High energy X-ray observations of Sco-like sources with Ariel V

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Abstract
Observations are reported of Sco X-1 and 4U 1702 – 36 (GX349 + 2) by several of the X-ray telescopes on the Ariel V satellite, covering, in total, the energy range 2 to approximately 100 keV. They confirm the existence of a high-energy tail in the spectrum of Sco X-1 and demonstrate that 4U 1702 – 36 has a similar spectrum. Particular attention has been paid to the determination of the background counting rate in the higher part of this energy range, and the establishment of significant detections of the sources. The high-energy emission is found to be one to two orders of magnitude above the extrapolation of the low-energy emission. Evidence is presented for variation of the 26–56 keV flux from 4U 1702 – 36 by more than a factor of 4, with no ( < 1 σ) related change in the 2.9–7.6 keV signal. X-ray and radio results for these ‘Sea-type’ sources are discussed.

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