Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..387t&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)387-(12)390
Astronomy and Astrophysics
Astronomy
1
Astronomical Models, Background Radiation, Emission Spectra, Luminosity, Seyfert Galaxies, X Ray Astronomy, X Ray Spectra, Active Galactic Nuclei, Curve Fitting, Oxygen, Proportional Counters, Rosat Mission, Supernovae, X Ray Telescopes
Scientific paper
We present six ROSAT Position-Sensitive Proportional Counter (PSPC) observations of Seyfert 1 galaxies chosen to have low Galactic line-of-sight absorption (NH approx. = 1020/sq cm). As expected, it is found that all of these sources possess significantly steeper spectra below approximately 1 keV, than that observed at higher X-ray energies. In addition we find evidence for soft X-ray spectral features, which are best parameterized as line emission at approximately 0.63 keV in NGC7469 and approximately 0.75 keV in ESO198-G24. We examine these results in the light of the accuracy of the PSPC spectral calibration. We suggest that Seyfert galaxies are a class of object whose spectra are similar to the diffuse X-ray background in the soft X-ray band. We suggest these data provide the first direct evidence that the sources which dominate the background differ as a function of energy.
George Ian Michael
Mushotzky Richard F.
Turner Tracey Jane
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