发表机构
Univ. Grenoble Alpes, CNRS, IPAG（格勒诺布尔阿尔卑斯大学，法国国家科学研究中心，天体物理与行星科学研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究探讨克尔黑洞产生的超轻轴子风与星系物质相互作用，发现仅引力切伦科夫效应有效，可产生可观测信号，并可能实现轴子天文学。
AI 中文摘要
在前两篇文章中，我们解释了活动星系或类星体核心中的超大质量克尔黑洞如何在其磁层中产生大量轴子粒子。在第三部分中，我们探讨了轴子风与最近的活动星系核（AGN）周围的重子物质和轴子暗物质相互作用所产生的可观测动力学的可能性。我们考虑的轴子与宇宙学中作为暗物质主要成分的“超轻轴子”（UL-Axions）相同，它们形成玻色-爱因斯坦凝聚体，支撑一个巨大的薛定谔波。在本文中，我们研究了轴子风与宿主星系及其晕中的等离子体和氢气相互作用的性质。尽管可能的相互作用具有引人入胜的性质，但我们表明，只有一种引力切伦科夫-瓦维洛夫效应能够通过流不稳定性有效地与声波相互作用。这种不稳定性足够快，能够在宿主星系的中心区域（直到秒差距尺度）有效运行，使得对氢气和等离子体的声波进行莱曼-α诊断成为可能，并检测其21厘米的超精细发射。然而，结果表明轴子风的散射非常长，因此这些风可以传播非常远的距离并穿过其他星系。然后，风在沿其晕甚至更远的地方传播时没有显著损失，直到量子热化，这使得通过在地球上转换为伽马射线直接探测这些轴子成为可能，从而开启了本地宇宙中的轴子天文学。梅西耶87（M87）的参数表明，它是通过轴子转换为伽马射线和核球中的莱曼-α诊断来开展这些研究的良好候选者。
英文摘要
In two previous articles, we have explained how super-massive Kerr Black Holes in the nucleus of an active galaxy or quasar can generate a large amount of axion particles in their magnetosphere. In that third part, we explore the possibility of observable dynamics resulting from some interaction of an axion wind with the baryonic matter and the axionic Dark Matter in the surroundings of the closest AGNs. The axions that we have considered are the same as those Ultra Light Axions favored in cosmology as the main content of Dark Matter and which form Bose-Einstein Condensates, supporting a gigantic Schrödinger wave. In the paper we investigate what can be the nature of the interaction of the axion wind with the plasma and the hydrogen gas in the host galaxy and its halo. Despite the intriguing nature of a possible interaction, we show that only a kind of gravitational Tcherenkov-Vavilov effect can be efficiently operating with acoustic waves through a streaming instability. The instability is fast enough to operate efficiently in the central region of the host galaxy up to parsec scales and makes Lyman-alpha diagnostics of the acoustic waves of hydrogen gas and plasma possible, as well as the detection its hyperfine emission at 21 cm. However it turns out that scattering of the axion wind is very long and thus these winds could travel over very large distances and cross other galaxies. And then the wind travels without significant loss along its halo and even beyond up to quantum thermalization, which makes possible direct detection of these axions by conversion into gamma-rays on Earth, opening a possible axion astronomy in the local Universe. The parameters of Messier 87 indicate that it is a good candidate for developing these investigations both through the conversion of axions into gamma-rays and Lyman alpha diagnosis in the bulge.
Comments25 pages, to be submitted to JCAP
