EeV astrophysical neutrinos from flat spectrum radio quasars
EeV astrophysical neutrinos from flat spectrum radio quasars
复制标题
来自平谱射电类星体的 EeV 天体物理中微子
DOI：
--
复制
发表时间：
2020
影响因子：
6.5
通讯作者：
F. Vissani
中科院分区：
文献类型：
--
作者：
C. Righi;A. Palladino;F. Tavecchio;F. Vissani
上下文平谱射电类星体（FSRQ）是γ射线波段最强的耀变体。虽然它们被认为是产生高能中微子的良好候选者，但迄今为止还没有获得安全的FSRQ探测，除了PKS B1424-418的可能情况。
目标。在这项工作中，我们的目标是计算预期的高能量中微子通量从FSRQs使用标准假设的辐射场填充周围的区域的中心超大质量黑洞的属性。
方法.从FSRQ谱序列出发，假设相对论质子与内部和外部辐射场相互作用，计算了中微子谱。我们研究了不同自由参数值下的中微子谱
结果我们得到的结果是，高能中微子是自然预期从FSRQ在亚EeV-EeV的能量范围，而不是在PeV的能量。这证明了用现有技术无法观测到来自FSRQs的中微子，因为只有低于10 PeV的中微子被观测到。我们发现，对于一个不可忽略的参数范围内，FSRQs的累积通量是可比的，甚至超过预期的宇宙成因中微子通量。这一结果是有趣的，并强调了解开这些点源排放的扩散宇宙背景的重要性。
Context. Flat-spectrum radio quasars (FSRQs) are the most powerful blazars in the γ-ray band. Although they are supposed to be good candidates in producing high-energy neutrinos, no secure detection of FSRQs has been obtained to date, except for a possible case of PKS B1424-418.
Aims. In this work, our aim was to compute the expected flux of high-energy neutrinos from FSRQs using standard assumptions for the properties of the radiation fields filling the regions surrounding the central supermassive black hole.
Methods. Starting from the FSRQ spectral sequence, we computed the neutrino spectrum assuming interaction of relativistic protons with internal and external radiation fields. We studied the neutrino spectra resulting from different values of free parameters
Results. The result we obtained is that high-energy neutrinos are naturally expected from FSRQs in the sub-EeV–EeV energy range and not at PeV energies. This justifies the non-observation of neutrinos from FSRQs with the present technology, since only neutrinos below 10 PeV have been observed. We found that for a non-negligible range of the parameters, the cumulative flux from FSRQs is comparable to or even exceeds the expected cosmogenic neutrino flux. This result is intriguing and highlights the importance of disentangling these point-source emissions from the diffuse cosmogenic background.