Euclid: Early Release Observations – NISP-only sources and the search for luminous z = 6–8 galaxies

J. R. Weaver; S. Taamoli; C. J.R. McPartland; L. Zalesky; N. Allen; S. Toft; D. B. Sanders; H. Atek; R. A.A. Bowler; D. Stern; C. J. Conselice; B. Mobasher; I. Szapudi; P. R.M. Eisenhardt; G. Murphree; I. Valdes; K. Ito; S. Belladitta; P. A. Oesch; S. Serjeant; D. J. Mortlock; N. A. Hatch; M. Kluge; B. Milvang-Jensen; G. Rodighiero; E. Bañados; J. M. Diego; R. Gavazzi; G. Congedo; M. Shuntov; H. Dole; P. F. Rocci; T. Saifollahi; M. Miluzio; M. Ezziati; A. C.N. Hughes; J. C. Cuillandre; R. Laureijs; S. Paltani; M. Schirmer; C. Stone; N. Aghanim; B. Altieri; A. Amara; S. Andreon; N. Auricchio; M. Baldi; A. Balestra; S. Bardelli; R. Bender; C. Bodendorf; D. Bonino; E. Branchini; M. Brescia; J. Brinchmann; S. Camera; V. Capobianco; C. Carbone; V. F. Cardone; J. Carretero; S. Casas; F. J. Castander; M. Castellano; S. Cavuoti; A. Cimatti; L. Conversi; Y. Copin; L. Corcione; F. Courbin; H. M. Courtois; A. Da Silva; H. Degaudenzi; A. M. Di Giorgio; J. Dinis; M. Douspis; F. Dubath; X. Dupac; A. Ealet; M. Farina; S. Farrens; S. Ferriol; S. Fotopoulou; M. Frailis; E. Franceschi; P. Franzetti; S. Galeotta; W. Gillard; B. Gillis; C. Giocoli; P. Gómez-Alvarez; A. Grazian; F. Grupp; L. Guzzo; S. V.H. Haugan; J. Hoar; H. Hoekstra; W. Holmes; I. Hook; F. Hormuth; A. Hornstrup; P. Hudelot; K. Jahnke; M. Jhabvala; E. Keihänen; S. Kermiche; A. Kiessling; T. Kitching; B. Kubik; M. Kümmel; M. Kunz; H. Kurki-Suonio; O. Lahav; D. Le Mignant; S. Ligori; P. B. Lilje; V. Lindholm; I. Lloro; D. Maino; E. Maiorano; O. Mansutti; O. Marggraf; K. Markovic; N. Martinet; F. Marulli; R. Massey; D. C. Masters; S. Maurogordato; H. J. McCracken; E. Medinaceli; S. Mei; M. Melchior; Y. Mellier; M. Meneghetti; E. Merlin; G. Meylan; J. J. Mohr; M. Moresco; L. Moscardini; R. Nakajima; R. C. Nichol; S. M. Niemi; C. Padilla; F. Pasian; K. Pedersen; W. J. Percival; V. Pettorino; S. Pires; G. Polenta; M. Poncet; L. A. Popa; L. Pozzetti; F. Raison; A. Renzi; J. Rhodes; G. Riccio; E. Romelli; M. Roncarelli; E. Rossetti; R. Saglia; D. Sapone; P. Schneider; T. Schrabback; A. Secroun; G. Seidel; S. Serrano; C. Sirignano; G. Sirri; L. Stanco; P. Tallada-Crespí; A. N. Taylor; H. I. Teplitz; I. Tereno; R. Toledo-Moreo; I. Tutusaus; L. Valenziano; T. Vassallo; A. Veropalumbo; Y. Wang; J. Weller; E. Zucca; C. Burigana; G. Castignani; Z. Sakr; V. Scottez; M. Viel; P. Simon; J. Martín-Fleitas; D. Scott

doi:10.1051/0004-6361/202450794

Euclid: Early Release Observations – NISP-only sources and the search for luminous z = 6–8 galaxies

J. R. Weaver^*
, S. Taamoli
, C. J.R. McPartland
, L. Zalesky
, N. Allen
, S. Toft
, D. B. Sanders
, H. Atek
, R. A.A. Bowler
, D. Stern
, C. J. Conselice
, B. Mobasher
, I. Szapudi
, P. R.M. Eisenhardt
, G. Murphree
, I. Valdes
, K. Ito
, S. Belladitta
, P. A. Oesch
, S. Serjeant

D. J. Mortlock, N. A. Hatch, M. Kluge, B. Milvang-Jensen, G. Rodighiero, E. Bañados, J. M. Diego, R. Gavazzi, G. Congedo, M. Shuntov, H. Dole, P. F. Rocci, T. Saifollahi, M. Miluzio, M. Ezziati, A. C.N. Hughes, J. C. Cuillandre, R. Laureijs, S. Paltani, M. Schirmer, C. Stone, N. Aghanim, B. Altieri, A. Amara, S. Andreon, N. Auricchio, M. Baldi, A. Balestra, S. Bardelli, R. Bender, C. Bodendorf, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, V. Capobianco, C. Carbone, V. F. Cardone, J. Carretero, S. Casas, F. J. Castander, M. Castellano, S. Cavuoti, A. Cimatti, L. Conversi, Y. Copin, L. Corcione, F. Courbin, H. M. Courtois, A. Da Silva, H. Degaudenzi, A. M. Di Giorgio, J. Dinis, M. Douspis, F. Dubath, X. Dupac, A. Ealet, M. Farina, S. Farrens, S. Ferriol, S. Fotopoulou, M. Frailis, E. Franceschi, P. Franzetti, S. Galeotta, W. Gillard, B. Gillis, C. Giocoli, P. Gómez-Alvarez, A. Grazian, F. Grupp, L. Guzzo, S. V.H. Haugan, J. Hoar, H. Hoekstra, W. Holmes, I. Hook, F. Hormuth, A. Hornstrup, P. Hudelot, K. Jahnke, M. Jhabvala, E. Keihänen, S. Kermiche, A. Kiessling, T. Kitching, B. Kubik, M. Kümmel, M. Kunz, H. Kurki-Suonio, O. Lahav, D. Le Mignant, S. Ligori, P. B. Lilje, V. Lindholm, I. Lloro, D. Maino, E. Maiorano, O. Mansutti, O. Marggraf, K. Markovic, N. Martinet, F. Marulli, R. Massey, D. C. Masters, S. Maurogordato, H. J. McCracken, E. Medinaceli, S. Mei, M. Melchior, Y. Mellier, M. Meneghetti, E. Merlin, G. Meylan, J. J. Mohr, M. Moresco, L. Moscardini, R. Nakajima, R. C. Nichol, S. M. Niemi, C. Padilla, F. Pasian, K. Pedersen, W. J. Percival, V. Pettorino, S. Pires, G. Polenta, M. Poncet, L. A. Popa, L. Pozzetti, F. Raison, A. Renzi, J. Rhodes, G. Riccio, E. Romelli, M. Roncarelli, E. Rossetti, R. Saglia, D. Sapone, P. Schneider, T. Schrabback, A. Secroun, G. Seidel, S. Serrano, C. Sirignano, G. Sirri, L. Stanco, P. Tallada-Crespí, A. N. Taylor, H. I. Teplitz, I. Tereno, R. Toledo-Moreo, I. Tutusaus, L. Valenziano, T. Vassallo, A. Veropalumbo, Y. Wang, J. Weller, E. Zucca, C. Burigana, G. Castignani, Z. Sakr, V. Scottez, M. Viel, P. Simon, J. Martín-Fleitas, D. Scott

^*Corresponding author for this work

University of Massachusetts
University of California at Riverside
University of Copenhagen
University of Hawai'i at Mānoa
Cosmic Dawn Center
Institut d’Astrophysique de Paris
University of Manchester
California Institute of Technology
The University of Tokyo
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
Open University Milton Keynes
Imperial College London
University of Nottingham
Max Planck Institute for Extraterrestrial Physics
University of Padua
Max Planck Institute for Astronomy
CSIC-UC - Institute of Physics of Cantabria
University of Edinburgh
Université Paris-Sud
University of Groningen
European Space Agency - ESA
CNRS
Université Paris-Saclay
ESTEC
University of Geneva
University of Montreal
European Space Astronomy Centre
University of Surrey
Osservatorio Astronomico di Brera
University of Bologna
Astronomical Observatory of Padua
Ludwig Maximilian University of Munich
National Institute for Astrophysics
University of Genoa
University of Naples Federico II
University of Porto
University of Turin
National Institute for Nuclear Physics
CIEMAT
RWTH Aachen University
Institute of Space Studies of Catalonia
Osservatorio Astronomico Roma
Universite Claude Bernard Lyon 1
Swiss Federal Institute of Technology Lausanne
Institut national de physique nucléaire et de physique des particules
University of Lisbon
University of Bristol
Osservatorio Astronomico di Trieste
University of Milan
University of Oslo
Leiden University
Lancaster University
Felix Hormuth Engineering
NASA Goddard Space Flight Center
University of Helsinki
University College London
Netherlands Institute for Radio Astronomy
University of Bonn
Durham University
Université Côte d'Azur
Université Paris 7
University of Applied Sciences Northwestern Switzerland
Institute for High Energy Physics
Aarhus University
University of Waterloo
Italian Space Agency
Centre national d'études spatiales
Institute of Space Science
Osservatorio Astronomico di Capodimonte
Universidad de Chile
University of Innsbruck
Technical University of Cartagena
Université de Toulouse
Saint Joseph University
University of British Columbia

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Abstract

This paper presents a search for high redshift galaxies from the Euclid Early Release Observations program ‘Magnifying Lens.’ The 1.5 deg² 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_UV ≲ -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_E, J_E, and H_E NISP detection image, 168 do not have any appreciable VIS/I_E 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.

Original language	English
Article number	A16
Journal	Astronomy and Astrophysics
Volume	697
Number of pages	17
ISSN	0004-6361
DOIs	https://doi.org/10.1051/0004-6361/202450794
Publication status	Published - 2025

Keywords

Catalogs
Galaxies: evolution
Galaxies: high-redshift

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Weaver, J. R., Taamoli, S., McPartland, C. J. R., Zalesky, L., Allen, N., Toft, S., Sanders, D. B., Atek, H., Bowler, R. A. A., Stern, D., Conselice, C. J., Mobasher, B., Szapudi, I., Eisenhardt, P. R. M., Murphree, G., Valdes, I., Ito, K., Belladitta, S., Oesch, P. A., ... Scott, D. (2025). Euclid: Early Release Observations – NISP-only sources and the search for luminous z = 6–8 galaxies. Astronomy and Astrophysics, 697, Article A16. https://doi.org/10.1051/0004-6361/202450794

@article{e55071b6fe7b47bab4a7c356da2bdc33,

title = "Euclid: Early Release Observations {\textendash} NISP-only sources and the search for luminous z = 6{\textendash}8 galaxies",

abstract = "This paper presents a search for high redshift galaxies from the Euclid Early Release Observations program {\textquoteleft}Magnifying Lens.{\textquoteright} The 1.5 deg2 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{\textendash}8 (MUV ≲ -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 YE, JE, and HE NISP detection image, 168 do not have any appreciable VIS/IE 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{\textendash}3 quiescent systems. The latter is composed of more homogeneous Lyman-break galaxies at z ≈ 6{\textendash}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.",

keywords = "Catalogs, Galaxies: evolution, Galaxies: high-redshift",

author = "Weaver, \{J. R.\} and S. Taamoli and McPartland, \{C. J.R.\} and L. Zalesky and N. Allen and S. Toft and Sanders, \{D. B.\} and H. Atek and Bowler, \{R. A.A.\} and D. Stern and Conselice, \{C. J.\} and B. Mobasher and I. Szapudi and Eisenhardt, \{P. R.M.\} and G. Murphree and I. Valdes and K. Ito and S. Belladitta and Oesch, \{P. A.\} and S. Serjeant and Mortlock, \{D. J.\} and Hatch, \{N. A.\} and M. Kluge and B. Milvang-Jensen and G. Rodighiero and E. Ba{\~n}ados and Diego, \{J. M.\} and R. Gavazzi and G. Congedo and M. Shuntov and H. Dole and Rocci, \{P. F.\} and T. Saifollahi and M. Miluzio and M. Ezziati and Hughes, \{A. C.N.\} and Cuillandre, \{J. C.\} and R. Laureijs and S. Paltani and M. Schirmer and C. Stone and N. Aghanim and B. Altieri and A. Amara and S. Andreon and N. Auricchio and M. Baldi and A. Balestra and S. Bardelli and R. Bender and C. Bodendorf and D. Bonino and E. Branchini and M. Brescia and J. Brinchmann and S. Camera and V. Capobianco and C. Carbone and Cardone, \{V. F.\} and J. Carretero and S. Casas and Castander, \{F. J.\} and M. Castellano and S. Cavuoti and A. Cimatti and L. Conversi and Y. Copin and L. Corcione and F. Courbin and Courtois, \{H. M.\} and \{Da Silva\}, A. and H. Degaudenzi and \{Di Giorgio\}, \{A. M.\} and J. Dinis and M. Douspis and F. Dubath and X. Dupac and A. Ealet and M. Farina and S. Farrens and S. Ferriol and S. Fotopoulou and M. Frailis and E. Franceschi and P. Franzetti and S. Galeotta and W. Gillard and B. Gillis and C. Giocoli and P. G{\'o}mez-Alvarez and A. Grazian and F. Grupp and L. Guzzo and Haugan, \{S. V.H.\} and J. Hoar and H. Hoekstra and W. Holmes and I. Hook and F. Hormuth and A. Hornstrup and P. Hudelot and K. Jahnke and M. Jhabvala and E. Keih{\"a}nen and S. Kermiche and A. Kiessling and T. Kitching and B. Kubik and M. K{\"u}mmel and M. Kunz and H. Kurki-Suonio and O. Lahav and \{Le Mignant\}, D. and S. Ligori and Lilje, \{P. B.\} and V. Lindholm and I. Lloro and D. Maino and E. Maiorano and O. Mansutti and O. Marggraf and K. Markovic and N. Martinet and F. Marulli and R. Massey and Masters, \{D. C.\} and S. Maurogordato and McCracken, \{H. J.\} and E. Medinaceli and S. Mei and M. Melchior and Y. Mellier and M. Meneghetti and E. Merlin and G. Meylan and Mohr, \{J. J.\} and M. Moresco and L. Moscardini and R. Nakajima and Nichol, \{R. C.\} and Niemi, \{S. M.\} and C. Padilla and F. Pasian and K. Pedersen and Percival, \{W. J.\} and V. Pettorino and S. Pires and G. Polenta and M. Poncet and Popa, \{L. A.\} and L. Pozzetti and F. Raison and A. Renzi and J. Rhodes and G. Riccio and E. Romelli and M. Roncarelli and E. Rossetti and R. Saglia and D. Sapone and P. Schneider and T. Schrabback and A. Secroun and G. Seidel and S. Serrano and C. Sirignano and G. Sirri and L. Stanco and P. Tallada-Cresp{\'i} and Taylor, \{A. N.\} and Teplitz, \{H. I.\} and I. Tereno and R. Toledo-Moreo and I. Tutusaus and L. Valenziano and T. Vassallo and A. Veropalumbo and Y. Wang and J. Weller and E. Zucca and C. Burigana and G. Castignani and Z. Sakr and V. Scottez and M. Viel and P. Simon and J. Mart{\'i}n-Fleitas and D. Scott",

note = "Publisher Copyright: {\textcopyright} The Authors 2025.",

year = "2025",

doi = "10.1051/0004-6361/202450794",

language = "English",

volume = "697",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Weaver, JR, Taamoli, S, McPartland, CJR, Zalesky, L, Allen, N, Toft, S, Sanders, DB, Atek, H, Bowler, RAA, Stern, D, Conselice, CJ, Mobasher, B, Szapudi, I, Eisenhardt, PRM, Murphree, G, Valdes, I, Ito, K, Belladitta, S, Oesch, PA, Serjeant, S, Mortlock, DJ, Hatch, NA, Kluge, M, Milvang-Jensen, B, Rodighiero, G, Bañados, E, Diego, JM, Gavazzi, R, Congedo, G, Shuntov, M, Dole, H, Rocci, PF, Saifollahi, T, Miluzio, M, Ezziati, M, Hughes, ACN, Cuillandre, JC, Laureijs, R, Paltani, S, Schirmer, M, Stone, C, Aghanim, N, Altieri, B, Amara, A, Andreon, S, Auricchio, N, Baldi, M, Balestra, A, Bardelli, S, Bender, R, Bodendorf, C, Bonino, D, Branchini, E, Brescia, M, Brinchmann, J, Camera, S, Capobianco, V, Carbone, C, Cardone, VF, Carretero, J, Casas, S, Castander, FJ, Castellano, M, Cavuoti, S, Cimatti, A, Conversi, L, Copin, Y, Corcione, L, Courbin, F, Courtois, HM, Da Silva, A, Degaudenzi, H, Di Giorgio, AM, Dinis, J, Douspis, M, Dubath, F, Dupac, X, Ealet, A, Farina, M, Farrens, S, Ferriol, S, Fotopoulou, S, Frailis, M, Franceschi, E, Franzetti, P, Galeotta, S, Gillard, W, Gillis, B, Giocoli, C, Gómez-Alvarez, P, Grazian, A, Grupp, F, Guzzo, L, Haugan, SVH, Hoar, J, Hoekstra, H, Holmes, W, Hook, I, Hormuth, F, Hornstrup, A, Hudelot, P, Jahnke, K, Jhabvala, M, Keihänen, E, Kermiche, S, Kiessling, A, Kitching, T, Kubik, B, Kümmel, M, Kunz, M, Kurki-Suonio, H, Lahav, O, Le Mignant, D, Ligori, S, Lilje, PB, Lindholm, V, Lloro, I, Maino, D, Maiorano, E, Mansutti, O, Marggraf, O, Markovic, K, Martinet, N, Marulli, F, Massey, R, Masters, DC, Maurogordato, S, McCracken, HJ, Medinaceli, E, Mei, S, Melchior, M, Mellier, Y, Meneghetti, M, Merlin, E, Meylan, G, Mohr, JJ, Moresco, M, Moscardini, L, Nakajima, R, Nichol, RC, Niemi, SM, Padilla, C, Pasian, F, Pedersen, K, Percival, WJ, Pettorino, V, Pires, S, Polenta, G, Poncet, M, Popa, LA, Pozzetti, L, Raison, F, Renzi, A, Rhodes, J, Riccio, G, Romelli, E, Roncarelli, M, Rossetti, E, Saglia, R, Sapone, D, Schneider, P, Schrabback, T, Secroun, A, Seidel, G, Serrano, S, Sirignano, C, Sirri, G, Stanco, L, Tallada-Crespí, P, Taylor, AN, Teplitz, HI, Tereno, I, Toledo-Moreo, R, Tutusaus, I, Valenziano, L, Vassallo, T, Veropalumbo, A, Wang, Y, Weller, J, Zucca, E, Burigana, C, Castignani, G, Sakr, Z, Scottez, V, Viel, M, Simon, P, Martín-Fleitas, J & Scott, D 2025, 'Euclid: Early Release Observations – NISP-only sources and the search for luminous z = 6–8 galaxies', Astronomy and Astrophysics, vol. 697, A16. https://doi.org/10.1051/0004-6361/202450794

TY - JOUR

T1 - Euclid

T2 - Early Release Observations – NISP-only sources and the search for luminous z = 6–8 galaxies

AU - Weaver, J. R.

AU - Taamoli, S.

AU - McPartland, C. J.R.

AU - Zalesky, L.

AU - Allen, N.

AU - Toft, S.

AU - Sanders, D. B.

AU - Atek, H.

AU - Bowler, R. A.A.

AU - Stern, D.

AU - Conselice, C. J.

AU - Mobasher, B.

AU - Szapudi, I.

AU - Eisenhardt, P. R.M.

AU - Murphree, G.

AU - Valdes, I.

AU - Ito, K.

AU - Belladitta, S.

AU - Oesch, P. A.

AU - Serjeant, S.

AU - Mortlock, D. J.

AU - Hatch, N. A.

AU - Kluge, M.

AU - Milvang-Jensen, B.

AU - Rodighiero, G.

AU - Bañados, E.

AU - Diego, J. M.

AU - Gavazzi, R.

AU - Congedo, G.

AU - Shuntov, M.

AU - Dole, H.

AU - Rocci, P. F.

AU - Saifollahi, T.

AU - Miluzio, M.

AU - Ezziati, M.

AU - Hughes, A. C.N.

AU - Cuillandre, J. C.

AU - Laureijs, R.

AU - Paltani, S.

AU - Schirmer, M.

AU - Stone, C.

AU - Aghanim, N.

AU - Altieri, B.

AU - Amara, A.

AU - Andreon, S.

AU - Auricchio, N.

AU - Baldi, M.

AU - Balestra, A.

AU - Bardelli, S.

AU - Bender, R.

AU - Bodendorf, C.

AU - Bonino, D.

AU - Branchini, E.

AU - Brescia, M.

AU - Brinchmann, J.

AU - Camera, S.

AU - Capobianco, V.

AU - Carbone, C.

AU - Cardone, V. F.

AU - Carretero, J.

AU - Casas, S.

AU - Castander, F. J.

AU - Castellano, M.

AU - Cavuoti, S.

AU - Cimatti, A.

AU - Conversi, L.

AU - Copin, Y.

AU - Corcione, L.

AU - Courbin, F.

AU - Courtois, H. M.

AU - Da Silva, A.

AU - Degaudenzi, H.

AU - Di Giorgio, A. M.

AU - Dinis, J.

AU - Douspis, M.

AU - Dubath, F.

AU - Dupac, X.

AU - Ealet, A.

AU - Farina, M.

AU - Farrens, S.

AU - Ferriol, S.

AU - Fotopoulou, S.

AU - Frailis, M.

AU - Franceschi, E.

AU - Franzetti, P.

AU - Galeotta, S.

AU - Gillard, W.

AU - Gillis, B.

AU - Giocoli, C.

AU - Gómez-Alvarez, P.

AU - Grazian, A.

AU - Grupp, F.

AU - Guzzo, L.

AU - Haugan, S. V.H.

AU - Hoar, J.

AU - Hoekstra, H.

AU - Holmes, W.

AU - Hook, I.

AU - Hormuth, F.

AU - Hornstrup, A.

AU - Hudelot, P.

AU - Jahnke, K.

AU - Jhabvala, M.

AU - Keihänen, E.

AU - Kermiche, S.

AU - Kiessling, A.

AU - Kitching, T.

AU - Kubik, B.

AU - Kümmel, M.

AU - Kunz, M.

AU - Kurki-Suonio, H.

AU - Lahav, O.

AU - Le Mignant, D.

AU - Ligori, S.

AU - Lilje, P. B.

AU - Lindholm, V.

AU - Lloro, I.

AU - Maino, D.

AU - Maiorano, E.

AU - Mansutti, O.

AU - Marggraf, O.

AU - Markovic, K.

AU - Martinet, N.

AU - Marulli, F.

AU - Massey, R.

AU - Masters, D. C.

AU - Maurogordato, S.

AU - McCracken, H. J.

AU - Medinaceli, E.

AU - Mei, S.

AU - Melchior, M.

AU - Mellier, Y.

AU - Meneghetti, M.

AU - Merlin, E.

AU - Meylan, G.

AU - Mohr, J. J.

AU - Moresco, M.

AU - Moscardini, L.

AU - Nakajima, R.

AU - Nichol, R. C.

AU - Niemi, S. M.

AU - Padilla, C.

AU - Pasian, F.

AU - Pedersen, K.

AU - Percival, W. J.

AU - Pettorino, V.

AU - Pires, S.

AU - Polenta, G.

AU - Poncet, M.

AU - Popa, L. A.

AU - Pozzetti, L.

AU - Raison, F.

AU - Renzi, A.

AU - Rhodes, J.

AU - Riccio, G.

AU - Romelli, E.

AU - Roncarelli, M.

AU - Rossetti, E.

AU - Saglia, R.

AU - Sapone, D.

AU - Schneider, P.

AU - Schrabback, T.

AU - Secroun, A.

AU - Seidel, G.

AU - Serrano, S.

AU - Sirignano, C.

AU - Sirri, G.

AU - Stanco, L.

AU - Tallada-Crespí, P.

AU - Taylor, A. N.

AU - Teplitz, H. I.

AU - Tereno, I.

AU - Toledo-Moreo, R.

AU - Tutusaus, I.

AU - Valenziano, L.

AU - Vassallo, T.

AU - Veropalumbo, A.

AU - Wang, Y.

AU - Weller, J.

AU - Zucca, E.

AU - Burigana, C.

AU - Castignani, G.

AU - Sakr, Z.

AU - Scottez, V.

AU - Viel, M.

AU - Simon, P.

AU - Martín-Fleitas, J.

AU - Scott, D.

PY - 2025

Y1 - 2025

N2 - This paper presents a search for high redshift galaxies from the Euclid Early Release Observations program ‘Magnifying Lens.’ The 1.5 deg2 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 (MUV ≲ -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 YE, JE, and HE NISP detection image, 168 do not have any appreciable VIS/IE 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.

AB - This paper presents a search for high redshift galaxies from the Euclid Early Release Observations program ‘Magnifying Lens.’ The 1.5 deg2 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 (MUV ≲ -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 YE, JE, and HE NISP detection image, 168 do not have any appreciable VIS/IE 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.

KW - Catalogs

KW - Galaxies: evolution

KW - Galaxies: high-redshift

U2 - 10.1051/0004-6361/202450794

DO - 10.1051/0004-6361/202450794

M3 - Journal article

AN - SCOPUS:105004757412

SN - 0004-6361

VL - 697

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A16

ER -

Euclid: Early Release Observations – NISP-only sources and the search for luminous z = 6–8 galaxies

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