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publication

ASCA Observations of the Spectrum of the X-Ray Background

K. C. Gendreau, R. Mushotzky, A. C. Fabian, S. S. Holt, T. Kii, P. J. Serlemitsos, Y. Ogasaka, Y. Tanaka, M. W. Bautz, Y. Fukazawa, Y. Ishisaki, Y. Kohmura, K. Makishima, M. Tashiro, Y. Tsusaka, H. Kunieda, G. R. Ricker, R. K. Vanderspek

Abstract

We present initial results from ASCA on the spectrum of the Cosmic X-ray Background from 0.4 to 10 keV. About 250 ks of deep survey data has been collected from the performance verification phase of ASCA. About 110 ks of dark-earth data are used to assess the internal background. A single power-law describes the X-ray background very well in the 1 to 10 keV with no evidence for a steepening in the 1 to 3 keV range. At 1 keV, the intensity of the X-ray background is 9.6 keV s(-1) cm(-2) sr(-1) keV(-1) . Our data clearly show an excess above the extrapolation of the single power law model below 1 keV. At least part of this excess can be accounted for with a thermal component as there is evidence for OVII and OVIII emission.

 
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