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| Titre : |
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Studying the long-time variability of the Seyfert 2 galaxy NGC 4388 with INTEGRAL and Swift |
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| Auteur(s) : |
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E. V. Fedorova, V. Beckmann1, A. Neronov, S. Soldi2 |
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| Laboratoire : |
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| équipe(s) de recherche : |
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APC - AHE |
| Résumé : |
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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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Langue du texte
intégral : |
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Anglais |
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| Journal : |
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| Audience : |
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internationale |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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| Date de publication : |
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10/2011 |
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| Volume : |
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417 |
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| Page, identifiant, ... : |
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1140-1147 |
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| Mots Clés : |
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X-rays: galaxies – galaxies: nuclei – galaxies: Seyfert |
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