The PAU Survey: measuring intrinsic galaxy alignments in deep wide fields as a function of colour, luminosity, stellar mass, and redshift

ABSTRACT We present the measurements and constraints of intrinsic alignments (IAs) in the Physics of the Accelerating Universe Survey (PAUS) deep wide fields, which include the W1 and W3 fields from the Canada–France–Hawaii Telescope Legacy Survey (CFHTLS) and the G09 field from the Kilo-Degree Survey (KiDS). Our analyses cover 51deg$^{2}$, in the photometric redshift (photo-z) range $0.1 < z_{\mathrm{b}} < 1$ and a magnitude limit $i_{\mathrm{AB}}< 22$. The precise photo-zs and the luminosity coverage of PAUS enable robust IA measurements, which are key for setting informative priors for upcoming stage-IV surveys. For red galaxies, we detect an increase in IA amplitude with both luminosity and stellar mass, extending previous results towards fainter and less massive regimes. As a function of redshift, we observe strong IA signals at intermediate ($z_{\mathrm{b}}\sim 0.55$) and high ($z_{\mathrm{b}}\sim 0.75$) redshift bins. However, we find no significant trend of IA evolution with redshift after accounting for the varying luminosities across redshift bins, consistent with the literature. For blue galaxies, no significant IA signal is detected, with $A_{1}=0.68_{-0.51}^{+0.53}$ when splitting only by galaxy colour, yielding some of the tightest constraints to date for the blue population and constraining a regime of very faint and low-mass galaxies.

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Publication Details

Journal
Monthly Notices of the Royal Astronomical Society
Published
2025-09-25
DOI
https://doi.org/10.1093/mnras/staf1630
Citations
2
Primary Topic
Astronomy and Astrophysical Research
Type
article
Field-Weighted Citation Impact
2.38

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article

The PAU Survey: measuring intrinsic galaxy alignments in deep wide fields as a function of colour, luminosity, stellar mass, and redshift

P. Tallada-Crespí, J. García-Bellido, C. M. Baugh, Francisco Javier Castander et al.
2 citations
Monthly Notices of the Royal Astronomical Society
Astronomy and Astrophysical Research
2.38
article

The PAU Survey: measuring intrinsic galaxy alignments in deep wide fields as a function of colour, luminosity, stellar mass, and redshift

P. Tallada-Crespí, J. García-Bellido, C. M. Baugh, Francisco Javier Castander, Martin Eriksen, Benjamin Joachimi, Romain Paviot, H. Hildebrandt, Henk Hoekstra, C. Padilla Aranda, Raquel Casas, Pablo Renard, D Navarro-Gironés, Anna Wittje, P. Fosalba, M. Siudek, I. Sevilla-Noarbe, S. Serrano, E. Fernández, R. Miquel, J Carretero, M Crocce E Gaztañaga
article en
2 citations

Abstract

ABSTRACT We present the measurements and constraints of intrinsic alignments (IAs) in the Physics of the Accelerating Universe Survey (PAUS) deep wide fields, which include the W1 and W3 fields from the Canada–France–Hawaii Telescope Legacy Survey (CFHTLS) and the G09 field from the Kilo-Degree Survey (KiDS). Our analyses cover 51deg$^{2}$, in the photometric redshift (photo-z) range $0.1 < z_{\mathrm{b}} < 1$ and a magnitude limit $i_{\mathrm{AB}}< 22$. The precise photo-zs and the luminosity coverage of PAUS enable robust IA measurements, which are key for setting informative priors for upcoming stage-IV surveys. For red galaxies, we detect an increase in IA amplitude with both luminosity and stellar mass, extending previous results towards fainter and less massive regimes. As a function of redshift, we observe strong IA signals at intermediate ($z_{\mathrm{b}}\sim 0.55$) and high ($z_{\mathrm{b}}\sim 0.75$) redshift bins. However, we find no significant trend of IA evolution with redshift after accounting for the varying luminosities across redshift bins, consistent with the literature. For blue galaxies, no significant IA signal is detected, with $A_{1}=0.68_{-0.51}^{+0.53}$ when splitting only by galaxy colour, yielding some of the tightest constraints to date for the blue population and constraining a regime of very faint and low-mass galaxies.

Monthly Notices of the Royal Astronomical SocietyVol. 545(2)
Institució Catalana de Recerca i Estudis Avançats (ES), Leiden University (NL), Centre National de la Recherche Scientifique (FR), Institute of Space Sciences (ES), University of the Basque Country (ES), Institute for High Energy Physics (ES), Durham University (GB), Université Paris Cité (FR), University of Applied Sciences Leiden (NL), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Université Paris-Saclay (FR), Astrophysique, Instrumentation et Modélisation (FR), Institut d'Estudis Espacials de Catalunya (ES), CEA Paris-Saclay (FR), Instituto de Astrofísica de Canarias (ES), Astronomical Institute of the Slovak Academy of Sciences (SK), Port d'Informació Científica (ES), Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (ES), Institute of Science and Technology, University College London (GB), University of Portsmouth (GB), Universidad Autónoma de Madrid (ES), Ruhr University Bochum (DE), Tsinghua University (CN)
UK Research and Innovation, Centres de Recerca de Catalunya, University College London, European Commission, Durham University, Deutsche Forschungsgemeinschaft, Universiteit Leiden, Generalitat de Catalunya, Eidgenössische Technische Hochschule Zürich, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Tsinghua University, Ministerio de Ciencia e Innovación, Universitat Autònoma de Barcelona, Narodowa Agencja Wymiany Akademickiej, Institut de Física d'Altes Energies, European Regional Development Fund, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Agencia Estatal de Investigación, Integrated Electronics Engineering Center, Binghamton University
Openalex Percentile: Top 10%
Astronomy and Astrophysical Research
2.38
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