Title: Probing the physics of high-energy spectra of NGC 4151 and IC 4329A with INTEGRAL
Proposal ID: 0120114
Subject category: Extragalactic Object
Principal investigator: Zdziarski
Institute: Nikolaus Copernicus Astronomical Center
Abstract
We propose observations of 2 brightest Seyfert 1s, NGC 4151 and IC 4329A, with exposure of 7.5E5 s each. The
main goal of the observations is to accurately measure the shape of their high-energy, >100 keV, spectra.
This will allow us to determine the relative contribution of thermal and non-thermal Comptonization in the
sources. The presence of non-thermal Comptonization will lead to power-law like tails as well as broad pair
annihilation features beyond the thermal cutoff. Such measurements will have profound theoretical
consequences. Furthermore, we will study short-time scale variability of the sources and correlations
between various spectral components. This will further constrain the physical processes and geometry of the
sources. The field of view of IC 4329A also contains the famous MCG-6-30-15, which spectrum we will measure
as well. For all observations, we will apply for XMM time, to provide simultaneous detailed measurements of
the Fe K line and edge complex.