: Discovery of bright
Springer Link (Chiba Institute of Technology)
Abstract
We present a search for z ≃ 7 Lyman-break galaxies using the 1.72 deg2 near-infrared (NIR) UltraVISTA survey in the COSMOS field, reaching 5σ depths in Y of 26.2. We incorporated deep Euclid optical and Euclid + Spitzer NIR imaging for a full spectral energy distribution (SED) fitting analysis. We found 289 candidate galaxies at 6.5 ≤ z ≤ 7.5 covering −22.6 ≤ MUV ≤ −20.2, faint enough to overlap with Hubble Space Telescope studies. We conducted a separate selection by including complementary Euclid performance verification imaging (reaching 5σ depths of 26.3), yielding 140 galaxies in 0.65 deg2, with 38 sources unique to this sample. We computed the rest-frame UV luminosity function (UV LF) from our samples, extending below the knee ($ M^{*}=-21.14^{+0.28}_{-0.25} $). We find that the shape of the UV LF is consistent with both a Schechter function and a double power law (DPL) at the magnitudes probed by this sample, with a DPL preferred at MUV < −22.5 when bright-end results are included. The UltraVISTA + Euclid sample provides a clean measurement of the LF due to the overlapping NIR filters identifying molecular absorption features in the SEDs of ultra-cool dwarf interlopers, and additional faint galaxies were recovered. A comparison with JWST LFs at z > 7 suggests a gentle evolution in the bright-end slope, although this is limited by a lack of robust bright-end measurements at z > 9. We forecast that in the Euclid Deep Fields, the removal of contaminant ultra-cool dwarfs as point sources will be possible at JE < 24.5. Finally, we present a high-equivalent-width Lyman-α emitter candidate identified by combining HSC, VISTA, and Euclid broadband photometry, highlighting the synergistic power these instruments will have in the Euclid Auxiliary Fields for identifying extreme sources in the epoch of reionisation.
Authors 100
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Department of Physics , Oxford University , Keble Road , Oxford OX1 3RH , UK
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Jodrell Bank Centre for Astrophysics , Department of Physics and Astronomy , University of Manchester , Oxford Road , Manchester M13 9PL , UK
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University of Oxford · University of the Western Cape
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Department of Physics , Oxford University , Keble Road , Oxford OX1 3RH , UK
Department of Physics and Astronomy , University of the Western Cape , Bellville , Cape Town 7535 , South Africa
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Massachusetts Institute of Technology
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MIT Kavli Institute for Astrophysics and Space Research , Mas- sachusetts Institute of Technology , Cambridge , MA 02139 , USA
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Max Planck Institute for Astronomy
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Max-Planck-Institut für Astronomie , Königstuhl 17 , 69117 Heidel- berg , Germany
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University of Oxford · University of Portsmouth
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Department of Physics , Oxford University , Keble Road , Oxford OX1 3RH , UK
Institute of Cosmology and Gravitation , University of Portsmouth , Portsmouth PO1 3FX , UK
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Cosmic Dawn Center (DAWN )
Kapteyn Astronomical Institute , University of Groningen , PO Box 800 , 9700 AV Groningen , The Netherlands
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Department of Physics & Astronomy , University of Sussex , Brighton BN1 9QH , UK
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Leiden University · Leiden Observatory
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Leiden Observatory , Leiden University , Einsteinweg 55 , 2333 CC Leiden , The Netherlands
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Cosmic Dawn Center (DAWN )
Niels Bohr Institute , University of Copenhagen , Jagtvej 128 , 2200 Copenhagen , Denmark
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Department of Physics , Oxford University , Keble Road , Oxford OX1 3RH , UK
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School of Mathematics and Physics , University of Surrey , Guild- ford , Surrey GU2 7XH , UK
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Brera Astronomical Observatory
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INAF-Osservatorio Astronomico di Brera , Via Brera 28 , 20122 Milano , Italy
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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 , Via Piero Gobetti 93/3 , 40129 Bologna , Italy
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University of Helsinki , 00014 Helsinki , Finland
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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 , Via Piero Gobetti 93/3 , 40129 Bologna , Italy
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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 , Via Piero Gobetti 93/3 , 40129 Bologna , Italy
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University of Helsinki , 00014 Helsinki , Finland
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Brera Astronomical Observatory
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INAF-Osservatorio Astronomico di Brera , Via Brera 28 , 20122 Milano , Italy
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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Leiden University · Leiden Observatory
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Leiden Observatory , Leiden University , Einsteinweg 55 , 2333 CC Leiden , The Netherlands
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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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 , Via Piero Gobetti 93/3 , 40129 Bologna , Italy
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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Jodrell Bank Centre for Astrophysics , Department of Physics and Astronomy , University of Manchester , Oxford Road , Manchester M13 9PL , UK
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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Department of Astronomy , University of Geneva , ch. d'Ecogia 16 , 1290 Versoix , Switzerland
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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Department of Astronomy , University of Geneva , ch. d'Ecogia 16 , 1290 Versoix , Switzerland
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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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 , Via del Fosso del Cavaliere , 100 , 00100 Roma , Italy
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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 , Via Piero Gobetti 93/3 , 40129 Bologna , Italy
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Space Science Data Center , Italian Space Agency , Via del Politec- nico snc , 00133 Roma , Italy
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University of Helsinki , 00014 Helsinki , Finland
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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 , Via Piero Gobetti 93/3 , 40129 Bologna , Italy
INFN-Bologna , Via Irnerio 46 , 40126 Bologna , Italy
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Institute of Space Sciences · Institut d'Estudis Espacials de Catalunya
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Institut d'Estudis Espacials de Catalunya (IEEC) , Edifici RDIT , Campus UPC , 08860 Castelldefels , Barcelona , Spain
Institute of Space Sciences (ICE , CSIC) , Campus UAB , Carrer de Can Magrans , s/n , 08193 Barcelona , Spain
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University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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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 , Via Piero Gobetti 93/3 , 40129 Bologna , Italy
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University of Helsinki , 00014 Helsinki , Finland
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Ludwig-Maximilians-Universität München
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University Observatory , LMU Faculty of Physics , Scheinerstrasse 1 , 81679 Munich , Germany
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University of Helsinki , 00014 Helsinki , Finland
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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 , Via Piero Gobetti 93/3 , 40129 Bologna , Italy
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Max Planck Institute for Extraterrestrial Physics
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Max Planck Institute for Extraterrestrial Physics , Giessenbachstr. 1 , 85748 Garching , Germany
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Osservatorio Astronomico di Padova
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INAF-Osservatorio Astronomico di Padova , Via dell'Osservatorio 5 , 35122 Padova , Italy
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Max Planck Institute for Extraterrestrial Physics · Ludwig-Maximilians-Universität München
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Max Planck Institute for Extraterrestrial Physics , Giessenbachstr. 1 , 85748 Garching , Germany
Universitäts-Sternwarte München , Fakultät für Physik , Ludwig- Maximilians-Universität München , Scheinerstrasse 1 , 81679 München , Germany
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Institute of Theoretical Astrophysics , University of Oslo , P.O. Box 1029 , Blindern 0315 , Oslo , Norway
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University of Helsinki , 00014 Helsinki , Finland
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Leiden University · Leiden Observatory
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Leiden Observatory , Leiden University , Einsteinweg 55 , 2333 CC Leiden , The Netherlands
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Jet Propulsion Laboratory , California Institute of Technology , 4800 Oak Grove Drive , Pasadena , CA 91109 , USA
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Department of Physics , Lancaster University , Lancaster LA1 4YB , UK
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Felix Hormuth Engineering , Goethestr. 17 , 69181 Leimen , Ger - many
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Technical University of Denmark
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Cosmic Dawn Center (DAWN) , Denmark
Technical University of Denmark , Elektrovej 327 , 2800 Kgs. Lyn - gby , Denmark
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Max Planck Institute for Astronomy
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Max-Planck-Institut für Astronomie , Königstuhl 17 , 69117 Heidel- berg , Germany
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NASA Goddard Space Flight Center , Greenbelt , MD 20771 , USA
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Department of Physics and Astronomy , University College Lon- don , Gower Street , London WC1E 6BT , UK
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University of Helsinki · Helsinki Institute of Physics
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Department of Physics and Helsinki Institute of Physics , Gustaf Hällströmin katu 2 , University of Helsinki , 00014 Helsinki , Finland
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University of Helsinki , 00014 Helsinki , Finland
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Jet Propulsion Laboratory , California Institute of Technology , 4800 Oak Grove Drive , Pasadena , CA 91109 , USA
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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 , 91191 Gif-sur-Yvette , France
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Ludwig-Maximilians-Universität München
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Universitäts-Sternwarte München , Fakultät für Physik , Ludwig- Maximilians-Universität München , Scheinerstrasse 1 , 81679 München , Germany
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Université de Genève , Département de Physique Théorique and Centre for Astroparticle Physics , 24 quai Ernest-Ansermet , CH- 1211 Genève 4 , Switzerland
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University of Helsinki · Helsinki Institute of Physics
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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 ,
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Institute of Theoretical Astrophysics , University of Oslo , P.O. Box 1029 , Blindern 0315 , Oslo , Norway
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Department of Physics , P.O. Box 64 , University of Helsinki , 00014 Helsinki , Finland
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SKAO , Jodrell Bank , Lower Withington , Macclesfield SK11 9FT , United Kingdom
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Centre de Calcul de l'IN2P3/CNRS , 21 avenue Pierre de Coubertin , 69627 Villeurbanne Cedex , France
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University of Milan · Istituto Nazionale di Fisica Nucleare, Sezione di Milano
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Dipartimento di Fisica "Aldo Pontremoli" , Università degli Studi di Milano , Via Celoria 16 , 20133 Milano , Italy
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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 , Via Piero Gobetti 93/3 , 40129 Bologna , Italy
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Universität Bonn , Argelander-Institut für Astronomie , Auf dem Hügel 71 , 53121 Bonn , Germany
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INFN-Sezione di Roma , Piazzale Aldo Moro ,
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Aix-Marseille Université , CNRS , CNES , LAM , Marseille , France
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Centre National de la Recherche Scientifique · Durham University · Université Paris Cité · Institut d'Astrophysique de Paris · Laboratoire AstroParticule et Cosmologie · Institut National de Physique Nucléaire et de Physique des Particules · Osservatorio di Astrofisica e Scienza dello Spazio · Centre Pierre Binétruy · National Institute for Astrophysics · University of Bologna
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Dipartimento di Fisica e Astronomia "Augusto Righi" -Alma Mater Studiorum Università di Bologna, Via Piero Gobetti 93/2, 40129 Bologna, Italy 83 Department of Physics, Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE, UK 84 Université Paris Cité, CNRS, Astroparticule et Cosmologie, 75013 Paris, France 85 CNRS-UCB International Research Laboratory, Centre Pierre Binétruy, IRL2007, CPB-IN2P3 Berkeley, USA 86 University of Applied Sciences and Arts of Northwestern Switzer- land, School of Engineering, 5210 Windisch, Switzerland 87 Institut d'Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France 88 Institut d'Astrophysique de Paris, UMR 7095, CNRS, and Sor- bonne Université, 98 bis boulevard Arago, 75014 Paris, France 89 Institute of Physics, Laboratory of Astrophysics, Ecole Polytech- nique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290 Versoix, Switzerland 90 Telespazio UK S.L. for European Space Agency (ESA), Camino bajo del
INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna , Via Piero Gobetti 93/3 , 40129 Bologna , Italy
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Affiliation as printed
University of Helsinki , 00014 Helsinki , Finland
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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 , Via Piero Gobetti 93/3 , 40129 Bologna , Italy
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Affiliation as printed
University of Helsinki , 00014 Helsinki , Finland
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