Time-Dependent Ionized Reflection: Major Implications for Fe Kα Reverberation Studies of AGN.

Details Time-Dependent Ionized Reflection: Major Implications for Fe Kα Reverberation Studies of AGN. Time-Dependent Ionized Reflection: Major Implications for Fe Kα Reverberation Studies of AGN.

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.2106n&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #21.06; Bulletin of the American Astronomical Society, Vol. 32, p.1437

Astronomy and Astrophysics

Astronomy

Scientific paper

We discuss the influence of the thermal ionization instability (see Nayakshin, Kazanas & Kallman 2000) on the studies of Fe Kα reverberation in AGN. We show that the density structure of the illuminated gas reacts slowly to changes in the incident X-rays, which leads to a very complex line variability behavior under certain conditions. We find that if X-ray luminosity of the source exceeds ~ a percent of the Eddington limit, then rapid variations in the X-ray flux will result in rather complex and observationally seemingly chaotic changes in the integrated flux of the line and its profile. We also discuss the implications of our results for current and future Fe Kα line reverberations missions, such as Constellation-X. In particular, we point out the importance of the high energy part of the spectrum that is not going to be measured by Constellation-X. We show that AGN that are only moderately bright and/or have steep X-ray spectrum should be the best candidates in which to observe the line reverberation. This work was supported by the National Research Council.

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