论文标题
M 84 Inner Jet/反播的多频VLBI观察
Multi-frequency VLBI Observations of the M 84 Inner Jet/Counterjet
论文作者
论文摘要
附近活性银河核（AGN）中边缘喷气机的内部区域的观察性研究对于理解其运动学和形态至关重要。对于M 84中附近低光度AGN的内部射流，我们提出了自2019年以来基线干涉率很长的新的高灵敏度观察结果，以及2014年的档案非常长的基线阵列观测值。我们发现M 84中的紧凑型核心具有1.5至88 GHz的倒数频谱。基于频谱中$ 4.2 \ pm 0.2 $ GHz的周转频率，我们估计磁场强度为1-10mg，电子数密度为$ \ sim 10^5 cm^{ - 3} $在核心区域。 $ \ sim 3 $ MAS内的三个内喷射组件在22 GHz的图像中被识别并追溯，其明显速度分别为0.11 c，0.27 c和0.32 c。我们根据适当的运动和射流与接口夹的通量比，计算内射流的$ \ sim58 $度的视角。波长为$ \ sim 3.4 $ MAS的传播正弦模型用于适合喷气机的螺旋形态扩展到20 mas（$ \ sim 2.2 \ times 10^4 $ schwarzschild radii）。
Observational studies of inner-most regions of the edge-on jets in nearby active galactic nuclei (AGN) are crucial to understand their kinematics and morphology. For the inner jet of the nearby low luminosity AGN in M 84, we present new high-sensitivity observations with very long baseline interferometry since 2019, as well as archival Very Long Baseline Array observations in 2014. We find that the compact core in M 84 has an inverted-to-flat spectrum from 1.5 to 88 GHz. Based on the turnover frequency of $4.2\pm 0.2$ GHz in the spectrum, we estimated a magnetic field strength of 1-10mG and an electron number density of $\sim 10^5 cm^{-3}$ in the core region. Three inner jet components within $\sim 3$ mas from the core are identified and traced in the images at 22 GHz, whose apparent speeds are 0.11 c, 0.27 c, and 0.32 c, respectively. We calculate the viewing angle of $\sim58$ degree for the inner jet based on the proper motion and the flux ratio of jet-to-counterjet. A propagating sinusoidal model with a wavelength of $\sim 3.4$ mas is used to fit the helical morphology of the jet extended to 20 mas ($\sim 2.2\times 10^4$ Schwarzschild Radii).
