On The 5-50 Kev Energy Spectrum Of The Unresolved X-ray Background

Previous analyses of HEAO-1 proportional-counter observations of the unresolved 5--50-keV background described its spectrum in terms of a 40-keV thermal bremsstrahlung. We have used Monte-Carlo simulations of that experiment in order to determine a more precise response matrix, which incorporates effects not previously included. Here we describe the simulation, the new response matrix, a re-analysis of the HEAO-1 data, and implications for the RXTE.