Euclid: Early Release Observations – The surface brightness and colour profiles of the far outskirts of galaxies in the Perseus cluster

Open Access

Fig. 4.

Star masking process. Left: image of a 2 k × 2 k tile (i.e. 3 $\overset{'}{.}$ $\overset{\prime }{.}$ 3 × 3 $\overset{'}{.}$ $\overset{\prime }{.}$ 3), centred on NGC 1270. Middle: mask of stars and small background galaxies near NGC 1270 in the image, shown in white. Right: original image overlaid with the mask in white, illustrating the regions excluded from subsequent profile extraction.

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