微类星体和agn中的HF-QPOs模型:黑洞周围带有CDM晕的带电粒子

IF 4.8 2区 物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS
Z. Ahal, H. El Moumni, K. Masmar
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引用次数: 0

摘要

HF QPOs是在含有黑洞或中子星的lmxb中观察到的最有趣的现象之一。在这项工作中,我们研究了嵌入均匀磁场并四面被CDM包围的类史瓦西黑洞附近带电粒子的动力学。从而更深入地了解磁性和DM分布对致密物体附近可观测现象的影响。我们首先提出了一个改进的度量,其中包含了CDM的影响,我们探索了DM和磁场如何影响电离粒子的有效势、稳定的圆轨道和逃逸条件。采用哈密顿形式,我们分析了能量边界和ISCO,证明CDM导致ISCO向外移动,而磁场倾向于将其拉向事件视界。我们计算了基本振荡频率——径向、纬度、开普勒和拉莫尔频率——并演示了它们的变化如何取决于CDM和磁场强度的综合影响。由此产生的频率结构使我们能够识别与HF QPOs相关的共振半径,特别是在微类星体中观察到的3:2比例。我们评估了QPO产生的几种理论模型,包括周转共振(ER0, ER1, ER2, ER3, ER4, ER5),相对论进动(r0, RP1, RP2),潮汐破坏(TD)和翘曲盘(WD)模型。通过对GRS 1915+105、H1743-322、XTE 1550-564和GRO 1655-40观测数据的比较拟合表明,在中等磁通\(B' = {-\,0.01,\,0,\,0.01}\)存在下,ER4模型对HF QPOs的拟合效果最好。相比之下,对于一些活动星系核(agn)中的超大质量黑洞,最适合大多数数据的模型取决于磁场强度:\(B' = 0\)为ER0, \(B' = \pm \, 0.01\)为ER5。我们的研究结果强调了在强场天体物理学中包括磁和暗物质(DM)效应的重要性,并支持使用HF QPOs作为黑洞环境的敏感探测器。这项研究为探索粒子动力学、吸积盘结构和致密天体附近DM的观测特征开辟了新的视角。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modeling HF-QPOs in microquasars and AGNs: charged particles around black holes with CDM halos

HF QPOs are among the most intriguing phenomena observed in LMXBs containing BHs or neutron stars. In this work, we investigate charged particles’ dynamics in the nearby of a Schwarzschild-like BH embedded in a uniform magnetic field and surrounded on all sides by CDM. Thereby gaining deeper insight into the influence of magnetic and DM distributions on observable phenomena near compact objects. We first present a modified metric, which incorporates the effects of a CDM, and we explore how both DM and magnetic fields influence the effective potential, stable circular orbits, and escape conditions for ionized particles. Employing a Hamiltonian formalism, we analyze the energy boundaries and ISCO, demonstrating that CDM causes an outward shift of the ISCO, while magnetic fields tend to pull it closer to the event horizon. We compute the fundamental oscillation frequencies – radial, latitudinal, Keplerian, and Larmor – and demonstrate how their variation depends on the combined influence of CDM and magnetic field strength. The resulting frequency structure allows us to identify resonance radii associated with HF QPOs, particularly those in 3:2 ratios observed in microquasars. We assess several theoretical models for QPO generation, including the Epicyclic Resonance (ER0, ER1, ER2, ER3, ER4, ER5), Relativistic Precession (RP0, RP1, RP2), Tidal Disruption (TD), and Warped Disk (WD) models. A comparative fit of observational data from GRS 1915+105, H1743-322, XTE 1550-564, and GRO 1655-40 demonstrates that the ER4 model provides the best match for HF QPOs in the presence of moderate magnetic flux \(B' = {-\,0.01,\,0,\,0.01}\). In contrast, for supermassive black holes in some active galactic nuclei (AGNs), the model that best fits the majority of the data depends on the magnetic field strength: ER0 for \(B' = 0\), and ER5 for \(B' = \pm \, 0.01\). Our results highlight the importance of including both magnetic and dark matter (DM) effects in strong-field astrophysics and support the use of HF QPOs as sensitive probes of BH environments. This study opens new perspectives for exploring particle dynamics, accretion disk structure, and observational signatures of DM near compact objects.

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来源期刊
The European Physical Journal C
The European Physical Journal C 物理-物理:粒子与场物理
CiteScore
8.10
自引率
15.90%
发文量
1008
审稿时长
2-4 weeks
期刊介绍: Experimental Physics I: Accelerator Based High-Energy Physics Hadron and lepton collider physics Lepton-nucleon scattering High-energy nuclear reactions Standard model precision tests Search for new physics beyond the standard model Heavy flavour physics Neutrino properties Particle detector developments Computational methods and analysis tools Experimental Physics II: Astroparticle Physics Dark matter searches High-energy cosmic rays Double beta decay Long baseline neutrino experiments Neutrino astronomy Axions and other weakly interacting light particles Gravitational waves and observational cosmology Particle detector developments Computational methods and analysis tools Theoretical Physics I: Phenomenology of the Standard Model and Beyond Electroweak interactions Quantum chromo dynamics Heavy quark physics and quark flavour mixing Neutrino physics Phenomenology of astro- and cosmoparticle physics Meson spectroscopy and non-perturbative QCD Low-energy effective field theories Lattice field theory High temperature QCD and heavy ion physics Phenomenology of supersymmetric extensions of the SM Phenomenology of non-supersymmetric extensions of the SM Model building and alternative models of electroweak symmetry breaking Flavour physics beyond the SM Computational algorithms and tools...etc.
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