Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296.1043s&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 1043-1049 (SEE N90-2
Astronomy and Astrophysics
Astronomy
4
Active Galactic Nuclei, Background Radiation, Quasars, Spectrum Analysis, X Ray Spectra, Canonical Forms, Comparison, Heao 2, Imaging Techniques, Proportional Counters, X Ray Sources
Scientific paper
Einstein Imaging Proportional Counter (IPC) spectra of quasars are analyzed using alternatives to the canonical power law shape. It is found that either a log-Gaussian or a power law plus thermal bremsstrahlung shape gives fits which are equally good. For 33 quasars previously analyzed a chi-squared test requires the addition of an extra parameter, producing energy dependent curvature to the power law index. The mean values of the parameters found are close to a critical region defined by Schwartz and Tucker. The Einstein spectral measurements provide new, independent evidence that Active Galactic Nuclei (AGN) are the significant source of the X-ray background.
Qian Yachao
Schwartz Dana A.
Tucker Wallace H.
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