ASCA Observations of the Spectrum of the X-Ray Background

Details ASCA Observations of the Spectrum of the X-Ray Background ASCA Observations of the Spectrum of the X-Ray Background

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47l...5g&link_type=abstract

Publications of the Astronomical Society of Japan, v.47, p.L5-L9.

Astronomy and Astrophysics

Astronomy

196

Cosmology: Diffuse Radiation, Cosmology: Observations, Galaxies: Active, Ism: Abundances, Ism: Bubbles, X-Rays: General

Scientific paper

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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