arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2602.24088astro-ph.HE
收藏

多信使辐射源自相对论磁化喷流动力学的多区框架

Multi-messenger emission derived from relativistic magnetized jet dynamics using a multi-zone framework

Indian Institute of Technology Indore(印度印多尔理工学院);Max Planck Institute for Astronomy(马克斯·普朗克天文学研究所)

Harshita Bhuyan, Bhargav Vaidya, Christian Fendt, Aditya Sharma

AI总结:

本研究利用多区框架结合3D模拟,探讨AGN喷流中多信使辐射的产生机制及质子富集路径。

摘要:

活动星系核(AGN)的相对论喷流具有极高的能量,并在广泛的频率范围内发射辐射。尽管已有多个观测研究,但其粒子组成仍然是一个关键的开放问题。诸如TXS 0506+056这样的耀变源高能中微子的检测凸显了在AGN喷流中采用有核/电子-有核模型的可行性。为了理解此类来源高能中微子的起源,必须捕捉喷流动力学、其组成以及相对论喷流中粒子加速和冷却机制之间的复杂相互作用。在本试点研究中,我们将用于电子-有核建模的数值多区框架与AGN喷流的3D相对论磁流体动力学模拟相结合,包括外部光场。我们的框架通过在模拟喷流中空间采样将其分为多个区域,提供合成的多波段和中微子通量。我们研究了该框架在探索喷流中不同内在和外在质子富集路径的含义。本质上,我们发现对于低质子-电子数密度比,产生显著的喷流中微子通量,需要底层质子能谱具有相对平坦的谱,其幂律指数约为2.0。我们进一步发现,虽然喷流中由扭曲不稳定性触发的内在激波可以将电子加速到高能级,但可能不足以产生所选解析尺度喷流参数下的这种平坦粒子能谱。最后,为了产生显著的喷流中微子发射,我们的模拟表明需要考虑通过其他路径的粒子加速机制,无论是内部还是外部。

英文摘要:

Relativistic jets from Active Galactic Nuclei (AGN) are highly energetic and emit radiation across a wide range of frequencies. Despite several observational studies, their particle composition still remains a key open question. The detection of high-energy neutrinos from blazar sources such as TXS 0506+056 has highlighted the plausibility of hadronic/lepto-hadronic models for AGN jets. To understand the origin of high-energy neutrinos from such sources, it is imperative to capture the complex interplay between the jet dynamics, their composition, and the mechanism of particle acceleration and cooling in relativistic jets. In this pilot study, we have coupled a numerical multi-zone framework for lepto-hadronic modeling, with 3D relativistic magneto-hydrodynamic simulations of AGN jets, including external photon fields. Our framework provides synthetic multi-wavelength and neutrino flux by spatially sampling the simulated jet into multiple zones. We investigate the implications of such a framework in exploring the different intrinsic and extrinsic pathways for proton-enrichment in jets. Essentially, we find that for low proton-to-electron number density ratios, producing a substantial jet neutrino flux, requires the underlying proton energy distribution to have a relatively flat spectrum with a power-law index of $\simeq 2.0$. We further find that while intrinsic shocks triggered by kink-instabilities in the jet can accelerate electrons to high energies, they may not be sufficient to produce such flat particle energy distributions for the chosen set of parsec-scale jet parameters. Finally, to produce a significant jet neutrino emission, our simulations suggest the need to consider particle acceleration mechanisms through alternative pathways, either internal or external.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑