Extended Data Fig. 2: Observed X-ray spectra of M81*.
From: An energetic hot wind from the low-luminosity active galactic nucleus M81*
Red: coadded Chandra/MEG 1st-order spectrum; Black: coadded Chandra/HEG 1st-order spectrum; Green: NuSTAR/FPMA spectrum; Blue: NuSTAR/FPMB spectrum. The error bars are of 1σ. The best-fit absorbed power-law model is shown by the solid lines. The ratio of residual/error is shown in the bottom panel. Significant excess is seen between 6–7 keV due to the presence of Fe lines. The spectra shown here are binned to achieve a S/N greater than 3 for better illustration, while in the actual spectral fit throughout this work the spectra are binned to have at least one count per bin to optimize the spectral resolution.
