Fig. 9.
Radial surface brightness profile of the Hα emission line. As central position, the position of cluster 23 has been chosen. Over plotted is a fit to the profile (solid line), consisting of a central Gaussian (dotted line) with σ = 2.38 ″ (0.50 kpc) and a Sérsic profile with an index of 1.8 to fit the extended halo with a scale length of 0.54″ (0.11 kpc).
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