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XMM-Newton and NuSTAR multiple exposures allow us to disentangle thedifferent emission components of active galactic nuclei (AGNs) and to study theevolution of their different spectral features. In this work, we present thetiming and spectral properties of five simultaneous XMM-Newton and NuSTARobservations of the Narrow Line Seyfert 1 galaxy Mrk 359. We aim to provide thefirst broadband spectral modeling of Mrk 359 describing its emission spectrumfrom the UV up to the hard X-rays. To do this, we performed temporal andspectral data analysis, characterising the amplitude and spectral changes ofthe Mrk 359 time series and computing the 2-10 keV normalised excess variance.The spectral broadband modelling assumes the standard hot Comptonising coronaand reflection component, while for the soft excess we tested two differentmodels: a warm, optically thick Comptonising corona (the two-corona model) anda reflection model in which the soft-excess is the result of a blurredreflected continuum and line emission (the reflection model). High and low fluxstates were observed during the campaign. The former state has a softerspectral shape, while the latter shows a harder one. The photon index is in the1.75-1.89 range, and only a lower limit to the hot-corona electron temperaturecan be found. A constant reflection component, likely associated with distantmatter, is observed. Regarding the soft excess, we found that among thereflection models we tested, the one providing the better fit (reduced$\chi^2$=1.14) is the high-density one. However, a significantly better fit(reduced $\chi^2$=1.08) is found by modelling the soft excess with a warmComptonisation model. The present analysis suggests the two-corona model as thebest scenario for the optical-UV to X-ray emission spectrum of Mrk 359.

The soft excess of the NLS1 galaxy Mrk 359 studied with an XMM-Newton-NuSTAR monitoring campaign