A continuous Flaring- to Normal-branch transition in Sco X-1

Abstract

We report the first resolved rapid transition from a Flaring Branch Oscillation to a Normal Branch Oscillation in the RXTE data of the Z source Sco X-1. The transition took place on a time scale of ~100 seconds and was clearly associated to the Normal Branch-Flaring Branch vertex in the color-color diagram. We discuss the results in the context of the possible association of the Normal Branch Oscillation with other oscillations known both in Neutron-Star and Black-Hole systems, concentrating on the similarities with the narrow 4-6 Hz oscillations observed at high flux in Black-Hole Candidates.

5 pages, 4 figures, accepted for publication in Astronomy & Astrophysics

References in corpus (9)

• Correlations in the QPO Frequencies of Low Mass X-Ray Binaries and the Relativistic Precession Model
• A study of the low-frequency quasi-periodic oscillations in the X-ray light curves of the black hole candidate XTE J1859+226
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• A transient variable 6 Hz QPO from GX 339-4
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• Discovery of a ~7 Hz Quasi-Periodic Oscillation in the low-luminosity low-mass X-ray binary 4U 1820-30
• The discovery of a 7-14 Hz Quasi-Periodic Oscillation in the X-ray Transient XTE J1806-246
• A transient high-coherence oscillation in 4U 1820-30

Cited by in corpus (14)

• RXTE observations of the first transient Z source XTE J1701-462: shedding new light on mass accretion in luminous neutron star LMXBs
• Spectral Investigations of the nature of the Sco X-1 like sources
• Broad-band Spectral Evolution of Scorpius X-1 along its Color-Color Diagram
• Links between quasi-periodic oscillations and accretion states in neutron star low mass X-ray binaries
• Highly Significant Detection of X-Ray Polarization from the Brightest Accreting Neutron Star Sco X-1
• X-ray spectral and timing behavior of Scorpius X-1. Spectral hardening during the flaring branch
• A model for the Z-track phenomenon in GX 5-1 and observational evidence for the physical origins of the kHz QPO
• A connection between accretion states and the formation of ultra-relativistic outflows in a neutron star X-ray binary
• Constraining the Coronal Heights and Readjustment Velocities Based on the Detection of a Few Hundred Seconds Delays in the Z Source GX 17+2
• Fe K$\alpha$ and Fe K$\beta$ line detection in the NuSTAR spectrum of the ultra-bright Z-source Scorpius X-1
• Energy dependence of Normal Branch Oscillation in Scorpius X-1
• Ocean g-modes on transient neutron stars
• Generalized Flows around Neutron Stars
• The NICER view of Scorpius X-1