Non-linear behaviour of XTE J1550-564 during its 1998-1999 outburst, revealed by recurrence analysis

TL;DR

This paper investigates the non-linear dynamics of XTE J1550-564's X-ray emission during its 1998-1999 outburst using recurrence analysis, revealing state-dependent deterministic variability linked to accretion flow geometry.

Contribution

It applies recurrence analysis to X-ray light curves to identify non-linear behavior in a microquasar, highlighting state-dependent dynamics and their relation to accretion processes.

Findings

Non-linear dynamics detected in very high and soft states.

Deterministic variability varies with energy band.

Insights into disc-corona geometry and oscillations.

Abstract

We study the X-ray emission of the microquasar XTE J1550-564 and analyze the properties of its light curves using the recurrence analysis method. The indicators for non-linear dynamics of the accretion flow are found in the very high state and soft state of this source. The significance of deterministic variability depends on the energy band. We discuss the non-linear dynamics of the accretion flow in the context of the disc-corona geometry and propagating oscillations in the accretion flow.