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

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

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..587...44d&link_type=abstract

GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP Conference Proceedings, Volume 587, pp. 44-48 (2001).

Astronomy and Astrophysics

Astrophysics

3

X-Ray Binaries, X-Ray Sources, X-Ray Bursts, Photometric, Polarimetric, And Spectroscopic Instrumentation

Scientific paper

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. .

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