We present six ROSAT Position-Sensitive Proportional Counter (PSPC) observations of Seyfert 1 galaxies chosen to have low Galactic line-of-sight absorption (N(sub H) approx. = 10(exp 20)/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.


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    Title :

    ROSAT PSPC spectra of six Seyfert 1 galaxies


    Contributors:

    Published in:

    Publication date :

    1993-12-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English


    Keywords :


    ROSAT PSPC Spectra of Six Seyfert 1 Galaxies

    Turner, T. J. / George, I. M. / Mushotzky, R. F. et al. | British Library Conference Proceedings | 1993


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    Turner, T.J. | Online Contents | 1993


    ROSAT PSPC spectra of six Seyfert 1 galaxies

    Turner, T.J. / George, I.M. / Mushotzky, R.F. | Elsevier | 1993


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