The NuSTAR X-ray spectrum of the low-luminosity active galactic nucleus in NGC 7213

We present an analysis of the 3–79 keV NuSTAR spectrum of the low-luminosity active galactic nucleus NGC 7213. In agreement with past observations, we find a lower limit to the high-energy cut-off of Ec > 140 keV, no evidence for a Compton-reflected continuum and the presence of an iron K α complex, possibly produced in the broad-line region. From the application of the mytorus model, we find that the line-emitting material is consistent with the absence of a significant Compton reflection if arising from a Compton-thin torus of gas with a column density of |5.0+2.0-1.6× 10²³| cm−2. We report variability of the equivalent width of the iron lines on the time-scale of years using archival observations from XMM–Newton, Chandra and Suzaku. This analysis suggests a possible contribution from dusty gas. A fit with a Comptonization model indicates the presence of a hot corona with a temperature kTe > 40 keV and an optical depth τ ≲ 1, assuming a spherical geometry.