Euclid Quick Data Release (Q1), A first look at the fraction of bars in massive galaxies at $z<1$ Article Swipe

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M Huertas-Company , M. Walmsley , M. Walmsley , Patricia Iglesias-Navarro , Patricia Iglesias-Navarro , S. Serjeant , S. Serjeant , L. Fortson , L. Fortson , Tobias Géron , William C. Keel , W. C. Keel , Sandor Kruk , Kameswara Bharadwaj Mantha , Karen L. Masters , K. Masters , Jürgen Popp , Jürgen Popp , H. L. Roberts , Jason Shingirai Makechemu , Jason Shingirai Makechemu , Richard J. Smethurst , Rebecca Smethurst , M. Baes , M. Baes , H. Domínguez Sánchez , H. Domínguez Sánchez , Hui Fu , J Junais , J. Méndez‐Abreu , J. Méndez‐Abreu , Francesco Shankar , M.N Le , M.N Le , Lingyu Wang , N. Aghanim , N. Aghanim , B. Altieri , S. Andreon , S. Andreon , N. Auricchio , M Baldi , Marco Baldi , S. Bardelli , S Bardelli , P Battaglia , Pietro Battaglia , Francis Bernardeau , A Bonchi , E. Branchini , M Brescia , M. Brescia , S Camera , V Capobianco , V. Capobianco , X. Dupac , S Casas , S Casas , L. Corcione , S. Cavuoti , M. Frailis , S. Desai , C Colodro-Conde , G. Congedo , J. Dinis , L. Conversi , Y. Copin , M. Cropper , H. M. Courtois , M Cropper , A. Da Silva , H Degaudenzi , H. Degaudenzi , G. De Lucia , C. Dolding , H. Dole , H. Dole , F Dubath , X Dupac , X. Dupac , S. Dusini , S. Escoffier , S. Escoffier , M. Farina , R. Farinelli , R. Farinelli , S Ferriol , S. Ferriol , S. Fotopoulou , S. Fotopoulou , W. A. Holmes , S. Galeotta , W. Gillard , W. Gillard , C Giocoli , J. Graciá-Carpio , J. Gracia-Carpio , F Grupp , S. Gwyn , Stephen Gwyn ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2503.15311

Stellar bars are key structures in disc galaxies, driving angular momentum redistribution and influencing processes such as bulge growth and star formation. Quantifying the bar fraction as a function of redshift and stellar mass is therefore important for constraining the physical processes that drive disc formation and evolution across the history of the Universe. Leveraging the unprecedented resolution and survey area of the Euclid Q1 data release combined with the Zoobot deep-learning model trained on citizen-science labels, we identify 7711 barred galaxies with $M_* \gtrsim 10^{10}M_\odot$ in a magnitude-selected sample $I_E < 20.5$ spanning $63.1 deg^2$. We measure a mean bar fraction of $0.2-0.4$, consistent with prior studies. At fixed redshift, massive galaxies exhibit higher bar fractions, while lower-mass systems show a steeper decline with redshift, suggesting earlier disc assembly in massive galaxies. Comparisons with cosmological simulations (e.g., TNG50, Auriga) reveal a broadly consistent bar fraction, but highlight overpredictions for high-mass systems, pointing to potential over-efficiency in central stellar mass build-up in simulations. These findings demonstrate Euclid's transformative potential for galaxy morphology studies and underscore the importance of refining theoretical models to better reproduce observed trends. Future work will explore finer mass bins, environmental correlations, and additional morphological indicators.

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2503.15311
PDF: https://arxiv.org/pdf/2503.15311
OA Status: green
OpenAlex ID: https://openalex.org/W4414903181

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DOI: https://doi.org/10.48550/arxiv.2503.15311

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Title: Euclid Quick Data Release (Q1), A first look at the fraction of bars in massive galaxies at $z<1$

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Type: preprint

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Language: en

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Publication year: 2025

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Publication date: 2025-03-19

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Authors: M Huertas-Company, M. Walmsley, M. Walmsley, Patricia Iglesias-Navarro, Patricia Iglesias-Navarro, S. Serjeant, S. Serjeant, L. Fortson, L. Fortson, Tobias Géron, William C. Keel, W. C. Keel, Sandor Kruk, Kameswara Bharadwaj Mantha, Karen L. Masters, K. Masters, Jürgen Popp, Jürgen Popp, H. L. Roberts, Jason Shingirai Makechemu, Jason Shingirai Makechemu, Richard J. Smethurst, Rebecca Smethurst, M. Baes, M. Baes, H. Domínguez Sánchez, H. Domínguez Sánchez, Hui Fu, J Junais, J. Méndez‐Abreu, J. Méndez‐Abreu, Francesco Shankar, M.N Le, M.N Le, Lingyu Wang, N. Aghanim, N. Aghanim, B. Altieri, S. Andreon, S. Andreon, N. Auricchio, M Baldi, Marco Baldi, S. Bardelli, S Bardelli, P Battaglia, Pietro Battaglia, Francis Bernardeau, A Bonchi, E. Branchini, M Brescia, M. Brescia, S Camera, V Capobianco, V. Capobianco, X. Dupac, S Casas, S Casas, L. Corcione, S. Cavuoti, M. Frailis, S. Desai, C Colodro-Conde, G. Congedo, J. Dinis, L. Conversi, Y. Copin, M. Cropper, H. M. Courtois, M Cropper, A. Da Silva, H Degaudenzi, H. Degaudenzi, G. De Lucia, C. Dolding, H. Dole, H. Dole, F Dubath, X Dupac, X. Dupac, S. Dusini, S. Escoffier, S. Escoffier, M. Farina, R. Farinelli, R. Farinelli, S Ferriol, S. Ferriol, S. Fotopoulou, S. Fotopoulou, W. A. Holmes, S. Galeotta, W. Gillard, W. Gillard, C Giocoli, J. Graciá-Carpio, J. Gracia-Carpio, F Grupp, S. Gwyn, Stephen Gwyn

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Landing page: https://arxiv.org/abs/2503.15311

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