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The ABC of low-frequency quasi-periodic oscillations in Black-Hole Candidates: analogies with Z-sources

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arxiv astro-ph/0504318 v1 pith:QAIWMTLT submitted 2005-04-14 astro-ph

P. Casella (1 , 2) , T. Belloni (1) , L. Stella (2) ((1) INAF - Oss. Brera , (2) INAF - Oss. Roma) This is my paper · ORCID
classification astro-ph
keywords oscillationsanalogiescandidatescorrelationfractionallfqposlow-frequencymain
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Three main types of low-frequency quasi-periodic oscillations (LFQPOs) have been observed in Black Hole Candidates. We re-analyzed RXTE data of the bright systems XTE J1859+226, XTE J1550-564 and GX 339-4, which show all three of them. We review the main properties of these LFQPOs and show that they follow a well-defined correlation in a fractional rms vs. softness diagram. We show that the frequency behavior through this correlation presents clear analogies with that of Horizontal-, Normal- and Flaring-Branch Oscillations in Z sources, with the inverse of the fractional rms being the equivalent of the curvilinear coordinate Sz through the Z track.

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Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Discovery of a quasi-periodic oscillation non-harmonically related to the Type-C QPO in the hard intermedidate state of MAXI J1820+070

    astro-ph.HE 2026-06 unverdicted novelty 7.0 of 10

    Detection of a non-harmonic QPO precursor to Type-B in the HIMS of MAXI J1820+070 using NICER timing data.

  2. Phase-resolved QPO Analysis of GX 339-4: Improved Technique and Consistent Behaviors between QPOs and Broadband Noise

    astro-ph.HE 2026-08 conditional novelty 6.0 of 10

    Type-C QPOs and broadband noise in GX 339-4 show consistent phase-resolved spectral behavior, suggesting a shared physical origin and favoring corona oscillation models.

  3. The emergence of X-ray emission lines during relativistic radio-jet formation in the changing-look active galactic nucleus 1ES 1927+654

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    X-ray emission lines and a broad iron feature emerged in changing-look AGN 1ES 1927+654 concurrently with radio-jet formation and declining ionized outflows from 2022 to 2025.

  4. Quasi-Periodic Oscillations due to radiative feedback mechanism between the disc and corona

    astro-ph.HE 2025-07 conditional novelty 6.0 of 10

    A disc-corona radiative feedback loop with a time delay produces QPOs at 1/(tau_A+tau_B), and its analytic power spectrum fits AstroSat data of two black hole binaries.

  5. An atypical X-ray variability component in the black hole candidate AT2019wey

    astro-ph.HE 2026-06 unverdicted novelty 5.0 of 10

    Detection of an imaginary QPO in AT2019wey whose frequency drops from ~5 Hz to ~1 Hz with rising phase lags as the source transitions through HIMS and LHS, showing U-shaped phase-lag spectrum in HIMS.

  6. Understanding corona and disk evolution in black hole X-ray binaries through a comprehensive study of their broadband variability and QPO characteristics

    astro-ph.HE 2026-05 unverdicted novelty 4.0 of 10

    Comprehensive analysis of AstroSat data shows a sign change in QPO time lags at ~2 Hz for high-inclination sources, consistent with a transition from elongated jet-like to compact corona.

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