Euclid: early release observations : NISP-only sources and the search for luminous z = 6-8 galaxies
This paper presents a search for high redshift galaxies from the Euclid Early Release Observations program ‘Magnifying Lens.’ The 1.5 deg<sup>2<sup/> area covered by the twin Abell lensing cluster fields is comparable in size to the few other deep near-infrared surveys such as COSMOS, an...
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| Main Authors: | , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
May 2025
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| In: |
Astronomy and astrophysics
Year: 2025, Volume: 697, Pages: 1-17 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/202450794 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202450794 Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2025/05/aa50794-24/aa50794-24.html 
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| Author Notes: | J.R. Weaver, S. Belladitta, E. Bañados, M. Schirmer, K. Jahnke, G. Seidel, Z. Sakr [und 182 weitere] |
| Summary: | This paper presents a search for high redshift galaxies from the Euclid Early Release Observations program ‘Magnifying Lens.’ The 1.5 deg<sup>2<sup/> area covered by the twin Abell lensing cluster fields is comparable in size to the few other deep near-infrared surveys such as COSMOS, and so provides an opportunity to significantly increase known samples of rare UV-bright galaxies at z ≈ 6-8 (M<sub>UV<sub/> ≲ −22). Beyond their still uncertain role in reionisation, these UV-bright galaxies are ideal laboratories from which to study galaxy formation and constrain the bright-end of the UV luminosity function. Of the 501 994 sources detected from a combined Y<sub>E<sub/>, J<sub>E<sub/>, and H<sub>E<sub/> NISP detection image, 168 do not have any appreciable VIS/I<sub>E<sub/> flux. These objects span a range in spectral colours, separated into two classes: 139 extremely red sources; and 29 Lyman-break galaxy candidates. Best-fit redshifts and spectral templates suggest the former is composed of both z ≳ 5 dusty star-forming galaxies and z ≈ 1-3 quiescent systems. The latter is composed of more homogeneous Lyman-break galaxies at z ≈ 6-8. In both cases, contamination by L- and T-type dwarfs cannot be ruled out with Euclid images alone. Additional contamination from instrumental persistence is investigated using a novel time series analysis. This work lays the foundation for future searches within the Euclid Deep Fields, where thousands more z ≳ 6 Lyman-break systems and extremely red sources will be identified. |
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| Item Description: | Gesehen am 28.07.2026 |
| Physical Description: | Online Resource |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/202450794 |