Hadronic signatures from magnetically dominated baryon-loaded AGN jets
Hadronic signatures from magnetically dominated baryon-loaded AGN jets
复制标题
来自磁控重子负载 AGN 喷流的强子特征
DOI：
10.1093/mnras/stac3190
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发表时间：
2022
影响因子：
4.8
通讯作者：
Giannios, Dimitrios
中科院分区：
文献类型：
--
作者：
Petropoulou, Maria;Psarras, Filippos;Giannios, Dimitrios
耀变体是一类罕见的活动星系核（AGN），其相对论喷流指向观测者。喷流被认为是以坡印廷通量为主的外流，以可用的磁能为代价加速到相对论速度。在这项工作中，我们考虑电子-质子喷流，并假设粒子通过磁重联在喷流的磁化强度仍然很高（σ≥ 1）的部分通电。磁化强度和体洛伦兹因子r与每个重子的可用喷流能量有关，即μ= r（1 +σ）。我们采用了一个观测激发的关系，在Γ和质量吸积率到黑洞，这也控制了外部辐射场的亮度。我们数值计算了光子和中微子喷注发射随μ和σ的变化。我们发现耀变体SED是由加速电子的同步辐射和逆康普顿辐射产生的，而强子相关过程的发射是次主导的，除了考虑的最高磁化强度。我们发现，低光度耀变体（Lγ = 1045 erg s−1）在喷流耗散区与强度较低、速度较慢、磁化强度较高的喷流相关联。它们的宽带光子谱与BL Lac天体相似，预期的中微子光度为。高光度耀变体（Lγ = 1045 erg s−1）与更强大、更快且磁化强度更低的喷流有关。它们的宽带光子谱类似于平谱射电类星体，它们被认为是暗中微子源。
Blazars are a rare class of active galactic nuclei (AGNs) with relativistic jets pointing towards the observer. Jets are thought to be launched as Poynting-flux dominated outflows that accelerate to relativistic speeds at the expense of the available magnetic energy. In this work, we consider electron–proton jets and assume that particles are energized via magnetic reconnection in parts of the jet where the magnetization is still high (σ≥ 1). The magnetization and bulk Lorentz factor Γ are related to the available jet energy per baryon asμ= Γ(1 +σ). We adopt an observationally motivated relation between Γ and the mass accretion rate into the black hole, which also controls the luminosity of external radiation fields. We numerically compute the photon and neutrino jet emission as a function ofμandσ. We find that the blazar SED is produced by synchrotron and inverse Compton radiation of accelerated electrons, while the emission of hadronic-related processes is subdominant except for the highest magnetization considered. We show that low-luminosity blazars (Lγ≲ 1045erg s−1) are associated with less powerful, slower jets with higher magnetizations in the jet dissipation region. Their broad-band photon spectra resemble those of BL Lac objects, and the expected neutrino luminosity is. High-luminosity blazars (Lγ≫ 1045erg s−1) are associated with more powerful, faster jets with lower magnetizations. Their broad-band photon spectra resemble those of flat spectrum radio quasars, and they are expected to be dim neutrino sources with.