Euclid preparation
Astronomy and Astrophysics, vol. 713, pp. A211
Abstract
The extragalactic background light (EBL) fluctuations in the optical/near-IR encode the cumulative emission of unresolved galaxies, integrated galaxy light (IGL), diffuse intra-halo light (IHL), and high- z sources from the epoch of reionisation (EoR), but they are difficult to disentangle with auto-spectra alone. Our aim was to decompose the EBL into its principal constituents using multi-band intensity mapping combined with cosmic shear and galaxy clustering. We developed a joint halo-model framework in which IHL follows a mass- and redshift-dependent luminosity scaling, IGL is set by an evolving Schechter luminosity function, and EoR emission is modelled with Pop II/III stellar emissivities and a binned star formation efficiency. Cosmic shear is modelled using the tidal alignment and tidal torquing model for intrinsic alignment. Using mock surveys in a flat Lambda cold dark matter (ΛCDM) cosmology with ten spectral bands spanning 0.75–5.0 μm in the north ecliptic pole deep fields over about 100deg 2 with source detections down to AB = 20.5 for masking, and six redshift bins to z = 2.5, we fit auto- and cross-power spectra using a Markov chain Monte Carlo method. The combined SPHEREx × Euclid analysis recovers all fiducial parameters within 1 σ and reduces 1 σ uncertainties on IHL parameters by 10–30% relative to SPHEREx EBL-only, while EoR star formation efficiency parameters improve by 20–30%. The predicted cross-correlations show a stronger coupling of IHL than IGL to the shear field within adopted model framework, enhancing component separation; conversely, the high- z EoR contribution shows negligible correlation with cosmic shear and galaxy clustering, aiding its isolation in the EBL. Relative to the SPHEREx EBL-only case, the inferred IHL fraction as a function of halo mass is significantly tightened over 10 11 –10 14 M ⊙ , with uncertainties reduced by 5–30%, and the resulting star formation rate density constraints extend to z ≈ 11, with uncertainty reductions of 15–30%. SPHEREx × Euclid provides a robust systematics-aware route to component-resolved EBL measurements and improved constraints on galaxy formation.
Authors 100
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University of California, Irvine
Affiliation as printed
Department of Physics & Astronomy, University of California Irvine
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University of California, Irvine
Affiliation as printed
Department of Physics & Astronomy, University of California Irvine
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University of California, Irvine
Affiliation as printed
Department of Physics & Astronomy, University of California Irvine
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California Institute of Technology
Affiliation as printed
California Institute of Technology
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Affiliation as printed
Center for Astrophysics and Cosmology, University of Nova Gorica
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Affiliation as printed
Cavendish Laboratory, University of Cambridge
Kavli Institute for Cosmology Cambridge
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University of British Columbia
Affiliation as printed
Department of Physics and Astronomy, University of British Columbia
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European Space Agency · European Space Astronomy Centre
Affiliation as printed
ESAC/ESA
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Affiliation as printed
School of Mathematics and Physics, University of Surrey
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Brera Astronomical Observatory · National Institute for Astrophysics
Affiliation as printed
INAF-Osservatorio Astronomico di Brera
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Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics
Affiliation as printed
INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna
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Scuola Internazionale Superiore di Studi Avanzati · Trieste Astronomical Observatory · Istituto Nazionale di Fisica Nucleare, Sezione di Trieste · Institute for Fundamental Physics of the Universe · National Institute for Astrophysics
Affiliation as printed
IFPU, Institute for Fundamental Physics of the Universe
INAF-Osservatorio Astronomico di Trieste
INFN, Sezione di Trieste
SISSA, International School for Advanced Studies
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Istituto Nazionale di Fisica Nucleare, Sezione di Bologna · Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics · University of Bologna
Affiliation as printed
Dipartimento di Fisica e Astronomia, Università di Bologna
INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna
INFN-Sezione di Bologna
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Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics
Affiliation as printed
INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna
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Trieste Astronomical Observatory · Institute for Fundamental Physics of the Universe · National Institute for Astrophysics
Affiliation as printed
IFPU, Institute for Fundamental Physics of the Universe
INAF-Osservatorio Astronomico di Trieste
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Brera Astronomical Observatory · Istituto Nazionale di Fisica Nucleare, Sezione di Genova · University of Genoa · National Institute for Astrophysics
Affiliation as printed
Dipartimento di Fisica, Università di Genova
INAF-Osservatorio Astronomico di Brera
INFN-Sezione di Genova
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Astronomical Observatory of Capodimonte · University of Naples Federico II · National Institute for Astrophysics
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Department of Physics “E. Pancini”, University Federico II
INAF-Osservatorio Astronomico di Capodimonte
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Istituto Nazionale di Fisica Nucleare, Sezione di Torino · Osservatorio Astrofisico di Torino · University of Turin · National Institute for Astrophysics
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Dipartimento di Fisica, Università degli Studi di Torino
INAF-Osservatorio Astrofisico di Torino
INFN-Sezione di Torino
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Leiden University · Royal Observatory · Leiden Observatory · University of Edinburgh
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Institute for Astronomy, University of Edinburgh, Royal Observatory
Leiden Observatory, Leiden University
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Osservatorio Astrofisico di Torino · National Institute for Astrophysics
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INAF-Osservatorio Astrofisico di Torino
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National Institute for Astrophysics
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INAF-IASF Milano
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Universitat Autònoma de Barcelona · Port d'Informació Científica · Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
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Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT)
Port d’Informació Científica, Campus UAB
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Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) · RWTH Aachen University
Affiliation as printed
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
Institute for Theoretical Particle Physics and Cosmology (TTK), RWTH Aachen University
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Astronomical Observatory of Rome · National Institute for Astrophysics
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INAF-Osservatorio Astronomico di Roma
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Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics
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INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna
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Istituto Nazionale di Fisica Nucleare · Astronomical Observatory of Capodimonte · Istituto Nazionale di Fisica Nucleare, Sezione di Napoli · National Institute for Astrophysics
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INAF-Osservatorio Astronomico di Capodimonte
INFN section of Naples
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University of Hawaiʻi at Mānoa · University of Hawaii System
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Institute for Astronomy, University of Hawaii
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Dipartimento di Fisica e Astronomia “Augusto Righi” – Alma Mater Studiorum Università di Bologna
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Instituto de Astrofísica de Canarias
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Instituto de Astrofísica de Canarias
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Royal Observatory · University of Edinburgh
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Institute for Astronomy, University of Edinburgh, Royal Observatory
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Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester
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European Space Agency · European Space Astronomy Centre · European Space Research Institute
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ESAC/ESA
European Space Agency/ESRIN
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Lyon 1 Université · Centre National de la Recherche Scientifique · Institut National de Physique Nucléaire et de Physique des Particules · Institut de Physique des 2 Infinis de Lyon
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Université Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822
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Institució Catalana de Recerca i Estudis Avançats · Institute of Space Sciences · Consejo Superior de Investigaciones Científicas · Institut de Ciències del Cosmos · Universitat de Barcelona
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Institució Catalana de Recerca i Estudis Avançats (ICREA)
Institut de Ciencies de l’Espai (IEEC-CSIC), Campus UAB
Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona (IEEC-UB)
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Centre National de la Recherche Scientifique · Institut National de Physique Nucléaire et de Physique des Particules · Institut de Physique des 2 Infinis de Lyon
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UCB Lyon 1, CNRS/IN2P3, IUF, IP2I Lyon
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Centre National de la Recherche Scientifique · Université Paris Cité · Commissariat à l'Énergie Atomique et aux Énergies Alternatives · Université Paris-Saclay · Astrophysique, Instrumentation et Modélisation
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Université Paris-Saclay, Université Paris Cité, CEA, CNRS, AIM
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Department of Astronomy, University of Geneva
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Trieste Astronomical Observatory · National Institute for Astrophysics
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INAF-Osservatorio Astronomico di Trieste
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Centre National de la Recherche Scientifique · Université Paris-Saclay · Institut d'Astrophysique Spatiale
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Université Paris-Saclay, CNRS, Institut d’astrophysique spatiale
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Centre National de la Recherche Scientifique · Université Paris-Saclay · Institut d'Astrophysique Spatiale
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Université Paris-Saclay, CNRS, Institut d’astrophysique spatiale
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Department of Astronomy, University of Geneva
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European Space Agency · European Space Astronomy Centre
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ESAC/ESA
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Institute for Space Astrophysics and Planetology · National Institute for Astrophysics
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INAF-Istituto di Astrofisica e Planetologia Spaziali
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Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics
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INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna
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Astronomical Observatory of Rome · Agenzia Spaziale Italiana · National Institute for Astrophysics
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INAF-Osservatorio Astronomico di Roma
Space Science Data Center, Italian Space Agency
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Lyon 1 Université · Centre National de la Recherche Scientifique · Institut National de Physique Nucléaire et de Physique des Particules · Institut de Physique des 2 Infinis de Lyon
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Université Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822
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Istituto Nazionale di Fisica Nucleare, Sezione di Bologna · Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics
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INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna
INFN-Bologna
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Trieste Astronomical Observatory · National Institute for Astrophysics
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INAF-Osservatorio Astronomico di Trieste
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Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics
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INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna
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National Institute for Astrophysics
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INAF-IASF Milano
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Trieste Astronomical Observatory · National Institute for Astrophysics
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INAF-Osservatorio Astronomico di Trieste
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Ludwig-Maximilians-Universität München
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University Observatory, LMU Faculty of Physics
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Royal Observatory · University of Edinburgh
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Institute for Astronomy, University of Edinburgh, Royal Observatory
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Istituto Nazionale di Fisica Nucleare, Sezione di Bologna · Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics
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INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna
INFN-Sezione di Bologna
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Max Planck Institute for Extraterrestrial Physics
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Max Planck Institute for Extraterrestrial Physics
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Osservatorio Astronomico di Padova · National Institute for Astrophysics
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INAF-Osservatorio Astronomico di Padova
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Max Planck Institute for Extraterrestrial Physics · Ludwig-Maximilians-Universität München
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Max Planck Institute for Extraterrestrial Physics
Universitäts-Sternwarte München, Fakultät für Physik, Ludwig-Maximilians-Universität München
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Institute of Theoretical Astrophysics, University of Oslo
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Jet Propulsion Laboratory, California Institute of Technology
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Felix Hormuth Engineering
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Technical University of Denmark
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Cosmic Dawn Center (DAWN)
Technical University of Denmark
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Max Planck Institute for Astronomy
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Max-Planck-Institut für Astronomie
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NASA Goddard Space Flight Center
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Department of Physics and Astronomy, University College London
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Centre National de la Recherche Scientifique · Aix-Marseille Université · Centre de physique des particules de Marseille · Institut National de Physique Nucléaire et de Physique des Particules
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Aix-Marseille Université, CNRS/IN2P3, CPPM
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Jet Propulsion Laboratory, California Institute of Technology
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Lyon 1 Université · Centre National de la Recherche Scientifique · Institut National de Physique Nucléaire et de Physique des Particules · Institut de Physique des 2 Infinis de Lyon
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Université Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822
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Université de Genève, Département de Physique Théorique and Centre for Astroparticle Physics
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University of Helsinki · Helsinki Institute of Physics
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Department of Physics, P.O. Box 64, University of Helsinki
Helsinki Institute of Physics, Gustaf Hällströmin katu 2, University of Helsinki
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Centre National de la Recherche Scientifique · Université Paris Sciences et Lettres · Observatoire de Paris · Sorbonne Université · Laboratoire d'Étude de l'Univers et des Phénomènes Extrêmes
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Laboratoire d’etude de l’Univers et des phenomenes eXtremes, Observatoire de Paris, Université PSL, Sorbonne Université, CNRS
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Osservatorio Astrofisico di Torino · National Institute for Astrophysics
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INAF-Osservatorio Astrofisico di Torino
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Institute of Theoretical Astrophysics, University of Oslo
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University of Helsinki · Helsinki Institute of Physics
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Department of Physics, P.O. Box 64, University of Helsinki
Helsinki Institute of Physics, Gustaf Hällströmin katu 2, University of Helsinki
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SKAO, Jodrell Bank, Lower Withington
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Centre National de la Recherche Scientifique · Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules
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Centre de Calcul de l’IN2P3/CNRS
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University of Milan · Istituto Nazionale di Fisica Nucleare, Sezione di Milano · National Institute for Astrophysics
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Dipartimento di Fisica “Aldo Pontremoli”, Università degli Studi di Milano
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INFN-Sezione di Milano
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Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics
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INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna
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Trieste Astronomical Observatory · National Institute for Astrophysics
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INAF-Osservatorio Astronomico di Trieste
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FHNW University of Applied Sciences and Arts Northwestern Switzerland
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University of Applied Sciences and Arts of Northwestern Switzerland, School of Computer Science
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Universität Bonn, Argelander-Institut für Astronomie
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Astronomical Observatory of Rome · Istituto Nazionale di Fisica Nucleare, Sezione di Roma I · National Institute for Astrophysics
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INAF-Osservatorio Astronomico di Roma
INFN-Sezione di Roma
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Centre National de la Recherche Scientifique · Aix-Marseille Université
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Aix-Marseille Université, CNRS, CNES, LAM
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Istituto Nazionale di Fisica Nucleare, Sezione di Bologna · Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics · University of Bologna
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Dipartimento di Fisica e Astronomia “Augusto Righi” – Alma Mater Studiorum Università di Bologna
INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna
INFN-Sezione di Bologna
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Affiliation as printed
Department of Physics, Institute for Computational Cosmology, Durham University
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Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics
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INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna
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Centre National de la Recherche Scientifique · Université Paris Cité · Institut National de Physique Nucléaire et de Physique des Particules · Centre Pierre Binétruy
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CNRS-UCB International Research Laboratory, Centre Pierre Binétruy, IRL2007, CPB-IN2P3
Université Paris Cité, CNRS, Astroparticule et Cosmologie
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Centre National de la Recherche Scientifique · Institut d'Astrophysique de Paris · Sorbonne Université
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Institut d’Astrophysique de Paris
Institut d’Astrophysique de Paris, UMR 7095, CNRS, and Sorbonne Université
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Istituto Nazionale di Fisica Nucleare, Sezione di Bologna · Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics
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INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna
INFN-Sezione di Bologna
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Astronomical Observatory of Rome · National Institute for Astrophysics
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INAF-Osservatorio Astronomico di Roma
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École Polytechnique Fédérale de Lausanne
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Institute of Physics, Laboratory of Astrophysics, Ecole Polytechnique Fédérale de Lausanne (EPFL)
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Affiliation as printed
Telespazio UK S.L. for European Space Agency (ESA)
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Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics · University of Bologna
Affiliation as printed
Dipartimento di Fisica e Astronomia “Augusto Righi” – Alma Mater Studiorum Università di Bologna
INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna
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Istituto Nazionale di Fisica Nucleare, Sezione di Bologna · Osservatorio di Astrofisica e Scienza dello Spazio · National Institute for Astrophysics · University of Bologna
Affiliation as printed
Dipartimento di Fisica e Astronomia “Augusto Righi” – Alma Mater Studiorum Università di Bologna
INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna
INFN-Sezione di Bologna
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Universitat Autònoma de Barcelona · Institute for High Energy Physics · Barcelona Institute of Science and Technology · Port d'Informació Científica
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Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB
Port d’Informació Científica, Campus UAB
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European Space Agency · European Space Research and Technology Centre
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European Space Agency/ESTEC
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Institute for High Energy Physics · Barcelona Institute of Science and Technology
Affiliation as printed
Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB
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Affiliation as printed
Department of Astronomy, University of Geneva
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Trieste Astronomical Observatory · National Institute for Astrophysics
Affiliation as printed
INAF-Osservatorio Astronomico di Trieste
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Affiliation as printed
DARK, Niels Bohr Institute, University of Copenhagen
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University of Waterloo · Perimeter Institute
Affiliation as printed
Department of Physics and Astronomy, University of Waterloo
Perimeter Institute for Theoretical Physics, Waterloo
Waterloo Centre for Astrophysics, University of Waterloo, Waterloo
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