Toward a model for HFQPOs in Microquasars

TL;DR

This paper explores a new model for high-frequency quasi-periodic oscillations in microquasars, proposing that Rossby Wave Instability in the accretion disk could explain observed variability patterns.

Contribution

It introduces a novel HFQPO model based on Rossby Wave Instability, addressing previous observational constraints and advancing understanding of microquasar variability.

Findings

RWI active in the disk can produce HFQPO-like signals

The model aligns with observed frequency ranges

Provides a framework for future observational tests

Abstract

There have been a long string of efforts to understand the source of the variability observed in microquasars but no model has yet gained wide acceptance, especially concerning the elusive High-Frequency Quasi-Periodic Oscillation (HFQPO). We first list the constraints arising from observations and how that translates for an HFQPO model. Then we present how a model based on having the Rossby Wave Instability (RWI) active in the disk could answer those constraints.