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Type 2 active galactic nuclei (AGN) show signatures of accretion onto asupermassive black hole through strong, high-ionization, narrow emission linesextended on scales of 100s to 1000s of parsecs, but they lack the broademission lines from close in to the black hole that characterize type 1 AGN.The lack of broad emission could indicate obscuration of the innermost nuclearregions, or could indicate that the black hole is no longer strongly accreting.Since high-energy X-rays can penetrate thick obscuring columns, they have thepower to distinguish these two scenarios. We present high-energy NuSTARobservations of 9 Seyfert 2 AGN from the IRAS 12 micron survey, supplementedwith low-energy X-ray observations from Chandra, XMM-Newton, and Swift. Thegalaxies were selected to have anomalously low observed 2-10 keV luminositiescompared to their [O III] optical luminosities, a traditional diagnostic ofheavily obscured AGN, reaching into the Compton-thick regime for the highesthydrogen column densities ($N_{\rm H} > 1.5 \times 10^{24}\, {\rm cm}^{-2}$).Based on updated [O III] luminosities and intrinsic X-ray luminosities based onphysical modeling of the hard X-ray spectra, we find that one galaxy wasmisclassified as type 2 (NGC 5005) and most of the remaining AGN are obscured,including three confirmed as Compton-thick (IC 3639, NGC 1386, and NGC 3982).One galaxy, NGC 3627, appears to be recently deactivated. Compared to theoriginal sample the 9 AGN were selected from, this is a rate of approximately1%. We also find a new X-ray changing-look AGN in NGC 6890.

NuSTAR Observations of AGN with Low Observed X-ray to [OIII] Luminosity Ratios: Heavily Obscured AGN or Turned-Off AGN?