The Harmonic and Sideband Structure of the Kilohertz Quasi-Periodic Oscillations in Sco X-1
نویسندگان
چکیده
We use data from the Rossi X-ray Timing Explorer to search for harmonics and sidebands of the two simultaneous kilohertz quasi-periodic oscillations (kHz QPOs) in Sco X-1. We do not detect any of these harmonics or sidebands, with 95% confidence upper limits to their power between ∼ 1% and ∼ 10% of the power of the upper kHz QPO. The oscillations produced at these frequencies may be attenuated in a scattering corona around the neutron star. We find that upper limits to the unattenuated power of some of the strongest theoretically predicted harmonics and sidebands are as low as ∼ 2% of the unattenuated power of the high-frequency QPO in Sco X-1.
منابع مشابه
Study on the Correlations between the Twin Kilohertz Quasi-periodic Oscillations in Low-mass X-ray Binaries
The recently updated data of the twin kilohertz quasi-periodic oscillations (kHz QPOs) in the neutron star low-mass X-ray binaries are analyzed. The power-law fitting ν1 = a(ν2/1000) b and linear fitting ν2 = Aν1 + B are applied, individually, to the data points of four Z sources (GX 17+2, GX 340+0, GX 5-1 and Sco X-1) and four Atoll sources (4U 0614+09, 4U 1608-52, 4U 1636-53 and 4U 1728-34). ...
متن کاملCorrelations between X-ray Spectral Characteristics and Quasi-periodic Oscillations in Sco X-1
Correlations between 1-10 Hz quasi-periodic oscillations (QPOs) and spectral power law index have been reported for black hole (BH) candidate sources and one neutron star source, 4U 1728-34. An examination of QPO frequency and index relationships in Sco X-1 is reported herein. We discovered that Sco X-1, representing Z-source groups, can be adequately modeled by a simple two-component model of ...
متن کاملThe Power Spectral Properties of the Z Source Gx 340+0
We present an analysis of ∼390 ksec of data of the Z source GX 340+0 taken during 24 observations with the Rossi X -rayTiming Explorer satellite. We report the discovery of a new broad component in the power spectra. The frequency of this component varied between 9 and 14 Hz, and remained close to half that of the horizontal branch quasi-periodic oscillations (HBO). Its rms amplitude was consis...
متن کاملKilohertz Quasi-periodic Oscillation Peak Separation Is Not Constant in Scorpius X-1 Michiel
We report on a series of 20,110 counts s, 0.125 ms time-resolution Rossi X-Ray Timing Explorer observations of the Z-source and low-mass X-ray binary Scorpius X-1. Twin kilohertz quasi-periodic oscillation (QPO) peaks are obvious in nearly all observations. We find that the peak separation is not constant, as expected in some beat-frequency models, but instead varies from 1310 to 1230 Hz when t...
متن کاملThe correlations between the twin kHz QPO frequencies of LMXBs
We analyzed the recently published kHz QPO data in the neutron star low-mass X-ray binaries (LMXBs), in order to investigate the different correlations of the twin peak kilohertz quasi-periodic oscillations (kHz QPOs) in bright Z sources and in the less luminous Atoll sources. We find that a power-law relation ν1 ∼ ν 2 between the upper and the lower kHz QPOs with different indices: b ≃1.5 for ...
متن کامل