ASCA Observations of the Spectrum of the X-Ray Background
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.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- April 1995
- Bibcode:
- 1995PASJ...47L...5G
- Keywords:
-
- COSMOLOGY: DIFFUSE RADIATION;
- COSMOLOGY: OBSERVATIONS;
- GALAXIES: ACTIVE;
- ISM: ABUNDANCES;
- ISM: BUBBLES;
- X-RAYS: GENERAL