Evidence for Coronal Temperature Variation in Seyfert 2 ESO 103–035 Using NuSTAR Observations

We report flux-resolved spectroscopic analysis of the active galactic nucleus (AGN) ESO 103–035 using NuSTAR observations. Following an earlier work, we fit spectra a thermal Comptonization model with relativistic reflection component to obtain estimates coronal temperature for two flux levels. The was found increase from (errors at 1? confidence level) as increased 9.8 11.9 × 10?11 erg cm?2 s?1 in 3–78 keV band. A marginal variation high energy photon index allows both nonvarying optical depth and have varied by factor ?2. This is contrast previous work on spectroscopy AGN, Ark 564, where decrease along 10% depth. results may be understood framework AGN variability either dominated heating leading correlated or opposite effect being seen when changes seed flux.