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Euclid: Photometric redshift calibration with self-organising maps

Fuente: arXiv

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Detalles Bibliográficos
Autores principales:	Roster, W., Wright, A. H., Hildebrandt, H., Reischke, R., Ilbert, O., D., W. d'Assignies, Manera, M., Bolzonella, M., Masters, D. C., Paltani, S., Hartley, W. G., Kang, Y., Hoekstra, H., Altieri, B., Amara, A., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Balestra, A., Bardelli, S., Battaglia, P., Bender, R., Biviano, A., Branchini, E., Brescia, M., Camera, S., Cañas-Herrera, G., Capobianco, V., Carbone, C., Cardone, V. F., Carretero, J., Casas, R., Casas, S., Castander, F. J., Castellano, M., Castignani, G., Cavuoti, S., Chambers, K. C., Cimatti, A., Colodro-Conde, C., Congedo, G., Conselice, C. J., Conversi, L., Copin, Y., Costille, A., Courbin, F., Courtois, H. M., Cropper, M., Da Silva, A., Degaudenzi, H., de la Torre, S., De Lucia, G., Dubath, F., Duncan, C. A. J., Dupac, X., Dusini, S., Escoffier, S., Farina, M., Farinelli, R., Farrens, S., Faustini, F., Ferriol, S., Finelli, F., Fosalba, P., Fourmanoit, N., Frailis, M., Franceschi, E., Fumana, M., Galeotta, S., George, K., Gillard, W., Gillis, B., Giocoli, C., Gracia-Carpio, J., Grazian, A., Grupp, F., Haugan, S. V. H., Holmes, W., Hormuth, F., Hornstrup, A., Hudelot, P., Jahnke, K., Jhabvala, M., Joachimi, B., Keihänen, E., Kermiche, S., Kubik, B., Kurki-Suonio, H., Brun, A. M. C. Le, Mignant, D. Le, Ligori, S., Lilje, P. B., Lindholm, V., Lloro, I., 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., Pasian, F., Pedersen, K., Pettorino, V., Pires, S., Polenta, G., Poncet, M., Popa, L. A., Pozzetti, L., Raison, F., Rebolo, R., Renzi, A., Rhodes, J., Riccio, G., Romelli, E., Roncarelli, M., Rosset, C., Rossetti, E., Saglia, R., Sakr, Z., Sapone, D., Sartoris, B., Schirmer, M., Schneider, P., Schrabback, T., Scodeggio, M., Secroun, A., Sefusatti, E., Seidel, G., Serrano, S., Simon, P., Sirignano, C., Sirri, G., Skottfelt, J., Stanco, 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., Kleijn, G. Verdoes, Veropalumbo, A., Wang, Y., Weller, J., Zamorani, G., Zerbi, F. M., Zucca, E., Burigana, C., Gabarra, L., Porciani, C., Scottez, V., Sereno, M.
Formato:	Preprint
Publicado:	2025
Materias:	Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies
Acceso en línea:	Acceder al recurso
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author	Roster, W. Wright, A. H. Hildebrandt, H. Reischke, R. Ilbert, O. D., W. d'Assignies Manera, M. Bolzonella, M. Masters, D. C. Paltani, S. Hartley, W. G. Kang, Y. Hoekstra, H. Altieri, B. Amara, A. Andreon, S. Auricchio, N. Baccigalupi, C. Baldi, M. Balestra, A. Bardelli, S. Battaglia, P. Bender, R. Biviano, A. Branchini, E. Brescia, M. Camera, S. Cañas-Herrera, G. Capobianco, V. Carbone, C. Cardone, V. F. Carretero, J. Casas, R. Casas, S. Castander, F. J. Castellano, M. Castignani, G. Cavuoti, S. Chambers, K. C. Cimatti, A. Colodro-Conde, C. Congedo, G. Conselice, C. J. Conversi, L. Copin, Y. Costille, A. Courbin, F. Courtois, H. M. Cropper, M. Da Silva, A. Degaudenzi, H. de la Torre, S. De Lucia, G. Dubath, F. Duncan, C. A. J. Dupac, X. Dusini, S. Escoffier, S. Farina, M. Farinelli, R. Farrens, S. Faustini, F. Ferriol, S. Finelli, F. Fosalba, P. Fourmanoit, N. Frailis, M. Franceschi, E. Fumana, M. Galeotta, S. George, K. Gillard, W. Gillis, B. Giocoli, C. Gracia-Carpio, J. Grazian, A. Grupp, F. Haugan, S. V. H. Holmes, W. Hormuth, F. Hornstrup, A. Hudelot, P. Jahnke, K. Jhabvala, M. Joachimi, B. Keihänen, E. Kermiche, S. Kubik, B. Kurki-Suonio, H. Brun, A. M. C. Le Mignant, D. Le Ligori, S. Lilje, P. B. Lindholm, V. Lloro, I. 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. Pasian, F. Pedersen, K. Pettorino, V. Pires, S. Polenta, G. Poncet, M. Popa, L. A. Pozzetti, L. Raison, F. Rebolo, R. Renzi, A. Rhodes, J. Riccio, G. Romelli, E. Roncarelli, M. Rosset, C. Rossetti, E. Saglia, R. Sakr, Z. Sapone, D. Sartoris, B. Schirmer, M. Schneider, P. Schrabback, T. Scodeggio, M. Secroun, A. Sefusatti, E. Seidel, G. Serrano, S. Simon, P. Sirignano, C. Sirri, G. Skottfelt, J. Stanco, 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. Kleijn, G. Verdoes Veropalumbo, A. Wang, Y. Weller, J. Zamorani, G. Zerbi, F. M. Zucca, E. Burigana, C. Gabarra, L. Porciani, C. Scottez, V. Sereno, M.
author_facet	Roster, W. Wright, A. H. Hildebrandt, H. Reischke, R. Ilbert, O. D., W. d'Assignies Manera, M. Bolzonella, M. Masters, D. C. Paltani, S. Hartley, W. G. Kang, Y. Hoekstra, H. Altieri, B. Amara, A. Andreon, S. Auricchio, N. Baccigalupi, C. Baldi, M. Balestra, A. Bardelli, S. Battaglia, P. Bender, R. Biviano, A. Branchini, E. Brescia, M. Camera, S. Cañas-Herrera, G. Capobianco, V. Carbone, C. Cardone, V. F. Carretero, J. Casas, R. Casas, S. Castander, F. J. Castellano, M. Castignani, G. Cavuoti, S. Chambers, K. C. Cimatti, A. Colodro-Conde, C. Congedo, G. Conselice, C. J. Conversi, L. Copin, Y. Costille, A. Courbin, F. Courtois, H. M. Cropper, M. Da Silva, A. Degaudenzi, H. de la Torre, S. De Lucia, G. Dubath, F. Duncan, C. A. J. Dupac, X. Dusini, S. Escoffier, S. Farina, M. Farinelli, R. Farrens, S. Faustini, F. Ferriol, S. Finelli, F. Fosalba, P. Fourmanoit, N. Frailis, M. Franceschi, E. Fumana, M. Galeotta, S. George, K. Gillard, W. Gillis, B. Giocoli, C. Gracia-Carpio, J. Grazian, A. Grupp, F. Haugan, S. V. H. Holmes, W. Hormuth, F. Hornstrup, A. Hudelot, P. Jahnke, K. Jhabvala, M. Joachimi, B. Keihänen, E. Kermiche, S. Kubik, B. Kurki-Suonio, H. Brun, A. M. C. Le Mignant, D. Le Ligori, S. Lilje, P. B. Lindholm, V. Lloro, I. 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. Pasian, F. Pedersen, K. Pettorino, V. Pires, S. Polenta, G. Poncet, M. Popa, L. A. Pozzetti, L. Raison, F. Rebolo, R. Renzi, A. Rhodes, J. Riccio, G. Romelli, E. Roncarelli, M. Rosset, C. Rossetti, E. Saglia, R. Sakr, Z. Sapone, D. Sartoris, B. Schirmer, M. Schneider, P. Schrabback, T. Scodeggio, M. Secroun, A. Sefusatti, E. Seidel, G. Serrano, S. Simon, P. Sirignano, C. Sirri, G. Skottfelt, J. Stanco, 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. Kleijn, G. Verdoes Veropalumbo, A. Wang, Y. Weller, J. Zamorani, G. Zerbi, F. M. Zucca, E. Burigana, C. Gabarra, L. Porciani, C. Scottez, V. Sereno, M.
contents	The Euclid survey aims to trace the evolution of cosmic structures up to redshift $z$ $\sim$ 3 and beyond. Its success depends critically on obtaining highly accurate mean redshifts for ensembles of galaxies $n(z)$ in all tomographic bins, essential for deriving robust cosmological constraints. However, photometric redshifts (photo-$z$s) suffer from systematic biases arising from various sources of uncertainty. To address these challenges, we utilised self-organising maps (SOMs) with mock samples resembling the Euclid Wide Survey (EWS), to validate Euclid's uncertainty requirement of $\|Δ\langle z \rangle\| = \langle z_{\text{est}} \rangle - \langle z \rangle \leq 0.002 (1+z)$ per tomographic bin, assuming DR3-level data. We observe that defining the redshift tomography using the mean spectroscopic redshift (spec-$z$) per SOM cell, results in none of the ten tomographic redshift bins satisfying the requirement. In contrast, the redshift tomography on the photo-$z$s of the EWS-like sample yields superior results, with eight out of ten bins [$0 < z\leq 2.5$] meeting the Euclid requirement. To enhance the realism of our study, we morph our calibration sample to mimic the C3R2 survey in incremental steps. In this context, a maximum of six out of ten bins meet the requirement, strongly advocating the adoption of a redshift tomography defined by the photo-$z$s of individual galaxies rather than the commonly used mean spec-$z$ of SOM cells. To examine the impact on the expected biases for $Ω_{\text{m}}$, $σ_{8}$, and $Δw_{0}$ measured by Euclid, we perform a Fisher forecast for cosmic shear only, based on our redshift uncertainties. Here, we find that even under an evaluation of the uncertainty where the impact of the redshift bias is substantial, most absolute biases remain below 0.1$σ$ in the idealised scenario and below 0.3$σ$ in the more realistic case.
format	Preprint
id	arxiv_https___arxiv_org_abs_2508_02779
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Euclid: Photometric redshift calibration with self-organising maps Roster, W. Wright, A. H. Hildebrandt, H. Reischke, R. Ilbert, O. D., W. d'Assignies Manera, M. Bolzonella, M. Masters, D. C. Paltani, S. Hartley, W. G. Kang, Y. Hoekstra, H. Altieri, B. Amara, A. Andreon, S. Auricchio, N. Baccigalupi, C. Baldi, M. Balestra, A. Bardelli, S. Battaglia, P. Bender, R. Biviano, A. Branchini, E. Brescia, M. Camera, S. Cañas-Herrera, G. Capobianco, V. Carbone, C. Cardone, V. F. Carretero, J. Casas, R. Casas, S. Castander, F. J. Castellano, M. Castignani, G. Cavuoti, S. Chambers, K. C. Cimatti, A. Colodro-Conde, C. Congedo, G. Conselice, C. J. Conversi, L. Copin, Y. Costille, A. Courbin, F. Courtois, H. M. Cropper, M. Da Silva, A. Degaudenzi, H. de la Torre, S. De Lucia, G. Dubath, F. Duncan, C. A. J. Dupac, X. Dusini, S. Escoffier, S. Farina, M. Farinelli, R. Farrens, S. Faustini, F. Ferriol, S. Finelli, F. Fosalba, P. Fourmanoit, N. Frailis, M. Franceschi, E. Fumana, M. Galeotta, S. George, K. Gillard, W. Gillis, B. Giocoli, C. Gracia-Carpio, J. Grazian, A. Grupp, F. Haugan, S. V. H. Holmes, W. Hormuth, F. Hornstrup, A. Hudelot, P. Jahnke, K. Jhabvala, M. Joachimi, B. Keihänen, E. Kermiche, S. Kubik, B. Kurki-Suonio, H. Brun, A. M. C. Le Mignant, D. Le Ligori, S. Lilje, P. B. Lindholm, V. Lloro, I. 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. Pasian, F. Pedersen, K. Pettorino, V. Pires, S. Polenta, G. Poncet, M. Popa, L. A. Pozzetti, L. Raison, F. Rebolo, R. Renzi, A. Rhodes, J. Riccio, G. Romelli, E. Roncarelli, M. Rosset, C. Rossetti, E. Saglia, R. Sakr, Z. Sapone, D. Sartoris, B. Schirmer, M. Schneider, P. Schrabback, T. Scodeggio, M. Secroun, A. Sefusatti, E. Seidel, G. Serrano, S. Simon, P. Sirignano, C. Sirri, G. Skottfelt, J. Stanco, 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. Kleijn, G. Verdoes Veropalumbo, A. Wang, Y. Weller, J. Zamorani, G. Zerbi, F. M. Zucca, E. Burigana, C. Gabarra, L. Porciani, C. Scottez, V. Sereno, M. Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies The Euclid survey aims to trace the evolution of cosmic structures up to redshift $z$ $\sim$ 3 and beyond. Its success depends critically on obtaining highly accurate mean redshifts for ensembles of galaxies $n(z)$ in all tomographic bins, essential for deriving robust cosmological constraints. However, photometric redshifts (photo-$z$s) suffer from systematic biases arising from various sources of uncertainty. To address these challenges, we utilised self-organising maps (SOMs) with mock samples resembling the Euclid Wide Survey (EWS), to validate Euclid's uncertainty requirement of $\|Δ\langle z \rangle\| = \langle z_{\text{est}} \rangle - \langle z \rangle \leq 0.002 (1+z)$ per tomographic bin, assuming DR3-level data. We observe that defining the redshift tomography using the mean spectroscopic redshift (spec-$z$) per SOM cell, results in none of the ten tomographic redshift bins satisfying the requirement. In contrast, the redshift tomography on the photo-$z$s of the EWS-like sample yields superior results, with eight out of ten bins [$0 < z\leq 2.5$] meeting the Euclid requirement. To enhance the realism of our study, we morph our calibration sample to mimic the C3R2 survey in incremental steps. In this context, a maximum of six out of ten bins meet the requirement, strongly advocating the adoption of a redshift tomography defined by the photo-$z$s of individual galaxies rather than the commonly used mean spec-$z$ of SOM cells. To examine the impact on the expected biases for $Ω_{\text{m}}$, $σ_{8}$, and $Δw_{0}$ measured by Euclid, we perform a Fisher forecast for cosmic shear only, based on our redshift uncertainties. Here, we find that even under an evaluation of the uncertainty where the impact of the redshift bias is substantial, most absolute biases remain below 0.1$σ$ in the idealised scenario and below 0.3$σ$ in the more realistic case.
title	Euclid: Photometric redshift calibration with self-organising maps
topic	Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies
url	https://arxiv.org/abs/2508.02779