The selection criteria adopted for the Einstein Observatory Medium Sensitivity survey are delineated and the results of an analysis of the source-count relation for extragalactic X ray sources is presented. Only IPC fields at least 20 deg outside of the galactic plane, and then only those images in the center of the fields, were included. A total of 345 objects were sighted in the 0.3-3.5 keV energy interval, and 77 percent were concluded to be extragalactic. Most were associated with active galactic nuclei (AGN), including Seyfert galaxies and quasars, and galactic clusters. A slope of about 1.7 was calculated for the power law of the energy spectra of AGNs and close to 1.0 for clusters.
The Euclidean slope of the X-ray source counts - A 'cosmic conspiracy'
Advances in Space Research ; 3 , 10-12
1984-01-01
Miscellaneous
No indication
English
NTIS | 2005
|NTRS | 2005
|Online Contents | 1996
Source-Counts and Background Radiation
British Library Online Contents | 1997
|Program Counts Lines of Source Code
Online Contents | 1998