Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-29
Astrophys.J.661:38-51,2007
Astronomy and Astrophysics
Astrophysics
45 pages, 10 figures. Accepted for publication in ApJ
Scientific paper
10.1086/513307
We present the results from the Fourier Resolved Spectroscopy of archival XMM-Newton data of five AGN, namely, Mrk 766, NGC 3516, NGC 3783, NGC 4051 and Ark 564. This work supplements the earlier study of MCG-6-30-15 as well as those of several Galactic Black Hole Candidate sources. Our results exhibit much larger diversity than those of Galactic sources, a fact we attribute to the diversity of their masses. When we take into account this effect and combine our results with those from Cyg X-1, it seems reasonable to conclude that, at high frequencies, the slope of the Fourier-resolved spectra in accreting black hole systems decreases with increasing frequency as proportional to f^{-0.25}, irrespective of whether the system is in its High or Low state. This result implies that the flux variations in AGN are accompanied by complex spectral slope variations as well. We also find that the Fe Ka line in Mrk 766, NGC 3783 and NGC 4051 is variable on time scales ~day - 1 hour. The iron fluorescence line is absent in the spectra of the highest frequencies,and there is an indication that, just like in Cyg X-1, the equivalent width of the line in the Fourier-resolved of AGN decreases with increasing frequency.
Ioannou Zach
Kazanas Demos
Papadakis Iossif E.
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