图像在过去十年内显示了PKS 1749+096中清晰的喷射位置角度摆动。我们讨论了射流肢体亮度的可能含义以及位置角与射流峰通量密度和伽马射线亮度的连接。
High resolution imaging of inner jets in Active Galactic Nuclei (AGNs) with VLBI at millimeter wavelengths provides deep insight into the launching and collimation mechanisms of relativistic jets. The BL Lac object, PKS 1749+096, shows a core-dominated jet pointing toward the northeast on parsec-scales revealed by various VLBI observations. In order to investigate the jet kinematics, in particular, the orientation of the inner jet on the smallest accessible scales and the basic physical conditions of the core, in this work we adopted a super-resolution technique, the Bi-Spectrum Maximum Entropy Method (BSMEM), to reanalyze VLBI images based on the Very Long Baseline Array (VLBA) observations of PKS 1749+096 within the VLBA-BU-BLAZAR 7 mm monitoring program. These observations include a total of 105 epochs covering the period from 2009 to 2019. We found that the stacked image of the inner jet is limb-brightened with an apparent opening angle of 50°.0 +/- 8°.0 and 42°.0 +/- 6°.0 at the distance of 0.2 and 0.3 mas (0.9 and 1.4 pc) from the core, corresponding to an intrinsic jet opening angle of 5°.2 +/- 1°.0 and 4°.3 +/- 0°.7, respectively. In addition, our images show a clear jet position angle swing in PKS 1749+096 within the last ten years. We discuss the possible implications of jet limb brightening and the connection of the position angle with jet peak flux density and gamma-ray brightness.
