Dynamics of charged particles and quasi-periodic oscillations in the vicinity of a distorted, deformed compact object embedded in a uniform magnetic field

TL;DR

This paper investigates how charged particles move and oscillate near a distorted compact object in a magnetic field, exploring their potential connection to observed high-frequency quasi-periodic oscillations in microquasars.

Contribution

It introduces a model combining gravitational and electromagnetic effects with quadrupole parameters to analyze particle dynamics and resonant oscillations near a deformed compact object.

Findings

Charged particle orbits are affected by magnetic and quadrupole parameters.

Resonant oscillation modes may explain high-frequency QPOs in microquasars.

Stability of orbits depends on system parameters and magnetic influence.

Abstract

This work presents the dynamic properties of charged test particles influenced by the gravitational and electromagnetic fields. Accordingly, in this work, we concentrate on the static and axially symmetric metric containing two quadrupole parameters. One relates to the central object, and another relates to the external distribution of matter. This metric may associate the observable effects to these parameters as dynamical degrees of freedom. The astrophysical motivation for choosing such a field is the possibility to constitute a reasonable model for an actual situation occurring in the objects' vicinity. To test the role of large-scale magnetic fields in accretion processes, we start by analyzing different bound orbits of timelike orbits under the influence of the system's different parameters. This leads to examining their stability concerning radial and/or vertical oscillations. The main focus is to discuss the effect of magnetic field on the oscillation modes' resonant phenomena using different resonant models for disc-oscillation modes. In the present contribution, we further explore the possibility of relating oscillatory frequencies of charged particles to the frequencies of the high-frequency quasi-periodic oscillations observed in the microquasars GRS 1915+105, XTE 1550-564 and GRO 1655-40 via assuming the relevance of resonant phenomena of the radial and vertical oscillations.