Left panel: continuum-subtracted Hα+[NII] image of M 87 at full resolution. Right panel: continuum-subtracted Hα+[NII] image of M 87 after a 15 × 15 boxcar smoothing, corresponding to ≃2.8 arcsec resolution. At the distance of M 87 (16.5 Mpc), 1 arcsec = 80 pc. The green dashed box indicates the zoomed-in region in Fig. 4. Smoothing reduces the noise in the outer parts, where the surface brightness sensitivity reaches Σ(Hα + [NII]) ≃ 5 × 10−18 erg s−1 cm−2 arcsec−2.
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