English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report on the NuSTAR observations of two bright Seyfert 1 galaxies, namelyMCG +8-11-11 (100 ks) and NGC 6814 (150 ks). The main goal of theseobservations was to investigate the Comptonization mechanisms acting in theinnermost regions of AGN which are believed to be responsible for the UV/X-rayemission. The spectroscopic analysis of the NuSTAR spectra of these two sourcesrevealed that although they had different properties overall (black holemasses, luminosity and Eddington ratios) they had very similar coronalproperties. Both presented a power law spectrum with a high-energy cutoff at$\sim 150-200$ keV, a relativistically broadened Fe K$\alpha$ line and theassociated disk reflection component, plus a narrow iron line likely emitted inCompton thin and distant matter. The intrinsic continuum was well described byComptonization models that show for MCG +8-11-11 a temperature of the coronalplasma of kT$_{\rm e} \sim$ 60 keV and an extrapolated optical depth$\tau$=1.8; for NGC 6814 the coronal temperature was kT$_{\rm e} \sim$ 45 keVwith an extrapolated optical depth of $\tau$=2.5. We compare and discuss thesevalues to some most common Comptonization models which aim at explaining theenergy production and stability of coronae in active galactic nuclei.

NuSTAR spectral analysis of two bright Seyfert 1 galaxies: MCG +8-11-11 and NGC 6814