当前位置: X-MOL 学术Res. Astron. Astrophys. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Resolving the inner jet of PKS 1749+096 with super-resolution VLBA images at 7 mm
Research in Astronomy and Astrophysics ( IF 1.8 ) Pub Date : 2021-05-20 , DOI: 10.1088/1674-4527/21/4/91
Lang Cui 1, 2 , Ru-Sen Lu 2, 3, 4 , Wei Yu 3 , Jun Liu 4 , Vctor M. Patio-lvarez 4, 5 , Qi Yuan 1, 6
Affiliation  

High resolution imaging of inner jets in Active Galactic Nuclei (AGNs) with Very Long Baseline Interferometry (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+096within the VLBA-BU-BLAZAR 7mm 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 distances 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 \sr 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.



中文翻译:

用 7 mm 的超分辨率 VLBA 图像解析 PKS 1749+096 的内部射流

使用毫米波长的超长基线干涉仪 (VLBI) 对活动星系核 (AGN) 中的内部喷流进行高分辨率成像,可以深入了解相对论喷流的发射和准直机制。BL Lac 天体 PKS 1749+096 在各种 VLBI 观测显示的秒差距尺度上显示了一个以核心为主的喷流指向东北。为了研究射流运动学,特别是内部射流在最小可及尺度上的方向和核心的基本物理条件,在这项工作中,我们采用了超分辨率技术,双谱最大熵方法( BSMEM),根据 VLBA-BU-BLAZAR 7mm 监测程序中 PKS 1749+096 的超长基线阵列 (VLBA) 观测值重新分析 VLBI 图像。这些观测包括从 2009 年到 2019 年期间的总共 105 个时期。我们发现内部喷流的叠加图像在 0.2 的距离处具有 50 0 8 0 和 42 0 6 0 的表观张角是边缘变亮的。和 0.3 mas(0.9 和 1.4 pc),分别对应于 5 2 1 0 和 4 3 0 7 的固有射流张角。此外,我们的图像显示了过去十年中 \sr 中的清晰喷射位置角摆动。我们讨论了射流增亮的可能影响以及位置角与射流峰值通量密度和伽马射线亮度的联系。分别对应于 5 2 1 0 和 4 3 0 7 的固有射流张角。此外,我们的图像显示了过去十年中 \sr 中的清晰喷射位置角摆动。我们讨论了射流增亮的可能影响以及位置角与射流峰值通量密度和伽马射线亮度的联系。分别对应于 5 2 1 0 和 4 3 0 7 的固有射流张角。此外,我们的图像显示了过去十年中 \sr 中的清晰喷射位置角摆动。我们讨论了射流增亮的可能影响以及位置角与射流峰值通量密度和伽马射线亮度的联系。

更新日期:2021-05-20
down
wechat
bug