Fig. 2.
Continuum-subtracted Hα image of NGC 4424 with contours at Σ(Hα) = 4 × 10−18 erg s−1 cm−2 arcsec−2. A prominent tail is visible in the north-east direction extending from the ionised gas halo. The inset shows a contrasted image of the central regions (here on an arbitrary surface brightness scale) with prominent filaments of ionised gas.
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