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Abstract: Using Rossi X-ray Timing Explorer Seyfert 1 and 1.2 data spanning 9 years, westudy correlations between X-ray spectral features. The sample consists of 350time-resolved spectra from 12 Seyfert 1 and 1.2 galaxies. Each spectrum isfitted to a model with an intrinsic powerlaw X-ray spectrum produced close tothe central black hole that is reprocessed and absorbed by material around theblack hole. To test the robustness of our results, we performed Monte Carlosimulations of the spectral sample. We find a complex relationship between theiron line equivalent width EW and the underlying power law index Gamma. Thedata reveal a correlation between Gamma and EW which turns over at Gamma <~ 2,but finds a weak anti-correlation for steeper photon indices. We propose thatthis relationship is driven by dilution of a disk spectrum which includes thenarrow iron line by a beamed jet component and, hence, could be used as adiagnostic of jet-dominance. In addition, our sample shows a strong correlationbetween the reflection fraction R and Gamma, but we find that it is likelythe result of modeling degeneracies. We also see the X-ray Baldwin effect ananti-correlation between the 2-10 keV X-ray luminosity and EW for the sampleas a whole, but not for the individual galaxies and galaxy types.

Author: Barbara J. Mattson, Kimberly A. Weaver, Christopher S. Reynolds

Source: https://arxiv.org/


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