Euclid: discovery of bright z ≃ 7 Lyman-break galaxies in UltraVISTA and Euclid COSMOS
We present a search for <i>z<i/> ≃ 7 Lyman-break galaxies using the 1.72 deg<sup>2<sup/> near-infrared (NIR) UltraVISTA survey in the COSMOS field, reaching 5<i>σ<i/> depths in <i>Y<i/> of 26.2. We incorporated deep <i>Euclid<i/> optical an...
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| Natura: | Article (Journal) |
| Lingua: | inglese |
| Pubblicazione: |
9 March 2026
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| In: |
Astronomy and astrophysics
Year: 2026, Volume: 707, Pages: 1-28 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/202557508 |
| Accesso online: | Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202557508 Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2026/03/aa57508-25/aa57508-25.html |
| Note sull'autore: | R.G. Varadaraj, R. a. A. Bowler, M.J. Jarvis, J.R. Weaver, E. Bañados, P. Holloway, K.I. Caputi, S.M. Wilkins, D. Yang, B. Milvang-Jensen, L. Gabarra, P. A. Oesch, A. Amara, S. Andreon, N. Auricchio, C. Baccigalupi, M. Baldi, S. Bardelli, A. Biviano, E. Branchini, M. Brescia, S. Camera, G. Cañas-Herrera, V. Capobianco, C. Carbone, J. Carretero, M. Castellano, G. Castignani, S. Cavuoti, K.C. Chambers, A. Cimatti, C. Colodro-Conde, G. Congedo, C.J. Conselice, L. Conversi, Y. Copin, F. Courbin, H.M. Courtois, M. Cropper, A. Da Silva, H. Degaudenzi, G. De Lucia, H. Dole, F. Dubath, C. a. J. Duncan, X. Dupac, S. Dusini, S. Escoffier, M. Farina, R. Farinelli, F. Faustini, S. Ferriol, F. Finelli, P. Fosalba, N. Fourmanoit, M. Frailis, E. Franceschi, M. Fumana, S. Galeotta, K. George, B. Gillis, C. Giocoli, J. Gracia-Carpio, A. Grazian, F. Grupp, L. Guzzo, S.V.H. Haugan, J. Hoar, H. Hoekstra, W. Holmes, I.M. Hook, F. Hormuth, A. Hornstrup, K. Jahnke, M. Jhabvala, B. Joachimi, E. Keihänen, S. Kermiche, A. Kiessling, M. Kilbinger, B. Kubik, M. Kümmel, M. Kunz, H. Kurki-Suonio, A. M. C. Le Brun, S. Ligori, P. B. Lilje, V. Lindholm, I. Lloro, G. Mainetti, D. Maino, E. Maiorano, O. Mansutti, O. Marggraf, M. Martinelli, N. Martinet, F. Marulli, R.J. Massey, E. Medinaceli, S. Mei, M. Melchior, Y. Mellier, M. Meneghetti, E. Merlin, G. Meylan, A. Mora, M. Moresco, L. Moscardini, R. Nakajima, C. Neissner, S.-M. Niemi, C. Padilla, S. Paltani, 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, Z. Sakr, D. Sapone, B. Sartoris, M. Schirmer, P. Schneider, T. Schrabback, A. Secroun, G. Seidel, S. Serrano, P. Simon, C. Sirignano, G. Sirri, L. Stanco, J.-L. Starck, J. Steinwagner, P. Tallada-Crespí, A.N. Taylor, H.I. Teplitz, I. Tereno, N. Tessore, S. Toft, R. Toledo-Moreo, F. Torradeflot, I. Tutusaus, L. Valenziano, J. Valiviita, T. Vassallo, A. Veropalumbo, Y. Wang, J. Weller, G. Zamorani, F.M. Zerbi, E. Zucca, J. Martín-Fleitas, V. Scottez, and M. Viel |
| Riassunto: | We present a search for <i>z<i/> ≃ 7 Lyman-break galaxies using the 1.72 deg<sup>2<sup/> near-infrared (NIR) UltraVISTA survey in the COSMOS field, reaching 5<i>σ<i/> depths in <i>Y<i/> of 26.2. We incorporated deep <i>Euclid<i/> optical and <i>Euclid<i/> + <i>Spitzer<i/> NIR imaging for a full spectral energy distribution (SED) fitting analysis. We found 289 candidate galaxies at 6.5 ≤ <i>z<i/> ≤ 7.5 covering −22.6 ≤ <i>M<i/><sub>UV<sub/> ≤ −20.2, faint enough to overlap with <i>Hubble<i/> Space Telescope studies. We conducted a separate selection by including complementary <i>Euclid<i/> performance verification imaging (reaching 5<i>σ<i/> depths of 26.3), yielding 140 galaxies in 0.65 deg<sup>2<sup/>, with 38 sources unique to this sample. We computed the rest-frame UV luminosity function (UV LF) from our samples, extending below the knee ( ). We find that the shape of the UV LF is consistent with both a Schechter function and a double power law (DPL) at the magnitudes probed by this sample, with a DPL preferred at <i>M<i/><sub>UV<sub/> < −22.5 when bright-end results are included. The UltraVISTA + <i>Euclid<i/> sample provides a clean measurement of the LF due to the overlapping NIR filters identifying molecular absorption features in the SEDs of ultra-cool dwarf interlopers, and additional faint galaxies were recovered. A comparison with JWST LFs at <i>z<i/> > 7 suggests a gentle evolution in the bright-end slope, although this is limited by a lack of robust bright-end measurements at <i>z<i/> > 9. We forecast that in the Euclid Deep Fields, the removal of contaminant ultra-cool dwarfs as point sources will be possible at <i>J<i/><sub>E<sub/> < 24.5. Finally, we present a high-equivalent-width Lyman-<i>α<i/> emitter candidate identified by combining HSC, VISTA, and <i>Euclid<i/> broadband photometry, highlighting the synergistic power these instruments will have in the Euclid Auxiliary Fields for identifying extreme sources in the epoch of reionisation. |
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| Descrizione del documento: | Gesehen am 26.08.2026 |
| Descrizione fisica: | Online Resource |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/202557508 |