Euclid: Early Release Observations – Programme overview and pipeline for compact- and diffuse-emission photometry

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Volume 697 (May 2025)

A&A, 697 (2025) A6

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Table 3

Encircled energy of the Euclid extended PSF.

Radius (arcsec)	I_E	Y_E	J_E	H_E
0.1	0.36300	0.11880	0.11067	0.09818
0.2	0.66571	0.39405	0.35903	0.31939
0.3	0.78320	0.68071	0.61916	0.54811
0.4	0.85492	0.82898	0.76611	0.68006
0.5	0.87174	0.88110	0.84034	0.75903
1.0	0.93556	0.91891	0.89640	0.88333
1.5	0.95459	0.94315	0.93054	0.91843
2.0	0.96443	0.95475	0.94425	0.93760
4.0	0.98135	0.97364	0.96855	0.96615
8.0	0.99161	0.98566	0.98242	0.98175
16.0	0.99545	0.99258	0.99116	0.99091
32.0	0.99717	0.99601	0.99551	0.99566
64.0	0.99828	0.99783	0.99785	0.99786
120.0	0.99911	0.99898	0.99913	0.99905
240.0	0.99987	0.99983	0.99987	0.99982
280.0	0.99999	0.99997	0.99997	0.99994
310.0	1.00000	1.00000	1.00000	1.00000

Notes. Measured as a function of radius from 0ʺ.1 to 310ʺ (there is no further signal detection beyond), derived from the ERO data set. For context, the theoretical FWHM are I_E =0ʺ.136, Y_E =0ʺ.179, J_E =0ʺ.213, and H_E =0ʺ.298.

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