Relations between Timing Features and Colors in the X‐Ray Binary 4U 0614+09

2000/01/27 by Steve van Straaten, Eric C. Ford, Michiel van der Klis +2 · 3 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Binary number #Centroid #Low Mass #Low frequency #Neutron star #Noise (video) #Pulsars and Gravitational Waves Research #Spectral density #Spectral line #X-ray binary #astro-ph

paper · pdf · doi:10.1086/309351

ApJ, refereed

arxiv created 2000/01/27 · openalex publication_date 2000/09/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06

Abstract

We study the correlations between timing and X-ray spectral properties in the low-mass X-ray binary 4U 0614]09 using a large (265 ks) data set obtained with the Rossi X-Ray T iming Explorer.We Ðnd strong quasi-periodic oscillations (QPOs) of the X-ray Ñux, like the kilohertz QPOs in many other X-ray binaries with accreting neutron stars, with frequencies ranging from 1329 Hz down to 418 Hz and perhaps as low as 153 Hz.We report the highest frequency QPO yet from any low-mass X-ray binary at 1329 ⁴ Hz, which has implications for neutron star structure.This QPO has a 3.5 p single-trial signiÐcance ; for an estimated 40 trials the signiÐcance is 2.4 p.Besides the kilohertz QPOs, the Fourier power spectra show four additional components : high-frequency noise (HFN), described by a broken power law with a break frequency between 0.7 and 45 Hz, very low frequency noise (VLFN), which is Ðtted as a power law below 1 Hz, and two broad Lorentzians with centroid frequencies varying from 6 to 38 Hz and from 97 to 158 Hz, respectively.We Ðnd strong correlations between the frequencies of the kilohertz QPOs, the frequency of the 6È38 Hz broad Lorentzian, the break frequency of the HFN, the strength of both the HFN and the VLFN, and the position of the source in the hard X-ray color versus intensity diagram.The frequency of the 97È158 Hz Lorentzian does not correlate with these parameters.We also Ðnd that the relation between power density and break frequency of the HFN is similar to that established for black hole candidates in the low state.We suggest that the changing mass accretion rate is responsible for the correlated changes in all these parameters.

Citations

• Mechanisms for High‐Frequency Quasi‐periodic Oscillations in Neutron Star and Black Hole Binaries
• Discovery of [CLC]k[/CLC]H[CLC]z[/CLC] Quasi-periodic Oscillations in the Z Source Cygnus X-2
• Precise Measurements of the Kilohertz Quasi-periodic Oscillations in 4U 1728−34
• Discovery of a Second Kilohertz QPO in the X-Ray Binary 4U 1735−44
• Kilohertz Quasi-periodic Oscillation Peak Separation Is Not Constant in the Atoll Source 4U 1608−52
• Discovery of Submillisecond Quasi-periodic Oscillations in the X-Ray Flux of Scorpius X-1
• Discovery of Kilohertz Quasi-periodic Oscillations in GX 17+2
• Correlations between Kilohertz Quasi-periodic Oscillations and Low-Frequency Features Attributed to Radial Oscillations and Diffusive Propagation in the Viscous Boundary Layer around a Neutron Star

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• Constraints on the high-density nuclear equation of state from the phenomenology of compact stars and heavy-ion collisions