Fig. 7.
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Low-surface brightness and extended Hα emission of NGC 4469. Left: continuum-subtracted Hα image of the galaxy NGC 4469 smoothed to a resolution of 2.8″. The colour scale is arbitrarily chosen to highlight the low surface brightness tail of ionised gas at the SE of the galaxy disc. Right: pseudo-colour image obtained by combining the NGVS (Ferrarese et al. 2012) optical u and g in the blue channel, the r and NB in the green channel, and the i and the continuum-subtracted Hα image (this last smoothed to a resolution of 2.8″) in the red channel.
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