On the relative importance of hadronic emission processes along the jet axis of active galactic nuclei

On the relative importance of hadronic emission processes along the jet axis of active galactic nuclei
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关于沿活动星系核射流轴的强子发射过程的相对重要性

DOI:
10.1093/mnras/staa1650
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发表时间:
2020
影响因子:
4.8
通讯作者:
Becker Tjus J
Becker Tjus J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Becker Tjus J

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随着对耀变体TXS0506 +056的γ射线耀斑和中微子的同时探测,活动星系核(AGN)作为扩散中微子流的可能来源已成为人们关注的焦点。我们提出了一个等离子体团的高能粒子发射的空间和时间分辨模型,假设旅行沿着轴的活动星系核喷流在相对论速度。这是通过修改公开可用的rpropa(版本3.1+)传播框架,在我们的工作是能够被应用到源物理的次千秒差距尺度。一个人口的初级质子的传播建模在一个纯粹的湍流磁场,我们考虑到这些质子与散射的吸积盘,同步辐射周围的相对论电子,以及与自己和其他环境物质的光子的相互作用。我们的模型产生的PeV中微子耀斑所造成的主要是光强子与吸积盘场的相互作用。次级高能伽马射线部分地随着环境光子场而衰减,其组合光学深度对于约10 TeV的光子实现其最小不透明度。因此,我们的模型是很好的能够产生中微子耀斑与显着减少发射的伽马射线在喷流与强子喷流组件,在未来可以适合特定的活动星系核耀斑的情况。
With the coincident detection of a gamma-ray flare and a neutrino from the blazar TXS 0506+056, active galactic nuclei (AGNs) have been put into focus as possible sources of the diffuse neutrino flux. We present a space and time-resolved model of the high-energy particle emission of a plasmoid assumed to travel along the axis of an AGN jet at relativistic speed. This was achieved by modifying the publicly availablecrpropa(version 3.1+) propagation framework that in our work is capable of being applied to source physics on sub-kpc scales. The propagation of a population of primary protons is modelled in a purely turbulent magnetic field and we take into account interactions of these protons with photons scattered from the accretion disc, synchrotron radiation emitted by ambient relativistic electrons, as well with themselves and with other ambient matter. Our model produces a PeV-neutrino flare caused mainly by photohadronic interactions of primaries with the accretion disc field. Secondary high-energy gamma-rays partly attenuate with the ambient photon fields whose combined optical depths achieve their minimal opacity for photons of around 10 TeV. Thus, our model is well capable of producing neutrino flares with a significantly reduced emission of gamma-rays in jets with a hadronic jet component that in the future can be fit to specific AGN flare scenarios.
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