2015/10/07 by F. Ursini, P. -O. Petrucci, P.‐O. Petrucci +7
Physics and Astronomy · #Active galactic nucleus #Astronomy and Astrophysical Research #Astrophysics and Cosmic Phenomena #Flux (metallurgy) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Spectral analysis #Spectral line #Spectral shape analysis #Spectrum (functional analysis) #Spectrum analysis #astro-ph.HE
paper · pdf · doi:10.1002/asna.201612346
Proceedings of the XMM Science Workshop 2015; to appear in Astronomische Nachrichten
arxiv created 2015/10/07 · openalex publication_date 2016/05/01 · arxiv updated 2016/05/25 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/05
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)