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EMU and Euclid: Detection of a radio-optical galaxy clustering cross-correlation signal between the Evolutionary Map of the Universe and Euclid

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Main Authors:	Piccirilli, G., Bahr-Kalus, B., Camera, S., Asorey, J., Hale, C. L., Fabbian, G., Asher, A. D., Vai, M., Saraf, C. S., Parkinson, D., Tessore, N., Tanidis, K., Kunz, M., Hopkins, A. M., Vernstrom, T., Regis, M., Brown, M. J. I., Carollo, D., Zafar, T., Norris, R. P., Pace, F., Diego, J. M., Tang, H., Rahman, F., Farrah, D., van Loon, J. Th., Pennock, C. M., Willingham, J., Andreon, S., Baccigalupi, C., Baldi, M., Bardelli, S., Biviano, A., Branchini, E., Brescia, M., Cañas-Herrera, G., Capobianco, V., Carbone, C., Cardone, V. F., Carretero, J., Casas, S., Castellano, M., Castignani, G., Cavuoti, S., Chambers, K. C., Cimatti, A., Colodro-Conde, C., Congedo, G., Conversi, L., Copin, Y., Courbin, F., Courtois, H. M., Cropper, M., Da Silva, A., Degaudenzi, H., De Lucia, G., Dole, H., Douspis, M., Dubath, F., Duncan, C. A. J., Dupac, X., Dusini, S., Escoffier, S., Farina, M., Farinelli, R., Faustini, F., Ferriol, S., Finelli, F., 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., 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., Kurki-Suonio, H., Brun, A. M. C. Le, Ligori, S., Lilje, P. B., Lindholm, V., Lloro, I., Mainetti, G., Maino, D., Mansutti, O., Marcin, S., Marggraf, O., Martinelli, M., Martinet, N., Marulli, F., Massey, R. J., Medinaceli, E., Mei, S., Mellier, Y., Meneghetti, M., Merlin, E., Meylan, G., Mora, A., Moresco, M., Moscardini, L., Nakajima, R., Neissner, C., Nichol, R. C., Niemi, S. -M., Padilla, C., Paech, K., 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., Saglia, R., Sapone, D., Sartoris, B., Schewtschenko, J. A., Schneider, P., Schrabback, T., Secroun, A., Seidel, G., Serrano, S., Simon, P., Sirignano, C., Sirri, G., Mancini, A. Spurio, Stanco, L., Starck, J. -L., Steinwagner, J., Tallada-Crespí, P., Taylor, A. N., Tereno, I., 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., García-Bellido, J., Martín-Fleitas, J., Pezzotta, A., Scottez, V., Viel, M.
Format:	Preprint
Published:	2025
Subjects:	Cosmology and Nongalactic Astrophysics
Online Access:	Acceder al recurso
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author	Piccirilli, G. Bahr-Kalus, B. Camera, S. Asorey, J. Hale, C. L. Fabbian, G. Asher, A. D. Vai, M. Saraf, C. S. Parkinson, D. Tessore, N. Tanidis, K. Kunz, M. Hopkins, A. M. Vernstrom, T. Regis, M. Brown, M. J. I. Carollo, D. Zafar, T. Norris, R. P. Pace, F. Diego, J. M. Tang, H. Rahman, F. Farrah, D. van Loon, J. Th. Pennock, C. M. Willingham, J. Andreon, S. Baccigalupi, C. Baldi, M. Bardelli, S. Biviano, A. Branchini, E. Brescia, M. Cañas-Herrera, G. Capobianco, V. Carbone, C. Cardone, V. F. Carretero, J. Casas, S. Castellano, M. Castignani, G. Cavuoti, S. Chambers, K. C. Cimatti, A. Colodro-Conde, C. Congedo, G. Conversi, L. Copin, Y. Courbin, F. Courtois, H. M. Cropper, M. Da Silva, A. Degaudenzi, H. De Lucia, G. Dole, H. Douspis, M. Dubath, F. Duncan, C. A. J. Dupac, X. Dusini, S. Escoffier, S. Farina, M. Farinelli, R. Faustini, F. Ferriol, S. Finelli, F. 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. 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. Kurki-Suonio, H. Brun, A. M. C. Le Ligori, S. Lilje, P. B. Lindholm, V. Lloro, I. Mainetti, G. Maino, D. Mansutti, O. Marcin, S. Marggraf, O. Martinelli, M. Martinet, N. Marulli, F. Massey, R. J. Medinaceli, E. Mei, S. Mellier, Y. Meneghetti, M. Merlin, E. Meylan, G. Mora, A. Moresco, M. Moscardini, L. Nakajima, R. Neissner, C. Nichol, R. C. Niemi, S. -M. Padilla, C. Paech, K. 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. Saglia, R. Sapone, D. Sartoris, B. Schewtschenko, J. A. Schneider, P. Schrabback, T. Secroun, A. Seidel, G. Serrano, S. Simon, P. Sirignano, C. Sirri, G. Mancini, A. Spurio Stanco, L. Starck, J. -L. Steinwagner, J. Tallada-Crespí, P. Taylor, A. N. Tereno, I. 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. García-Bellido, J. Martín-Fleitas, J. Pezzotta, A. Scottez, V. Viel, M.
author_facet	Piccirilli, G. Bahr-Kalus, B. Camera, S. Asorey, J. Hale, C. L. Fabbian, G. Asher, A. D. Vai, M. Saraf, C. S. Parkinson, D. Tessore, N. Tanidis, K. Kunz, M. Hopkins, A. M. Vernstrom, T. Regis, M. Brown, M. J. I. Carollo, D. Zafar, T. Norris, R. P. Pace, F. Diego, J. M. Tang, H. Rahman, F. Farrah, D. van Loon, J. Th. Pennock, C. M. Willingham, J. Andreon, S. Baccigalupi, C. Baldi, M. Bardelli, S. Biviano, A. Branchini, E. Brescia, M. Cañas-Herrera, G. Capobianco, V. Carbone, C. Cardone, V. F. Carretero, J. Casas, S. Castellano, M. Castignani, G. Cavuoti, S. Chambers, K. C. Cimatti, A. Colodro-Conde, C. Congedo, G. Conversi, L. Copin, Y. Courbin, F. Courtois, H. M. Cropper, M. Da Silva, A. Degaudenzi, H. De Lucia, G. Dole, H. Douspis, M. Dubath, F. Duncan, C. A. J. Dupac, X. Dusini, S. Escoffier, S. Farina, M. Farinelli, R. Faustini, F. Ferriol, S. Finelli, F. 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. 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. Kurki-Suonio, H. Brun, A. M. C. Le Ligori, S. Lilje, P. B. Lindholm, V. Lloro, I. Mainetti, G. Maino, D. Mansutti, O. Marcin, S. Marggraf, O. Martinelli, M. Martinet, N. Marulli, F. Massey, R. J. Medinaceli, E. Mei, S. Mellier, Y. Meneghetti, M. Merlin, E. Meylan, G. Mora, A. Moresco, M. Moscardini, L. Nakajima, R. Neissner, C. Nichol, R. C. Niemi, S. -M. Padilla, C. Paech, K. 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. Saglia, R. Sapone, D. Sartoris, B. Schewtschenko, J. A. Schneider, P. Schrabback, T. Secroun, A. Seidel, G. Serrano, S. Simon, P. Sirignano, C. Sirri, G. Mancini, A. Spurio Stanco, L. Starck, J. -L. Steinwagner, J. Tallada-Crespí, P. Taylor, A. N. Tereno, I. 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. García-Bellido, J. Martín-Fleitas, J. Pezzotta, A. Scottez, V. Viel, M.
contents	Synergies between large-scale radio-continuum and optical/near-infrared galaxy surveys are a powerful tool for cosmology. Cross-correlating these surveys can constrain the redshift distribution of radio sources, mitigate systematic effects, and place constraints on cosmological models. We perform the first measurement of the clustering cross-spectrum between radio-continuum sources in the Evolutionary Map of the Universe (EMU) survey and galaxies from the ESA Euclid satellite mission's Q1 release. Our goal is to detect and characterise the cross-correlation signal, test its robustness against systematic effects, and compare our measurements with theoretical predictions. We use data from the Australian SKA Pathfinder's EMU Main Survey, which overlaps with the Euclid Deep Field South. We generate two radio-source catalogues using different source finders to create galaxy maps. We measure the harmonic-space cross-correlation signal using a pseudo-spectrum estimator. The measured signal is compared to theoretical predictions based on a ΛCDM cosmology, using several models for the EMU source redshift distribution and bias. We report detection above 8σ of the cross-correlation signal consistent across all tested models and data sets. The measured cross-spectra from the two radio catalogues are in excellent agreement, demonstrating that the cross-correlation is robust against the choice of source-finding algorithm. The measured signal also agrees with theoretical models developed from previous cross-correlation studies and simulations. This pathfinder study establishes a statistically significant cross-correlation between EMU and Euclid. The robustness of the signal is a crucial validation of the methodology, paving the way for future large-scale analyses leveraging the full power of this synergy to constrain cosmological parameters and our understanding of galaxy evolution.
format	Preprint
id	arxiv_https___arxiv_org_abs_2511_22732
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	EMU and Euclid: Detection of a radio-optical galaxy clustering cross-correlation signal between the Evolutionary Map of the Universe and Euclid Piccirilli, G. Bahr-Kalus, B. Camera, S. Asorey, J. Hale, C. L. Fabbian, G. Asher, A. D. Vai, M. Saraf, C. S. Parkinson, D. Tessore, N. Tanidis, K. Kunz, M. Hopkins, A. M. Vernstrom, T. Regis, M. Brown, M. J. I. Carollo, D. Zafar, T. Norris, R. P. Pace, F. Diego, J. M. Tang, H. Rahman, F. Farrah, D. van Loon, J. Th. Pennock, C. M. Willingham, J. Andreon, S. Baccigalupi, C. Baldi, M. Bardelli, S. Biviano, A. Branchini, E. Brescia, M. Cañas-Herrera, G. Capobianco, V. Carbone, C. Cardone, V. F. Carretero, J. Casas, S. Castellano, M. Castignani, G. Cavuoti, S. Chambers, K. C. Cimatti, A. Colodro-Conde, C. Congedo, G. Conversi, L. Copin, Y. Courbin, F. Courtois, H. M. Cropper, M. Da Silva, A. Degaudenzi, H. De Lucia, G. Dole, H. Douspis, M. Dubath, F. Duncan, C. A. J. Dupac, X. Dusini, S. Escoffier, S. Farina, M. Farinelli, R. Faustini, F. Ferriol, S. Finelli, F. 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. 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. Kurki-Suonio, H. Brun, A. M. C. Le Ligori, S. Lilje, P. B. Lindholm, V. Lloro, I. Mainetti, G. Maino, D. Mansutti, O. Marcin, S. Marggraf, O. Martinelli, M. Martinet, N. Marulli, F. Massey, R. J. Medinaceli, E. Mei, S. Mellier, Y. Meneghetti, M. Merlin, E. Meylan, G. Mora, A. Moresco, M. Moscardini, L. Nakajima, R. Neissner, C. Nichol, R. C. Niemi, S. -M. Padilla, C. Paech, K. 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. Saglia, R. Sapone, D. Sartoris, B. Schewtschenko, J. A. Schneider, P. Schrabback, T. Secroun, A. Seidel, G. Serrano, S. Simon, P. Sirignano, C. Sirri, G. Mancini, A. Spurio Stanco, L. Starck, J. -L. Steinwagner, J. Tallada-Crespí, P. Taylor, A. N. Tereno, I. 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. García-Bellido, J. Martín-Fleitas, J. Pezzotta, A. Scottez, V. Viel, M. Cosmology and Nongalactic Astrophysics Synergies between large-scale radio-continuum and optical/near-infrared galaxy surveys are a powerful tool for cosmology. Cross-correlating these surveys can constrain the redshift distribution of radio sources, mitigate systematic effects, and place constraints on cosmological models. We perform the first measurement of the clustering cross-spectrum between radio-continuum sources in the Evolutionary Map of the Universe (EMU) survey and galaxies from the ESA Euclid satellite mission's Q1 release. Our goal is to detect and characterise the cross-correlation signal, test its robustness against systematic effects, and compare our measurements with theoretical predictions. We use data from the Australian SKA Pathfinder's EMU Main Survey, which overlaps with the Euclid Deep Field South. We generate two radio-source catalogues using different source finders to create galaxy maps. We measure the harmonic-space cross-correlation signal using a pseudo-spectrum estimator. The measured signal is compared to theoretical predictions based on a ΛCDM cosmology, using several models for the EMU source redshift distribution and bias. We report detection above 8σ of the cross-correlation signal consistent across all tested models and data sets. The measured cross-spectra from the two radio catalogues are in excellent agreement, demonstrating that the cross-correlation is robust against the choice of source-finding algorithm. The measured signal also agrees with theoretical models developed from previous cross-correlation studies and simulations. This pathfinder study establishes a statistically significant cross-correlation between EMU and Euclid. The robustness of the signal is a crucial validation of the methodology, paving the way for future large-scale analyses leveraging the full power of this synergy to constrain cosmological parameters and our understanding of galaxy evolution.
title	EMU and Euclid: Detection of a radio-optical galaxy clustering cross-correlation signal between the Evolutionary Map of the Universe and Euclid
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2511.22732