论文标题
3C 465中喷气机的高分辨率视图
A high-resolution view of the jets in 3C 465
论文作者
论文摘要
我们使用E-Merlin的深层横向分辨无线电观察结果以及VLA的互补观测来提出WAT源3C 465中喷气机的新的高分辨率和高敏性研究。我们得出了一个下限$β_ {\ rm j} $ =（$ν_{\ rm j} $/$ c $）$ \ gtrsim $ 0.5的喷气速度和上限$θ_{\ rm j} $ j} $ j} $ $ \ $ 61 $ $ 61 $^{ The jet spectral index ($α$, defined in the sense $S \propto ν^α$) is fairly constant (<$α_{\rm jet}$> = $-$0.7), and spectral flattening within 4.4 kpc of the core coincides with bright knots and is consistent with the site of X-ray particle acceleration at the base of the radio jet found in previous studies.两个热点组件的光谱之间几乎没有差异，这可能表明在那里注入了相同特性的电子种群。 NW和SE李子是大约同源的结构，在两个区域的外部压力和密度梯度的质量注射和传播方面有所不同，可以理解NW羽流中较陡峭的频谱，<$α_{\ rm NWP} $> $ 1.43与Seplume相比，<$ nwp} $ 1.43 $ - $ 1.38。我们的同步子寿命模型支持羽流材料中颗粒的合理重新计算。总体而言，我们的结果表明，在3C 465中最有可能发挥作用的最有可能的加速机制，以$β_ {\ rm j} $> $> $> $> $> $> 0.5和$β__{\ $ <$ j {\ $ $ j} $β} $ <$ $ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ <$ 0.5，我们的结果表明，最有可能的加速机制在3C 465中发挥了最有可能的加速机制。前一种情况可以将电子加速到更高的洛伦兹因素。
We present new high-resolution and high-sensitivity studies of the jets in the WAT source 3C 465, using deep transverse-resolved radio observations from e-MERLIN, and with complementary observations from the VLA. We derive a lower limit $β_{\rm j}$ = ($ν_{\rm j}$/$c$) $\gtrsim$ 0.5 for the jet speed, and an upper limit $θ_{\rm j}$ $\lesssim$ 61$^{\circ}$ for the jet angle to the line of sight. The jet spectral index ($α$, defined in the sense $S \propto ν^α$) is fairly constant (<$α_{\rm jet}$> = $-$0.7), and spectral flattening within 4.4 kpc of the core coincides with bright knots and is consistent with the site of X-ray particle acceleration at the base of the radio jet found in previous studies. There is little difference between the spectra of the two hotspot components, plausibly indicating that electron populations of the same properties are injected there. The NW and SE plumes are approximately homologous structures, with variations in mass injection and propagation in external pressure and density gradients in the two regions plausibly accounting for the slightly steeper spectrum in the NW plume, <$α_{\rm NWp}$> = $-$1.43 compared with the SE plume, <$α_{\rm SEp}$> = $-$1.38. Our synchrotron lifetime model supports plausible reacceleration of particles within the plume materials. Overall, our results show that the first-order Fermi process at mildly relativistic and non-relativistic shocks is the most likely acceleration mechanism at play in 3C 465 and distinguish differences between the acceleration at $β_{\rm j}$ $>$ 0.5 and $β_{\rm j}$ $<$ 0.5. The former case can accelerate electrons to higher Lorentz factors.
