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arXiv 2210.09795astro-ph.HE
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3C 84无线电波- $γ$射线连接的多波段研究与探索

A multiband study and exploration of the radio wave - $γ$-ray connection in 3C 84

G. F. Paraschos, V. Mpisketzis, J. -Y. Kim, G. Witzel, T. P. Krichbaum, J. A. Zensus, M. A. Gurwell, A. Lähteenmäki, M. Tornikoski, S. Kiehlmann, A. C. S. Readhead

摘要:

总强度变化光变曲线提供了一个独特的见解正在进行的辩论有关发射机制的喷气机。对于这项工作,我们利用无线电和$γ$ -射线光变曲线在几十年的无线电源3C 84(NGC 1275)的可用性。我们通过离散互相关和高斯过程回归计算了光变曲线中耀斑之间的多波段时间滞后。我们发现,射流粒子和磁场的能量密度是均分($k_\textrm{r} = 1.08\pm0.18$)。喷流顶点位于3 mm射电核心上游的$z_\textrm{91.5 GHz}= 22 - 645$ $R_\textrm{s}$($2 - 20 \times 10^{-3}$ pc);在该位置,磁场振幅为$B_\textrm{core}^\textrm{91.5 GHz}= 3 - 10$ G。我们的研究结果与早期的研究,利用甚长基线干涉测量是在良好的协议。此外,我们还研究了射电抛射和$γ$射线耀斑之间的时间关系。我们的结果是有利于$γ$射线发射与无线电发射。我们能够尝试性地将在43和86 GHz确定的特征喷射与突出的$γ$射线耀斑联系起来。最后,我们计算的多重参数$λ$和米歇尔磁化$σ_\textrm{M}$,并发现它们是一致的,由Blandford和Znajek 1977年机制推出的喷流。

英文摘要:

Total intensity variability light curves offer a unique insight into the ongoing debate about the launching mechanism of jets. For this work, we utilise the availability of radio and $γ$-ray light curves over a few decades of the radio source 3C 84 (NGC 1275). We calculate the multiband time lags between the flares identified in the light curves via discrete cross-correlation and Gaussian process regression. We find that the jet particle and magnetic field energy densities are in equipartition ($k_\textrm{r} = 1.08\pm0.18$). The jet apex is located $z_\textrm{91.5 GHz}= 22 - 645$ $R_\textrm{s}$ ($2 - 20 \times 10^{-3}$ pc) upstream of the 3 mm radio core; at that position, the magnetic field amplitude is $B_\textrm{core}^\textrm{91.5 GHz}= 3 - 10$ G. Our results are in good agreement with earlier studies, which utilised very-long-baseline interferometry. Furthermore, we investigate the temporal relation between the ejection of radio and $γ$-ray flares. Our results are in favour of the $γ$-ray emission being associated with the radio emission. We are able to tentatively connect the ejection of features identified at 43 and 86 GHz to prominent $γ$-ray flares. Finally, we compute the multiplicity parameter $λ$ and the Michel magnetisation $σ_\textrm{M}$ and find that they are consistent with a jet launched by the Blandford & Znajek 1977 mechanism.

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