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Studies of hard X-ray tails in Z sources with HEXTE/RXTE

We report RXTE results of spectral analyses of three (Sco X-1, GX 349+2, and Cyg X-2) out of the 6 known Z sources. No hard X-ray tails were found for Cyg X-2 (<8.4×10−5 photons cm−2 s−1, 50–100 keV, 3σ) and for GX 349+2 (<7.9×10−5photons cm−2 s−1, 50–100 keV, 3σ). For Sco X-1 a variable hard X-ray tail (with an average flux of 2.0×10−3 photons cm−2 s−1, 50–100 keV) has already been reported. We compare our results to reported detections of a hard component in the spectrum of Cyg X-2 and GX 349+2. We argue that, taking into account all the results on detections of hard X-ray tails in Sco X-1 and GX 349+2, the appearance of such a component is correlated with the brightness of the thermal component.