High‐energy monitoring of Seyfert galaxies: The case of NGC 4593. Issue 4 (May 2016)

• Record Type: Journal Article
• Authors: Ursini, F.; Petrucci, P.‐O.; Matt, G.; Bianchi, S.; Cappi, M.; De Marco, B.; De Rosa, A.; Malzac, J.; Ponti, G.
• Is Part Of: Astronomische Nachrichten. Volume 337:Issue 4-5(2016)
• Page Start: 552
• Page End: 556
• Publication Date: 2016-05
• Subjects: accretion, accretion disks -- galaxies: active -- galaxies: Seyfert -- X‐rays: galaxies -- X‐rays: individuals (NGC 4593); Astronomy -- Periodicals; 520.5
• DOI: 10.1002/asna.201612346
• Languages: English
• ISSNs: 0004-6337

Abstract

Abstract: We discuss preliminary results from a joint XMM‐ Newton and NuSTAR monitoring program on the active galactic nucleus NGC 4593, consisting of 5×20 ks observations, spaced by two days, performed in January 2015. The source is found to be variable, both in flux and spectral shape, on time scales as short as a few ks. The spectrum clearly softens when the source brightens. A simple timing analysis suggests the presence of a variable soft excess that correlates with the primary continuum. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)