Euclid: Discovery of bright z ≃ 7 Lyman-break galaxies in UltraVISTA and Euclid COSMOS

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Volume 707 (March 2026)

A&A, 707 (2026) A239

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Table 1.

Measured 5σ limiting magnitudes for each band used in this work in the COSMOS field.

Filter	Depth (5σ)	Instrument
g	27.8	HSC
r	27.4	HSC
i	27.2	HSC
NB0816	26.2	HSC
z	26.7	HSC
NB0921	26.0	HSC
y	26.0	HSC

Y	26.2	VISTA
J	26.0	VISTA
H	25.7	VISTA
K_s	25.3	VISTA

I_E	27.7	Euclid
Y_E	26.4	Euclid
J_E	26.4	Euclid
H_E	26.3	Euclid

3.6	25.2	Spitzer/IRAC
4.5	25.2	Spitzer/IRAC

Notes. The local depths were measured by placing $1 \overset{″}{.} 8$ $Mathematical equation: $ 1{{\overset{\prime\prime}{.}}}8 $$ diameter circular apertures on empty regions of the images. The depth quoted here is the mode of these local depths. Depths for Euclid were measured on images pixel-matched and PSF-homogenised to the VISTA Y band. IRAC depths were measured in $2 \overset{″}{.} 8$ $Mathematical equation: $ 2{{\overset{\prime\prime}{.}}}8 $$ diameter circular apertures on the original resolution image to account for the poorer resolution.

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