Abstract
We report here preliminary results of a study of the long‐term temporal variability of three black‐hole candidate (BHC) sources detected with the Burst and Transient Source Experiment (BATSE) onboard the Compton Gamma‐Ray Observatory (CGRO). We detected peaked noise in several cases in the Power Density Spectrum (PDS) of the Fast Fourier Transform (FFT) in all these sources. The peaks are invariably in the range of 10–200 mHz. We present the evolution of the PDS during the outbursts of the two transient BHC (GRO J0422+32 and GX339−4) and a sample of the evolving PDS of the third source (Cyg X‐1) over the 2.5 years of BATSE monitoring of this source.
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