Euclid Quick Data Release (Q1)
Year: 2026
Type: article
Abstract: We present and investigate the properties of a sample of radio-selected, Euclid -dark galaxies, identified from LOFAR HBA observations at 144 MHz within the Euclid Deep Field-North (EDF-N), covering approximately 10 deg 2 . Starting from 1051 radio sources lacking optical counterparts down to a 5σ depth of 23.9 in the y band in previous surveys (but detected with Spitzer /IRAC), we identified 166 galaxies with no emission at a depth of more than 3σ from Euclid Quick Release 1 (Q1) images, reaching a 5σ depth of 23.9 in the H E band, and no matches in the Euclid Q1 catalogue. To minimise contamination from nearby sources, we selected a sub-sample of 88 isolated galaxies. By exploiting multi-band images and catalogues available for the EDF-N, we inferred the physical properties of our sample via SED fitting. The resulting redshift distribution spans 0.4 ≤ z ph ≤ 5.0. We made use of recent sub-arcsecond imaging from the International LOFAR Telescope over an area of 2.5 deg × 2.5 deg to constrain the nature of the compact radio emission in our targets through brightness-temperature estimates. By combining this information with the radio excess relative to the infrared/radio-correlation (IRRC), we searched for possible active galactic nucleus (AGN) activity in our sample. Approximately 30% of our sources show a radio excess relative to star formation. This fraction increases to 40% when including AGNs identified via their brightness temperature. The Euclid -dark sources detected in the far-infrared (FIR) are consistent with a population of heavily obscured (⟨ A V ISM ⟩ = 5.0) massive (⟨log 10 ( M ⋆ / M ⊙ )⟩ = 11.6) star forming galaxies (SFGs) with high star formation rates (⟨log 10 (SFR/ M ⊙ yr −1 )⟩ = 3.3). Their location above the star-forming main sequence is consistent with the high-mass and high-SFR end of similar near-infrared (NIR)-dark galaxy populations selected at higher radio frequencies reported in the literature. We performed a UV-to-radio median stacking analysis, dividing the sources with LOFAR ILT imaging according to the presence of radio excess. Both sub-samples are detected in the H E band at 3σ and 9σ for the radio-excess and non–radio-excess sources, respectively. The two stacked populations exhibit similar global physical properties and differ primarily in their radio emission, with values consistent with those observed for individual sources, albeit with less extreme SFRs. These preliminary results indicate that, compared to similar selections carried out over smaller fields, the wide area covered by Euclid enables the identification of a higher fraction of systems in which intense star formation and AGN activity coexist, likely capturing a key phase of galaxy–black hole co-evolution.
Source: Astronomy and Astrophysics
Authors: M. Giulietti, I. Prandoni, L. Bisigello, G. Rodighiero, M. Talia, F. Gentile, G. Girardi, M. Bondi, L. Wang, A. La Marca, P. A. C. Cunha, R. Hill, A. Abghari, D. Scott, G. Zamorani, G. A. Mamon, A. Lapi, M. Behiri, G. Santhosh, H. J. A. Rottgering, R. Gilli, R. Scaramella, G. Gandolfi, S. Andreon, N. Auricchio, C. Baccigalupi, M. Baldi, A. Balestra, S. Bardelli, P. Battaglia, A. Biviano, M. Bolzonella, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, G. Cañas-Herrera, V. Capobianco, C. Carbone, J. Carretero, S. Casas, M. Castellano, G. Castignani, S. Cavuoti, K. C. Chambers, A. Cimatti, C. Colodro-Conde, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, A. Costille, F. Courbin, H. M. Courtois, M. Cropper, A. Da Silva, H. Degaudenzi, G. De Lucia, C. Dolding, H. Dole, F. Dubath, C. A. J. Duncan, X. Dupac, S. Dusini, S. Escoffier, M. Farina, R. Farinelli, F. Faustini, S. Ferriol, F. Finelli, S. Fotopoulou, M. Frailis, E. Franceschi, M. Fumana, L. Gabarra, S. Galeotta, K. George, B. Gillis, C. Giocoli, J. Gracia-Carpio, A. Grazian, F. Grupp, S. Gwyn, W. G. Hartley, S. V. H. Haugan, S. Hemmati, J. Hoar, W. Holmes, 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, M. Magliocchetti, G. Mainetti, D. Maino, E. Maiorano, O. Mansutti, S. Marcin, O. Marggraf, M. Martinelli, N. Martinet, F. Marulli, R. J. Massey, N. Mauri, E. Medinaceli, S. Mei, Y. Mellier, M. Meneghetti, E. Merlin, G. Meylan, P. Monaco, A. Mora, M. Moresco, C. Moretti, L. Moscardini, R. Nakajima, C. Neissner, R. C. Nichol, S.-M. Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W. J. Percival, V. Pettorino, A. Pezzotta, S. Pires, G. Polenta, M. Poncet, L. A. Popa, C. Porciani, L. Pozzetti, F. Raison, A. Renzi, J. Rhodes, G. Riccio, I. Risso, E. Romelli, M. Roncarelli, R. Saglia, Z. Sakr, D. Sapone, B. Sartoris, J. A. Schewtschenko, 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, A. Zacchei, E. Zucca, V. Allevato, M. Ballardini, E. Bozzo, C. Burigana, R. Cabanac, M. Calabrese, A. Cappi, J. A. Escartin Vigo, R. Maoli, J. Martín-Fleitas, S. Matthew, M. Maturi, R. B. Metcalf, M. Pöntinen, V. Scottez, M. Sereno, M. Tenti, M. Viel, M. Wiesmann, Y. Akrami, I. T. Andika, S. Anselmi, M. Archidiacono, F. Atrio-Barandela, D. Bertacca, M. Bethermin, A. Blanchard, L. Blot, M. Bonici, S. Borgani, M. L. Brown, S. Bruton, A. Calabro, B. Camacho Quevedo, F. Caro, C. S. Carvalho, T. Castro, F. Cogato, S. Conseil, A. R. Cooray, O. Cucciati, S. Davini, G. Desprez, A. Díaz-Sánchez, J. J. Diaz, S. Di Domizio, J. M. Diego, M. Y. Elkhashab, A. Enia, Y. Fang, A. Finoguenov, A. Franco, K. Ganga, J. García-Bellido, T. Gasparetto, V. Gautard, E. Gaztanaga, F. Giacomini, F. Gianotti, G. Gozaliasl, M. Guidi, C. M. Gutierrez, A. Hall, C. Hernández-Monteagudo, H. Hildebrandt, J. Hjorth, J. J. E. Kajava, Y. Kang, V. Kansal, D. Karagiannis, K. Kiiveri, J. Kim, C. C. Kirkpatrick, S. Kruk, L. Legrand, M. Lembo, F. Lepori, G. F. Lesci, J. Lesgourgues, L. Leuzzi, T. I. Liaudat, A. Loureiro, J. Macias-Perez, F. Mannucci, C. J. A. P. Martins, L. Maurin, M. Miluzio, G. Morgante, K. Naidoo, P. Natoli, A. Navarro-Alsina, S. Nesseris, D. Paoletti, F. Passalacqua, K. Paterson, L. Patrizii, A. Pisani, D. Potter, S. Quai, M. Radovich, S. Sacquegna, M. Sahlén, D. B. Sanders, E. Sarpa, A. Schneider, D. Sciotti, E. Sellentin, F. Shankar, A. Shulevski, L. C. Smith, J. G. Sorce, K. Tanidis, C. Tao, G. Testera, R. Teyssier, S. Tosi, A. Troja, M. Tucci, A. Venhola, D. Vergani, G. Verza, P. Vielzeuf, N. A. Walton
Institutions: Istituto di Radioastronomia di Bologna, National Institute for Astrophysics, Osservatorio Astronomico di Padova, University of Padua, Osservatorio di Astrofisica e Scienza dello Spazio, University of Bologna, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CEA Paris-Saclay - Etablissement de Saclay, CEA Paris-Saclay, Institut de Recherche sur les Lois Fondamentales de l'Univers, University of Groningen, Space Research Organisation Netherlands, European Space Agency, European Space Research and Technology Centre, University of British Columbia, Institut d'Astrophysique de Paris, Scuola Internazionale Superiore di Studi Avanzati, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Institute for Fundamental Physics of the Universe, Leiden University, Leiden Observatory, Astronomical Observatory of Rome, Brera Astronomical Observatory, Trieste Astronomical Observatory, Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Istituto Nazionale di Fisica Nucleare, Sezione di Genova, University of Genoa, Astronomical Observatory of Capodimonte, University of Naples Federico II, European Southern Observatory, Universidade do Porto, Institute of Astrophysics and Space Sciences, Centro de Astrofísica da Universidade do Porto, European Southern Observatory, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Osservatorio Astrofisico di Torino, University of Turin, Universitat Autònoma de Barcelona, Port d'Informació Científica, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR), RWTH Aachen University, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, University of Hawaiʻi at Mānoa, University of Hawaii System, Instituto de Astrofísica de Canarias, Royal Observatory, University of Edinburgh, University of Manchester, European Space Astronomy Centre, European Space Research Institute, Lyon 1 Université, Centre National de la Recherche Scientifique, Aix-Marseille Université, Institució Catalana de Recerca i Estudis Avançats, Institute of Space Sciences, Consejo Superior de Investigaciones Científicas, Institut de Ciències del Cosmos, Universitat de Barcelona, Lyon College, University College London, University of Lisbon, University of Geneva, Université Paris-Saclay, Institut d'Astrophysique Spatiale, Istituto Nazionale di Fisica Nucleare, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Institute for Space Astrophysics and Planetology, Agenzia Spaziale Italiana, University of Bristol, University of Oxford, Ludwig-Maximilians-Universität München, Max Planck Institute for Extraterrestrial Physics, Herzberg Institute of Astrophysics, University of Oslo, California Institute of Technology, Infrared Processing and Analysis Center, Jet Propulsion Laboratory, Technical University of Denmark, Max Planck Institute for Astronomy, Goddard Space Flight Center, Helsinki Institute of Physics, Université Paris Cité, Astrophysique, Instrumentation et Modélisation, Université Paris Sciences et Lettres, Observatoire de Paris, Sorbonne Université, Laboratoire d'Étude de l'Univers et des Phénomènes Extrêmes, SKA Observatory, Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules, University of Milan, Istituto Nazionale di Fisica Nucleare, Sezione di Milano, FHNW University of Applied Sciences and Arts Northwestern Switzerland, University of Bonn, Istituto Nazionale di Fisica Nucleare, Sezione di Roma I, Durham University, Centre Pierre Binétruy, University of California, Berkeley, École Polytechnique Fédérale de Lausanne, University of Trieste, Institute for High Energy Physics, Barcelona Institute of Science and Technology, University of Surrey, University of Copenhagen, University of Waterloo, Perimeter Institute, Centre National d'Études Spatiales, Institute of Space Science - INFLPR Subsidiary, Université Toulouse III - Paul Sabatier, Saint Joseph University, Heidelberg University, Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, University of Chile, Universität Innsbruck, Institut d'Estudis Espacials de Catalunya, Universitat Politècnica de Catalunya, Universidad Politécnica de Cartagena, University of Ferrara, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara, Osservatorio Astronomico della Regione Autonoma Valle d'Aosta, Regione Autonoma Valle d'Aosta, Université Côte d'Azur, Lagrange Laboratory, Observatoire de la Côte d’Azur, Sapienza University of Rome, Université Catholique de Lille, Fondazione ICSC Centro Nazionale di Ricerca in High Performance Computing, Big Data e Quantum Computing, Instituto de Física Teórica, Case Western Reserve University, Max Planck Institute for Astrophysics, Technical University of Munich, Laboratoire Univers et Théories, Universidad de Salamanca, Observatoire astronomique de Strasbourg, Université de Strasbourg, Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo, University of California, Irvine, Instituto de Física de Cantabria, University of Salento, Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, University of Portsmouth, Aalto University, Universidad de La Laguna, Ruhr University Bochum, ARC Centre of Excellence for Dark Matter Particle Physics, Swinburne University of Technology, University of the Western Cape, University of Cambridge, University of Zurich, Stockholm University, Imperial College London, Institut polytechnique de Grenoble, Arcetri Astrophysical Observatory, Collurania Teramo Observatory, Uppsala University, University of Southampton, Ss. Cyril and Methodius University in Skopje, Netherlands Institute for Radio Astronomy, Université de Lille, Centrale Lille Institut, Princeton University, University of Oulu, Flatiron Institute
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,865
OpenAlex ID: W7202253513
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