XRISM observations of NGC 7213 indicate that highly ionized iron lines cannot be uniquely attributed to photoionization or collisional ionization, with possible evidence that emitting gas density decreases at lower Eddington ratios.
E., Nicastro, F., & McHardy, I
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A XRISM Study of Highly Ionized Iron Emission Lines from the Low-Eddington-ratio AGN in NGC 7213
XRISM observations of NGC 7213 indicate that highly ionized iron lines cannot be uniquely attributed to photoionization or collisional ionization, with possible evidence that emitting gas density decreases at lower Eddington ratios.