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Tracing the power-law component in the energy spectrum of black hole candidates as a function of the QPO frequency

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arxiv astro-ph/0210517 v1 pith:T3NQRMFL submitted 2002-10-23 astro-ph

F. Vignarca (INAF-Oss. Brera/Univ. Insubria) , S. Migliari (INAF-Oss. Brera/Univ. Amsterdam) , T. Belloni (INAF-Oss. Brera) , D. Psaltis (IAS Princeton) , M. van der Klis (Univ. Amsterdam) This is my paper · ORCID
classification astro-ph
keywords frequencycandidatescharacteristicdifferentfitsobtainedparameterspower-law
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We investigated the relation between the centroid frequency of the quasi-periodic oscillation observed in the power density spectra of a sample of galactic black-hole candidates with the power-law photon index obtained from spectral fits. Our aim is to avoid inner accretion disk radius determination directly from spectral fits, given the uncertainties of the absolute values obtained in that way, but to base our analysis on the likely association of QPO frequency to a characteristic radius. We used archival RXTE data of GRS 1915+105 and published parameters for GRO 1655-40, XTE J1550-564, XTE J1748-288 and 4U 1630-47. While for low values of the QPO frequency, the two parameters are clearly correlated for each source, there is evidence for a turnoff in the correlation above a characteristic frequency, different for different sources. We discuss the possible nature of this turnoff.

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Cited by 4 Pith papers

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

  1. 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.

  2. 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.

  3. 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.

  4. 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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