Type I X-ray bursts, burst oscillations and kHz quasi-periodic oscillations in the neutron star system IGR J17191-2821

Abstract

We present a detailed study of the X-ray energy and power spectral properties of the neutron star transient IGR J17191-2821. We discovered four instances of pairs of simultaneous kilohertz quasi-periodic oscillations (kHz QPOs). The frequency difference between these kHz QPOs is between 315 Hz and 362 Hz. We also report on the detection of five thermonuclear type-I X-ray bursts and the discovery of burst oscillations at ~294 Hz during three of them. Finally, we report on a faint and short outburst precursor, which occurred about two months before the main outburst. Our results on the broadband spectral and variability properties allow us to firmly establish the atoll source nature of IGR J17191-2821.

9 pages, 7 figures - accepted for publication in MNRAS

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• Type I X-ray bursts and burst oscillations in the accreting millisecond X-ray pulsar IGR J17511-3057
• A uniform search for thermonuclear burst oscillations in the RXTE legacy dataset
• Timescale of twin-peak quasi-periodic oscillations and mass of accreting neutron stars
• Investigation of the emission radii of kHz QPOs for the accreting millisecond X-Ray pulsars, Atoll and Z sources
• The nature of fifty Palermo Swift-BAT hard X-ray objects through optical spectroscopy
• The Galactic LMXB Population and the Galactic Centre Region
• A Systematic Spectral-Timing Analysis of Kilohertz Quasi-Periodic Oscillations in the Rossi X-ray Timing Explorer Archive
• Statistical properties of twin kHz QPO in neutron star LMXBs
• Nuclear-powered X-ray millisecond pulsars
• Constraints on kHz QPO models and stellar EOSs from SAX J1808.4-3658, Cyg X-2 and 4U 1820-30
• Simple analytic formula relating the mass and spin of accreting compact objects to their rapid X-ray variability
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• On one-parametric formula relating the frequencies of twin-peak quasi-periodic oscillations
• A new correlation with lower kilohertz quasi-periodic oscillation frequency in the ensemble of low-mass X-ray binaries
• Discovery of twin kHz quasi periodic oscillations in the low mass X-ray binary XTE J1701-407
• Search for Intermittent X-ray Pulsations from Neutron Stars in Low Mass X-ray Binaries
• Probing the accretion disc structure by the twin kHz QPOs and spins of neutron stars in LMXBs