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MCG-5-23-16 was targeted in early 2015 with a half mega-seconds observingcampaign using NuSTAR. Here we present the spectral analysis of these datasetsalong with an earlier observation and study the relativistic reflection and theprimary coronal source. The data show strong reflection features in the form ofboth narrow and broad iron lines plus a Compton reflection hump. A cutoffenergy is significantly detected in all exposures. The shape of the reflectionspectrum does not change in the two years spanned by the observations,suggesting a stable geometry. A strong positive correlation is found betweenthe cutoff energy and both the hard X-ray flux and spectral index. Themeasurements imply that the coronal plasma is not at the runawayelectron-positron pair limit, and instead contains mostly electrons. Theobserved variability in the coronal properties is driven by a variable opticaldepth. A constant heating to cooling ratio is measured implying that there is afeedback mechanism in which a significant fraction of the photons cooling thecorona are due to reprocessed hard X-rays.

A Long Look At MCG-5-23-16 With NuSTAR: I- Relativistic Reflection And Coronal Properties