Euclid on Sky
Open Access

Fig. 4

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Galactic cirrus contamination in the Perseus field. This illustration, particularly around UGC 2621 (located at the centre of the image), demonstrates the non-uniformity of the sky background in the IE filter. Here, the cirrus shines at surface brightness levels from 26.3 mag arcsec−2 (maximum) to 27.5 mag arcsec−2 (median), affecting the LSB detection performance. This contamination limits our ability to detect other extended emission, such as the outskirts of diffuse stellar halos. The FoV here is 5′ by 5′.

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