论文标题
来自磁性重龙的AGN喷气机的HADRONIC签名
Hadronic signatures from magnetically dominated baryon-loaded AGN jets
论文作者
论文摘要
Blazars是一种罕见的活性银河核（AGN），具有相对论的喷气机，指向观察者。据认为，喷气机被推出为以po频率为主的流出，以相对论的速度加速，以牺牲可用的磁能为代价。在这项工作中，我们考虑了电子 - 普罗顿喷气机，并假设颗粒是通过磁性重新连接在磁化磁化仍然高的部分（$σ\ ge 1 $）的部分中通过磁性通电的。磁化和批量洛伦兹因子$γ$与每巴赛的可用喷气能量有关，为$μ=γ（1+σ）$。我们采用$γ$与质量积聚率之间的观察动机关系到黑洞$ \ dot {m} $，这也控制了外部辐射场的发光度。我们从数值上计算光子和中微子喷气发射作为$μ$和$σ$的函数。我们发现，大黄体SED是由同步基和加速电子的逆康普顿辐射产生的，而与考虑最高的磁化磁化强度之外，与抗激相关过程的发射是亚辅助的。我们表明，低亮度Blazar（$L_γ\ Lessim 10^{45} $ ERG S $^{ - 1} $）与较低功能较低，较慢的喷气机相关联，在喷射耗散区域中具有较高的磁化。它们的宽带光子光谱类似于BL LAC对象的光谱，预期的中微子光度为$ L_ {ν+\barν} \ sim（0.3-1）\，l_γ$。高亮度Blazars（$L_γ\ gg 10^{45} $ erg s $^{ - 1} $）与更强大，更快的喷气机相关联，磁性较低。它们的宽带光子光谱类似于平衡无线电类星体的光谱，预计它们将是$ l_ {ν+\barν} \ lll_γ$的昏暗中微子源。
Blazars are a rare class of active galactic nuclei (AGN) with relativistic jets pointing towards the observer. Jets are thought to be launched as Poynting-flux dominated outflows that accelerate to relativistic speeds at the expense of the available magnetic energy. In this work, we consider electron-proton jets and assume that particles are energized via magnetic reconnection in parts of the jet where the magnetization is still high ($σ\ge 1$). The magnetization and bulk Lorentz factor $Γ$ are related to the available jet energy per baryon as $μ=Γ(1+σ)$. We adopt an observationally motivated relation between $Γ$ and the mass accretion rate into the black hole $\dot{m}$, which also controls the luminosity of external radiation fields. We numerically compute the photon and neutrino jet emission as a function of $μ$ and $σ$. 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 ($L_γ \lesssim 10^{45}$ erg s$^{-1}$) are associated with less powerful, slower jets with higher magnetizations in the jet dissipation region. Their broadband photon spectra resemble those of BL Lac objects, and the expected neutrino luminosity is $L_{ν+\barν}\sim (0.3-1)\, L_γ$. High-luminosity blazars ($L_γ \gg 10^{45}$ erg s$^{-1}$) are associated with more powerful, faster jets with lower magnetizations. Their broadband photon spectra resemble those of flat spectrum radio quasars, and they are expected to be dim neutrino sources with $L_{ν+\barν}\ll L_γ$.
