High-energy monitoring of Seyfert galaxies: The case of NGC 4593
Bianchi, S.; Cappi, M.; Ponti, G.; Petrucci, P. -O.; De Marco, B.; Malzac, J.; Matt, G.; De Rosa, A.; Ursini, F.
France, Italy, Germany
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.