Fast X-ray Oscillations During Magnetar Flares

TL;DR

This paper reports the discovery of high-frequency X-ray oscillations during magnetar flares, which could enable probing neutron star interiors and dense matter physics through observational and theoretical analysis.

Contribution

It presents the first detection and analysis of global oscillation modes in neutron stars during magnetar flares, combining observational data with theoretical insights.

Findings

Detected oscillations from 20 Hz to 1800 Hz during flares

Oscillations may represent global neutron star modes

Potential to probe neutron star interiors

Abstract

The giant flares produced by highly magnetized neutron stars, "magnetars," are the brightest sources of high energy radiation outside our solar system. Serendipitous observations with NASA's Rossi X-ray Timing Explorer (RXTE) of the two most recent flares resulted in the discovery of high frequency oscillations in their X-ray fluxes. The frequencies of these oscillations range from about 20 Hz to as high as 1800 Hz, and may represent the first detection of global oscillation modes of neutron stars. Here I will present an observational and theoretical overview of these oscillations and discuss how they might allow us to probe neutron star interiors and dense matter physics.