Predicting spin of compact objects from their QPOs: A global QPO model

TL;DR

This paper introduces a unified nonlinear oscillator model that explains QPOs across black hole and neutron star systems and predicts specific spins and angular momenta.

Contribution

It presents a novel global QPO model based on nonlinear oscillators that accounts for diverse sources and predicts key properties like spin frequency and angular momentum.

Findings

Successfully explains QPOs in multiple sources

Predicts neutron star spin frequency in Sco X-1

Estimates black hole angular momentum in GRO J1655-40 and GRS 1915+105

Abstract

We establish a unified model to explain Quasi-Periodic-Oscillation (QPO) observed from black hole and neutron star systems globally. This is based on the accreting systems thought to be damped harmonic oscillators with higher order nonlinearity. The model explains multiple properties parallelly independent of the nature of the compact object. It describes QPOs successfully for several compact sources. Based on it, we predict the spin frequency of the neutron star Sco X-1 and the specific angular momentum of black holes GRO J1655-40, GRS 1915+105.