Physics – Nuclear Physics
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nuphs..69..481p&link_type=abstract
Nuclear Physics B Proceedings Supplements, Volume 69, Issue 1-3, p. 481-485.
Physics
Nuclear Physics
10
Scientific paper
We present broad band timing and spectral analysis of BeppoSAX data of the Seyfert galaxy NGC 4151, and propose multi-component models to explain the complex spectrum of this source and the observed, energy dependent, spectral variability. Many different components are needed to model SAX NGC 4151 spectra. The intrinsic continuum is well described by a simple power law with energy spectral index slightly correlated with intensity (α~0.4-0.5) up to ~15keV. At higher energies an exponential cutoff is clearly detected in the PDS spectra (Ec=50+/-5keV). There is also an evidence for a flattening of the spectrum above ~15keV which is well described by a reflection model. A non-variable, complex soft component becomes dominant below ~1keV. Between 1keV and ~5keV, a complicate absorption structure reveals the presence of either a cold absorber partially covering the nuclear continuum or a very thick warm absorber, or both. Finally, a strong Iron line at 6.4keV is clearly detected, with varying equivalent width, becoming stronger as continuum intensity drops.
Feroci Marco
Fiore Fabrizio
Frontera Filippo
Grandi Paola
Mineo Teresa
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