The NICER view of Scorpius X-1

Abstract

The Neutron Star X-ray binary Sco X-1 is one of the brightest Z-type sources in our Galaxy, showing frequent periods of flaring activity and different types of relativistic outflows. Observations with RXTE have shown that the strongest X-ray variability appears in the transition from/to the flaring state. During this transition, it has been proposed that two particular types of quasi-periodic oscillations might be connected with the ejection of the so-called ultra-relativistic flows. In this paper, we present an analysis of the first NICER observations of Sco X-1 obtained during a multi-wavelenght campaign conducted in February 2019, in order to characterise the properties of QPOs as the system evolves through its various accretion states. We compute a light-curve and a Hardness-Intensity diagram to track the evolution of the source spectral properties, while we investigate the X-ray time variability with a Dynamical Power Density Spectrum. To trace the temporal evolution of QPOs, we segment the dataset into shorter, continuous intervals, and compute and fit the averaged PDS for each interval. Our analysis shows that the overall behaviour of the source is consistent with the literature; strong QPOs around 6 Hz are detected on the normal branch, while transitions to/from the flaring branch -- occurring over timescales of a few hundreds of seconds -- are characterised by rapid, weaker quasi-periodic variability reaching frequencies up to 15 Hz. Despite limited statistical significance, we also identify faint, transient timing features above 20 Hz, occasionally coexisting with the prominent 6 Hz QPOs. Although tentative, the existence of these features in the NICER data is crucial for interpreting the simultaneous radio observations from the same multi-wavelength campaign, potentially reinforcing the connection between the ejection of relativistic outflows and the accretion states in Sco X-1.

Accepted for publication in Astronomy&Astrophysics

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