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• W2194242912 abstract "A rapid timing analysis of Very Large Telescope (VLT)/ULTRACAM (optical) and RXTE (X-ray) observations of the Galactic black hole binary GX 339−4 in the low/hard, post-outburst state of 2007 June is presented. The optical light curves in the r′, g′ and u′ filters show slow (∼20 s) quasi-periodic variability. Upon this is superposed fast flaring activity on times approaching the best time resolution probed (∼50 ms in r′ and g′) and with maximum strengths of more than twice the local mean. Power spectral analysis over ∼0.004–10 Hz is presented, and shows that although the average optical variability amplitude is lower than that in X-rays, the peak variability power emerges at a higher Fourier frequency in the optical. Energetically, we measure a large optical versus X-ray flux ratio, higher than that seen on previous occasions when the source was fully jet dominated. Such a large ratio cannot be easily explained with a disc alone. Studying the optical–X-ray cross-spectrum in Fourier space shows a markedly different behaviour above and below ∼0.2 Hz. The peak of the coherence function above this threshold is associated with a short optical time lag with respect to X-rays, also seen as the dominant feature in the time-domain cross-correlation at ≈150 ms. The rms energy spectrum of these fast variations is best described by distinct physical components over the optical and X-ray regimes, and also suggests a maximal irradiated disc fraction of 20 per cent around 5000 Å. If the constant time delay is due to propagation of fluctuations to (or within) the jet, this is the clearest optical evidence to date of the location of this component. The low-frequency quasi-periodic oscillation is seen in the optical but not in X-rays, and is associated with a low coherence. Evidence of reprocessing emerges at the lowest Fourier frequencies, with optical lags at ∼10 s and strong coherence in the blue u′ filter. Consistent with this, simultaneous optical spectroscopy also shows the Bowen fluorescence blend, though its emission location is unclear. However, canonical disc reprocessing cannot dominate the optical power easily, nor explain the fast variability." @default.
• W2194242912 created "2016-06-24" @default.
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• W2194242912 date "2010-08-03" @default.
• W2194242912 modified "2023-09-30" @default.
• W2194242912 title "Rapid optical and X-ray timing observations of GX 339−4: multicomponent optical variability in the low/hard state" @default.
• W2194242912 cites W101996883 @default.
• W2194242912 cites W1570913855 @default.
• W2194242912 cites W1968699082 @default.
• W2194242912 cites W1969118998 @default.
• W2194242912 cites W1969393481 @default.
• W2194242912 cites W1970417976 @default.
• W2194242912 cites W1976409167 @default.
• W2194242912 cites W1976595981 @default.
• W2194242912 cites W1979377456 @default.
• W2194242912 cites W1983516052 @default.
• W2194242912 cites W1983777384 @default.
• W2194242912 cites W1983997351 @default.
• W2194242912 cites W1984465318 @default.
• W2194242912 cites W1988136039 @default.
• W2194242912 cites W1990571233 @default.
• W2194242912 cites W1995619964 @default.
• W2194242912 cites W2002201591 @default.
• W2194242912 cites W2003380131 @default.
• W2194242912 cites W2003755400 @default.
• W2194242912 cites W2015839678 @default.
• W2194242912 cites W2017391605 @default.
• W2194242912 cites W2021277605 @default.
• W2194242912 cites W2025826606 @default.
• W2194242912 cites W2030273358 @default.
• W2194242912 cites W2032458453 @default.
• W2194242912 cites W2033220168 @default.
• W2194242912 cites W2033705483 @default.
• W2194242912 cites W2038064876 @default.
• W2194242912 cites W2040832135 @default.
• W2194242912 cites W2044094489 @default.
• W2194242912 cites W2044169663 @default.
• W2194242912 cites W2048024219 @default.
• W2194242912 cites W2049425960 @default.
• W2194242912 cites W2052172883 @default.
• W2194242912 cites W2052926897 @default.
• W2194242912 cites W2057302115 @default.
• W2194242912 cites W2057639096 @default.
• W2194242912 cites W2061002941 @default.
• W2194242912 cites W2066007906 @default.
• W2194242912 cites W2068860926 @default.
• W2194242912 cites W2072634472 @default.
• W2194242912 cites W2072670786 @default.
• W2194242912 cites W2073189050 @default.
• W2194242912 cites W2079972634 @default.
• W2194242912 cites W2082569431 @default.
• W2194242912 cites W2083527581 @default.
• W2194242912 cites W2083852799 @default.
• W2194242912 cites W2085196473 @default.
• W2194242912 cites W2088233945 @default.
• W2194242912 cites W2088962431 @default.
• W2194242912 cites W2101696322 @default.
• W2194242912 cites W2101720986 @default.
• W2194242912 cites W2101769690 @default.
• W2194242912 cites W2106009697 @default.
• W2194242912 cites W2109215540 @default.
• W2194242912 cites W2111933858 @default.
• W2194242912 cites W2112261839 @default.
• W2194242912 cites W2113978543 @default.
• W2194242912 cites W2113986346 @default.
• W2194242912 cites W2119234795 @default.
• W2194242912 cites W2127181434 @default.
• W2194242912 cites W2135893120 @default.
• W2194242912 cites W2146450291 @default.
• W2194242912 cites W2147261005 @default.
• W2194242912 cites W2147965469 @default.
• W2194242912 cites W2148115088 @default.
• W2194242912 cites W2154706906 @default.
• W2194242912 cites W2154718864 @default.
• W2194242912 cites W2155309442 @default.
• W2194242912 cites W2166373699 @default.
• W2194242912 cites W2167635287 @default.
• W2194242912 cites W2962748949 @default.
• W2194242912 cites W2990716276 @default.
• W2194242912 cites W3098163764 @default.
• W2194242912 cites W3098292104 @default.
• W2194242912 cites W3098427692 @default.
• W2194242912 cites W3099410783 @default.
• W2194242912 cites W3100341096 @default.
• W2194242912 cites W3100631579 @default.
• W2194242912 cites W3100947325 @default.
• W2194242912 cites W3103204359 @default.

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