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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2011

Studying the long-time variability of the Seyfert 2 galaxy NGC 4388 with INTEGRAL and Swift

Résumé

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.

Dates et versions

hal-00656096 , version 1 (03-01-2012)

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E. V. Fedorova, V. Beckmann, A. Neronov, S. Soldi. Studying the long-time variability of the Seyfert 2 galaxy NGC 4388 with INTEGRAL and Swift. Monthly Notices of the Royal Astronomical Society, 2011, 417, pp.1140-1147. ⟨10.1111/J.1365-2966.2011.19335.X⟩. ⟨hal-00656096⟩
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