Timescale Invariance of Rapid X-Ray Variability of the Black Hole Candidate GRO J1719−24 | Zendy

F. van der Hooft | Zendy; C. Kouveliotou | Zendy; J. van Paradijs | Zendy; B. C. Rubin | Zendy; David Crary | Zendy; M. H. Finger | Zendy; B. A. Harmon | Zendy; M. van der Klis | Zendy; W. H. G. Lewin | Zendy; J. P. Norris | Zendy; G. J. Fishman | Zendy

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Timescale Invariance of Rapid X-Ray Variability of the Black Hole Candidate GRO J1719−24

Author(s) -

F. van der Hooft,

C. Kouveliotou,

J. van Paradijs,

B. C. Rubin,

David Crary,

M. H. Finger,

B. A. Harmon,

M. van der Klis,

W. H. G. Lewin,

J. P. Norris,

G. J. Fishman

Publication year - 1996

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/309928

Subject(s) - physics , astrophysics , spectral density , oscillation (cell signaling) , spectral line , noise (video) , centroid , black hole (networking) , transient (computer programming) , power (physics) , astronomy , geometry , quantum mechanics , telecommunications , computer network , routing protocol , routing (electronic design automation) , computer science , link state routing protocol , genetics , mathematics , artificial intelligence , image (mathematics) , biology , operating system

We present the results of an analysis of the time variability of the soft X-ray transient GRO J1719-24 (Nova Oph 1993), as observed with BATSE. Our analysis covers the entire ~80 day outburst, beginning with the first detection of this black hole candidate on 1993 September 25. We obtained power density spectra (PDSs) of the data in the 20-100 keV energy band, covering the frequency interval 0.002-0.488 Hz. The PDSs show a significant quasi-periodic oscillation peak, the centroid frequency of which increased from ~0.04 Hz at the onset of the outburst to ~0.3 Hz at the end. Additional noise is present in the PDSs, which we describe in terms of two components. We find that the evolution of the PDSs can be described as a gradual stretching by a factor of ~7.5 in frequency of the power spectrum, accompanied by a decrease of the power level by the same factor, such that the integrated power in a scaled frequency interval remains constant.

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