A possible interpretation for the apparent differences in LFQPO types in microquasars

TL;DR

This paper proposes that relativistic effects on the accretion-ejection instability (AEI) can explain the different types of low-frequency quasi-periodic oscillations (LFQPO) observed in microquasars, unifying their characteristics.

Contribution

It introduces a relativistic extension of the AEI model to account for all three LFQPO types in microquasars, providing a unified explanation.

Findings

Relativistic effects significantly influence the AEI behavior.

The model explains the properties of all three LFQPO types.

The approach offers a unified framework for understanding LFQPO diversity.

Abstract

In most microquasars, low-frequency quasi-periodic oscillations (LFQPO) have been classified into three types (A, B and C depending on the peak distribution in the PDS and the shape of the noise) but no explanation has been proposed yet. The accretion-ejection instability (AEI) was presented in 1999 as a possible explanation for the fast varying LFQPO that occur most often. Here we look at a possible generalization to explain the characteristics of the other two LFQPO types. It was recently shown that when the disk approaches its last stable orbit, the AEI is markedly affected by relativistic effects. We focus on the characteristics of the LFQPO that would result from the relativistic AEI and compare them with the different LFQPO types. The effects of relativity on the AEI seem to be able to explain most of the characteristics of the three types of LFQPO within one formalism.