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Euclid: Discovery of bright $z\simeq7$ Lyman-break galaxies in UltraVISTA and Euclid COSMOS

Fuente: arXiv

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Detalles Bibliográficos
Autores principales:	Varadaraj, R. G., Bowler, R. A. A., Jarvis, M. J., Weaver, J. R., Bañados, E., Holloway, P., Caputi, K. I., Wilkins, S. M., Yang, D., Milvang-Jensen, B., Gabarra, L., Oesch, P. A., Amara, A., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Bardelli, S., Biviano, A., Branchini, E., Brescia, M., Camera, S., Cañas-Herrera, G., Capobianco, V., Carbone, C., Carretero, J., Castellano, M., Castignani, G., Cavuoti, S., Chambers, K. C., Cimatti, A., Colodro-Conde, C., Congedo, G., Conselice, C. J., Conversi, L., Copin, Y., Courbin, F., Courtois, H. M., Cropper, M., Da Silva, A., Degaudenzi, H., De Lucia, G., Dole, H., Dubath, F., Duncan, C. A. J., Dupac, X., Dusini, S., Escoffier, S., Farina, M., Farinelli, R., Faustini, F., Ferriol, S., Finelli, F., Fosalba, P., Fourmanoit, N., Frailis, M., Franceschi, E., Fumana, M., Galeotta, S., George, K., Gillis, B., Giocoli, C., Gracia-Carpio, J., Grazian, A., Grupp, F., Guzzo, L., Haugan, S. V. H., Hoar, J., Hoekstra, H., Holmes, W., Hook, I. M., Hormuth, F., Hornstrup, A., Jahnke, K., Jhabvala, M., Joachimi, B., Keihänen, E., Kermiche, S., Kiessling, A., Kilbinger, M., Kubik, B., Kümmel, M., Kunz, M., Kurki-Suonio, H., Brun, A. M. C. Le, Ligori, S., Lilje, P. B., Lindholm, V., Lloro, I., Mainetti, G., Maino, D., Maiorano, E., Mansutti, O., Marggraf, O., Martinelli, M., Martinet, N., Marulli, F., Massey, R. J., Medinaceli, E., Mei, S., Melchior, M., Mellier, Y., Meneghetti, M., Merlin, E., Meylan, G., Mora, A., Moresco, M., Moscardini, L., Nakajima, R., Neissner, C., Niemi, S. -M., Padilla, C., Paltani, S., Pasian, F., Pedersen, K., Percival, W. J., Pettorino, V., Pires, S., Polenta, G., Poncet, M., Popa, L. A., Pozzetti, L., Raison, F., Renzi, A., Rhodes, J., Riccio, G., Romelli, E., Roncarelli, M., Rossetti, E., Saglia, R., Sakr, Z., Sapone, D., Sartoris, B., Schirmer, M., Schneider, P., Schrabback, T., Secroun, A., Seidel, G., Serrano, S., Simon, P., Sirignano, C., Sirri, G., Stanco, L., Starck, J. -L., Steinwagner, J., Tallada-Crespí, P., Taylor, A. N., Teplitz, H. I., Tereno, I., Tessore, N., Toft, S., Toledo-Moreo, R., Torradeflot, F., Tutusaus, I., Valenziano, L., Valiviita, J., Vassallo, T., Veropalumbo, A., Wang, Y., Weller, J., Zamorani, G., Zerbi, F. M., Zucca, E., Martín-Fleitas, J., Scottez, V., Viel, M.
Formato:	Preprint
Publicado:	2025
Materias:	Astrophysics of Galaxies
Acceso en línea:	Acceder al recurso
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author	Varadaraj, R. G. Bowler, R. A. A. Jarvis, M. J. Weaver, J. R. Bañados, E. Holloway, P. Caputi, K. I. Wilkins, S. M. Yang, D. Milvang-Jensen, B. Gabarra, L. Oesch, P. A. Amara, A. Andreon, S. Auricchio, N. Baccigalupi, C. Baldi, M. Bardelli, S. Biviano, A. Branchini, E. Brescia, M. Camera, S. Cañas-Herrera, G. Capobianco, V. Carbone, C. Carretero, J. Castellano, M. Castignani, G. Cavuoti, S. Chambers, K. C. Cimatti, A. Colodro-Conde, C. Congedo, G. Conselice, C. J. Conversi, L. Copin, Y. Courbin, F. Courtois, H. M. Cropper, M. Da Silva, A. Degaudenzi, H. De Lucia, G. Dole, H. Dubath, F. Duncan, C. A. J. Dupac, X. Dusini, S. Escoffier, S. Farina, M. Farinelli, R. Faustini, F. Ferriol, S. Finelli, F. Fosalba, P. Fourmanoit, N. Frailis, M. Franceschi, E. Fumana, M. Galeotta, S. George, K. Gillis, B. Giocoli, C. Gracia-Carpio, J. Grazian, A. Grupp, F. Guzzo, L. Haugan, S. V. H. Hoar, J. Hoekstra, H. Holmes, W. Hook, I. M. Hormuth, F. Hornstrup, A. Jahnke, K. Jhabvala, M. Joachimi, B. Keihänen, E. Kermiche, S. Kiessling, A. Kilbinger, M. Kubik, B. Kümmel, M. Kunz, M. Kurki-Suonio, H. Brun, A. M. C. Le Ligori, S. Lilje, P. B. Lindholm, V. Lloro, I. Mainetti, G. Maino, D. Maiorano, E. Mansutti, O. Marggraf, O. Martinelli, M. Martinet, N. Marulli, F. Massey, R. J. Medinaceli, E. Mei, S. Melchior, M. Mellier, Y. Meneghetti, M. Merlin, E. Meylan, G. Mora, A. Moresco, M. Moscardini, L. Nakajima, R. Neissner, C. Niemi, S. -M. Padilla, C. Paltani, S. Pasian, F. Pedersen, K. Percival, W. J. Pettorino, V. Pires, S. Polenta, G. Poncet, M. Popa, L. A. Pozzetti, L. Raison, F. Renzi, A. Rhodes, J. Riccio, G. Romelli, E. Roncarelli, M. Rossetti, E. Saglia, R. Sakr, Z. Sapone, D. Sartoris, B. Schirmer, M. Schneider, P. Schrabback, T. Secroun, A. Seidel, G. Serrano, S. Simon, P. Sirignano, C. Sirri, G. Stanco, L. Starck, J. -L. Steinwagner, J. Tallada-Crespí, P. Taylor, A. N. Teplitz, H. I. Tereno, I. Tessore, N. Toft, S. Toledo-Moreo, R. Torradeflot, F. Tutusaus, I. Valenziano, L. Valiviita, J. Vassallo, T. Veropalumbo, A. Wang, Y. Weller, J. Zamorani, G. Zerbi, F. M. Zucca, E. Martín-Fleitas, J. Scottez, V. Viel, M.
author_facet	Varadaraj, R. G. Bowler, R. A. A. Jarvis, M. J. Weaver, J. R. Bañados, E. Holloway, P. Caputi, K. I. Wilkins, S. M. Yang, D. Milvang-Jensen, B. Gabarra, L. Oesch, P. A. Amara, A. Andreon, S. Auricchio, N. Baccigalupi, C. Baldi, M. Bardelli, S. Biviano, A. Branchini, E. Brescia, M. Camera, S. Cañas-Herrera, G. Capobianco, V. Carbone, C. Carretero, J. Castellano, M. Castignani, G. Cavuoti, S. Chambers, K. C. Cimatti, A. Colodro-Conde, C. Congedo, G. Conselice, C. J. Conversi, L. Copin, Y. Courbin, F. Courtois, H. M. Cropper, M. Da Silva, A. Degaudenzi, H. De Lucia, G. Dole, H. Dubath, F. Duncan, C. A. J. Dupac, X. Dusini, S. Escoffier, S. Farina, M. Farinelli, R. Faustini, F. Ferriol, S. Finelli, F. Fosalba, P. Fourmanoit, N. Frailis, M. Franceschi, E. Fumana, M. Galeotta, S. George, K. Gillis, B. Giocoli, C. Gracia-Carpio, J. Grazian, A. Grupp, F. Guzzo, L. Haugan, S. V. H. Hoar, J. Hoekstra, H. Holmes, W. Hook, I. M. Hormuth, F. Hornstrup, A. Jahnke, K. Jhabvala, M. Joachimi, B. Keihänen, E. Kermiche, S. Kiessling, A. Kilbinger, M. Kubik, B. Kümmel, M. Kunz, M. Kurki-Suonio, H. Brun, A. M. C. Le Ligori, S. Lilje, P. B. Lindholm, V. Lloro, I. Mainetti, G. Maino, D. Maiorano, E. Mansutti, O. Marggraf, O. Martinelli, M. Martinet, N. Marulli, F. Massey, R. J. Medinaceli, E. Mei, S. Melchior, M. Mellier, Y. Meneghetti, M. Merlin, E. Meylan, G. Mora, A. Moresco, M. Moscardini, L. Nakajima, R. Neissner, C. Niemi, S. -M. Padilla, C. Paltani, S. Pasian, F. Pedersen, K. Percival, W. J. Pettorino, V. Pires, S. Polenta, G. Poncet, M. Popa, L. A. Pozzetti, L. Raison, F. Renzi, A. Rhodes, J. Riccio, G. Romelli, E. Roncarelli, M. Rossetti, E. Saglia, R. Sakr, Z. Sapone, D. Sartoris, B. Schirmer, M. Schneider, P. Schrabback, T. Secroun, A. Seidel, G. Serrano, S. Simon, P. Sirignano, C. Sirri, G. Stanco, L. Starck, J. -L. Steinwagner, J. Tallada-Crespí, P. Taylor, A. N. Teplitz, H. I. Tereno, I. Tessore, N. Toft, S. Toledo-Moreo, R. Torradeflot, F. Tutusaus, I. Valenziano, L. Valiviita, J. Vassallo, T. Veropalumbo, A. Wang, Y. Weller, J. Zamorani, G. Zerbi, F. M. Zucca, E. Martín-Fleitas, J. Scottez, V. Viel, M.
contents	We present a search for $z\simeq7$ Lyman-break galaxies using the $1.72 \, \rm{deg}^2$ near-infrared UltraVISTA survey in the COSMOS field, reaching $5\,σ$ depths in $Y$ of 26.2. We incorporate deep optical and Spitzer imaging for a full spectral energy distribution (SED) fitting analysis. We find 289 candidate galaxies at $6.5\leq z \leq 7.5$ covering $-22.6 \leq M_{\rm UV} \leq -20.2$, faint enough to overlap with Hubble Space Telescope studies. We conduct a separate selection by including complementary Euclid performance verification imaging (reaching $5\,σ$ depths of $26.3$), yielding 140 galaxies in $0.65 \, \rm{deg}^2$, with 38 sources unique to this sample. We compute the rest-frame UV luminosity function (UV LF) from our samples, extending below the knee ($M^*=-21.14^{+0.28}_{-0.25}$). We find that the shape of the UV LF is consistent with both a Schechter function and double-power law (DPL) at the magnitudes probed by this sample, with a DPL preferred at $M_{\rm UV}<-22.5$ when bright-end results are included. The UltraVISTA+Euclid sample provides a clean measurement of the LF due to the overlapping near-infrared filters identifying molecular absorption features in the SEDs of ultra-cool dwarf interlopers, and additional faint galaxies are recovered. A comparison with JWST LFs at $z>7$ suggests a gentle evolution in the bright-end slope, although this is limited by a lack of robust bright-end measurements at $z>9$. We forecast that in the Euclid Deep Fields, the removal of contaminant ultra-cool dwarfs as point sources will be possible at $J_{\rm E} < 24.5$. Finally, we present a high-equivalent-width Lyman-$α$ emitter candidate identified by combining HSC, VISTA, and Euclid broadband photometry, highlighting the synergistic power these instruments will have in the Euclid Auxiliary Fields for identifying extreme sources in the Epoch of Reionisation.
format	Preprint
id	arxiv_https___arxiv_org_abs_2510_00945
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Euclid: Discovery of bright $z\simeq7$ Lyman-break galaxies in UltraVISTA and Euclid COSMOS Varadaraj, R. G. Bowler, R. A. A. Jarvis, M. J. Weaver, J. R. Bañados, E. Holloway, P. Caputi, K. I. Wilkins, S. M. Yang, D. Milvang-Jensen, B. Gabarra, L. Oesch, P. A. Amara, A. Andreon, S. Auricchio, N. Baccigalupi, C. Baldi, M. Bardelli, S. Biviano, A. Branchini, E. Brescia, M. Camera, S. Cañas-Herrera, G. Capobianco, V. Carbone, C. Carretero, J. Castellano, M. Castignani, G. Cavuoti, S. Chambers, K. C. Cimatti, A. Colodro-Conde, C. Congedo, G. Conselice, C. J. Conversi, L. Copin, Y. Courbin, F. Courtois, H. M. Cropper, M. Da Silva, A. Degaudenzi, H. De Lucia, G. Dole, H. Dubath, F. Duncan, C. A. J. Dupac, X. Dusini, S. Escoffier, S. Farina, M. Farinelli, R. Faustini, F. Ferriol, S. Finelli, F. Fosalba, P. Fourmanoit, N. Frailis, M. Franceschi, E. Fumana, M. Galeotta, S. George, K. Gillis, B. Giocoli, C. Gracia-Carpio, J. Grazian, A. Grupp, F. Guzzo, L. Haugan, S. V. H. Hoar, J. Hoekstra, H. Holmes, W. Hook, I. M. Hormuth, F. Hornstrup, A. Jahnke, K. Jhabvala, M. Joachimi, B. Keihänen, E. Kermiche, S. Kiessling, A. Kilbinger, M. Kubik, B. Kümmel, M. Kunz, M. Kurki-Suonio, H. Brun, A. M. C. Le Ligori, S. Lilje, P. B. Lindholm, V. Lloro, I. Mainetti, G. Maino, D. Maiorano, E. Mansutti, O. Marggraf, O. Martinelli, M. Martinet, N. Marulli, F. Massey, R. J. Medinaceli, E. Mei, S. Melchior, M. Mellier, Y. Meneghetti, M. Merlin, E. Meylan, G. Mora, A. Moresco, M. Moscardini, L. Nakajima, R. Neissner, C. Niemi, S. -M. Padilla, C. Paltani, S. Pasian, F. Pedersen, K. Percival, W. J. Pettorino, V. Pires, S. Polenta, G. Poncet, M. Popa, L. A. Pozzetti, L. Raison, F. Renzi, A. Rhodes, J. Riccio, G. Romelli, E. Roncarelli, M. Rossetti, E. Saglia, R. Sakr, Z. Sapone, D. Sartoris, B. Schirmer, M. Schneider, P. Schrabback, T. Secroun, A. Seidel, G. Serrano, S. Simon, P. Sirignano, C. Sirri, G. Stanco, L. Starck, J. -L. Steinwagner, J. Tallada-Crespí, P. Taylor, A. N. Teplitz, H. I. Tereno, I. Tessore, N. Toft, S. Toledo-Moreo, R. Torradeflot, F. Tutusaus, I. Valenziano, L. Valiviita, J. Vassallo, T. Veropalumbo, A. Wang, Y. Weller, J. Zamorani, G. Zerbi, F. M. Zucca, E. Martín-Fleitas, J. Scottez, V. Viel, M. Astrophysics of Galaxies We present a search for $z\simeq7$ Lyman-break galaxies using the $1.72 \, \rm{deg}^2$ near-infrared UltraVISTA survey in the COSMOS field, reaching $5\,σ$ depths in $Y$ of 26.2. We incorporate deep optical and Spitzer imaging for a full spectral energy distribution (SED) fitting analysis. We find 289 candidate galaxies at $6.5\leq z \leq 7.5$ covering $-22.6 \leq M_{\rm UV} \leq -20.2$, faint enough to overlap with Hubble Space Telescope studies. We conduct a separate selection by including complementary Euclid performance verification imaging (reaching $5\,σ$ depths of $26.3$), yielding 140 galaxies in $0.65 \, \rm{deg}^2$, with 38 sources unique to this sample. We compute the rest-frame UV luminosity function (UV LF) from our samples, extending below the knee ($M^*=-21.14^{+0.28}_{-0.25}$). We find that the shape of the UV LF is consistent with both a Schechter function and double-power law (DPL) at the magnitudes probed by this sample, with a DPL preferred at $M_{\rm UV}<-22.5$ when bright-end results are included. The UltraVISTA+Euclid sample provides a clean measurement of the LF due to the overlapping near-infrared filters identifying molecular absorption features in the SEDs of ultra-cool dwarf interlopers, and additional faint galaxies are recovered. A comparison with JWST LFs at $z>7$ suggests a gentle evolution in the bright-end slope, although this is limited by a lack of robust bright-end measurements at $z>9$. We forecast that in the Euclid Deep Fields, the removal of contaminant ultra-cool dwarfs as point sources will be possible at $J_{\rm E} < 24.5$. Finally, we present a high-equivalent-width Lyman-$α$ emitter candidate identified by combining HSC, VISTA, and Euclid broadband photometry, highlighting the synergistic power these instruments will have in the Euclid Auxiliary Fields for identifying extreme sources in the Epoch of Reionisation.
title	Euclid: Discovery of bright $z\simeq7$ Lyman-break galaxies in UltraVISTA and Euclid COSMOS
topic	Astrophysics of Galaxies
url	https://arxiv.org/abs/2510.00945