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Monthly Notices of the Royal Astronomical Society 417 (2011) 1140-1147
Studying the long-time variability of the Seyfert 2 galaxy NGC 4388 with INTEGRAL and Swift
E. V. Fedorova, V. Beckmann1, A. Neronov, S. Soldi2
(2011-10)

We present analysis results on the Seyfert 2 galaxy NGC 4388 based on 6 yr of INTEGRAL data combined with Swift/Burst Alert Telescope survey and Swift/X-Ray Telescope pointed observations. These data, taken from 2003 to 2009, allow us to study the broad-band properties of this active galactic nucleus in the 0.3-300 keV energy range. The continuum emission of NGC 4388 is well represented by an absorbed power-law model with exponential cut-off at high energies and an upper limit on the reflection component of R < 0.5. We find slow strong variations of the hard X-ray emission, indicating both flux and spectral slope changes on the 3-6 months time-scale. In comparison with previous results on NGC 4388, the source shows a complex variability behaviour, i.e. the spectral shape and the 20-60 keV flux vary independently.
1:  APC - UMR 7164 - AstroParticule et Cosmologie
2:  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
APC - AHE
Physics/Astrophysics/High Energy Astrophysical Phenomena

Sciences of the Universe/Astrophysics/High Energy Astrophysical Phenomena
X-rays: galaxies – galaxies: nuclei – galaxies: Seyfert