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

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

2005-04-14

arxiv.org/abs/astro-ph/0504318v1

Astrophys.J. 629 (2005) 403-407

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, accepted by ApJ, uses emulateapj

Scientific paper

10.1086/431174

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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