The Chandra ACIS-S spectra of the 6–7 keV excess region (Fig. 2c) at the N nucleus and of the SW nucleus. The spectral apertures are 1 arcsec and 0.75 arcsec in radius, respectively, and are shown in Fig. 1e (inset). The spectra are presented in flux density unit and arbitrarily shifted for visual clarity, and the energy scale has been corrected for the galaxy redshift. The N spectrum shows a possibly larger EW of Fe K at 6.4 keV than the SW spectrum and the soft X-ray lines indicating high ionization (e.g., H-like Mg and Si), as marked.
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