Long-Term X-ray Spectral Variability in Seyfert 1 Galaxies

Details Long-Term X-ray Spectral Variability in Seyfert 1 Galaxies Long-Term X-ray Spectral Variability in Seyfert 1 Galaxies

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.6303m&link_type=abstract

American Astronomical Society Meeting 203, #63.03; Bulletin of the American Astronomical Society, Vol. 35, p.1310

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Scientific paper

Direct time-resolved spectral fitting has been performed on continuous RXTE monitoring of seven Seyfert 1 galaxies in order to study their broadband spectral variability and Fe Kα variability characteristics on time scales of days to years. Variability in the Fe Kα line is not detected in some objects but is present in others, e.g., in NGC 3516, NGC 4151 and NGC 5548 there are systematic decreases in line flux by factors of ˜2--5 over 3--4 years. The Fe Kα line varies less strongly than the broadband continuum, but, like the continuum, exhibits stronger variability towards longer time scales. Relatively less model-dependent broadband fractional variability amplitude (Fvar) spectra also show weaker line variability compared to the continuum variability. Comparable systematic long-term decreases in the line and continuum are present in NGC 5548. Overall, however, there is no evidence for correlated variability between the line and continuum, severely challenging models in which the line tracks continuum variations modified only by a light-travel time delay. Local effects such as the formation of an ionized skin at the site of line emission may be relevant. The spectral fitting and Fvar spectra both support spectral softening as continuum flux increases.

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