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

Abstract : 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.
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Journal articles
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2011, 417, pp.1140-1147. <10.1111/J.1365-2966.2011.19335.X>


https://hal.archives-ouvertes.fr/hal-00656096
Contributor : Volker Beckmann <>
Submitted on : Tuesday, January 3, 2012 - 3:34:24 PM
Last modification on : Thursday, April 23, 2015 - 2:08:19 PM

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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, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2011, 417, pp.1140-1147. <10.1111/J.1365-2966.2011.19335.X>. <hal-00656096>

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