Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mnras.417.1140f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 417, Issue 2, pp. 1140-1147.
Astronomy and Astrophysics
Astronomy
X-Rays: Galaxies, Galaxies: Nuclei, Galaxies: Seyfert
Scientific paper
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.
Beckmann Volker
Fedorova E. V.
Neronov Andrey
Soldi Simona
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