---
DOAJ_listed: '1'
OA_place: publisher
OA_type: diamond
PlanS_conform: '1'
_id: '23044'
abstract:
- lang: eng
  text: We report the discovery of 31 new high-z quasars in the redshift range 6.6 < z < 7.8.
    These quasars were selected from approximately 3000 deg2 of sky covered during
    the first 1.5 years of the Euclid Wide Survey, representing the initial results
    of the Euclid high-z quasar search. Our candidate selection employed multiple
    machine-learning and probabilistic techniques applied to the EuclidIE, YE, JE,
    and HE images, supplemented by ancillary z-band data when available. Spectroscopic
    follow-up observations were carried out with Keck, Magellan, and the Large Binocular
    Telescope (LBT). Among the new discoveries, there are 12 quasars at z ≥ 7, more
    than doubling the number of previously known quasars at z ≥ 7. The newly discovered
    quasars exhibit 21.2 < JE < 23.2 (−25.5 < M1450 < −23.6), extending quasar studies
    to the faint end of the quasar luminosity function (QLF) at z ≳ 7. The quasar
    with the highest-z, EUCL J172902.75+641018.1 at z ≈ 7.77, sets the new redshift
    record for the most distant quasar ever reported. These discoveries demonstrate
    Euclid’s transformative role in high-z quasar discovery and set the stage for
    future follow-up studies of the early galaxies hosting quasars, supermassive black
    hole growth, and the intergalactic medium in the epoch of reionisation.
acknowledgement: 'D. Yang acknowledges helpful discussions with members of the ENIGMA
  group at UC Santa Barbara and Leiden University, in particular Elia Pizzati, Silvia
  Onorato, and Diego González for their valuable feedback. D. Yang thanks Shane Bechtel
  for assistance during observations, and acknowledges the early contributions of
  Riccardo Nanni, which helped lay the foundation for this work. D. Yang and J. F.
  Hennawi acknowledge support from the European Research Council (ERC) under the European
  Union’s Horizon 2020 research and innovation program (grant agreement No 885301).
  J. F. Hennawi acknowledges support from NSF grant No. 2307180. F. Guarneri and J.-T.
  Schindler are supported by the Deutsche Forschungsgemeinschaft (DFG, German Research
  Foundation) – Project number 518006966. F. Wang acknowledges support from NSF award
  AST-2513040. R. Decarli acknowledges support from the INAF GO 2022 grant “The birth
  of the giants: JWST sheds light on the build-up of quasars at cosmic dawn”, INAF
  Minigrant 2024 “The interstellar medium at high redshift”, and by the PRIN MUR “2022935STW”,
  RFF M4.C2.1.1, CUP J53D23001570006 and C53D23000950006. S. E. I. Bosman is supported
  by the Deutsche Forschungsgemeinschaft (DFG) under Emmy Noether grant number BO
  5771/1-1. Y. Harikane acknowledges support from the Japan Society for the Promotion
  of Science (JSPS) Grant-in-Aid for Scientific Research (24H00245), the JSPS Core-to-Core
  Program (JPJSCCA20210003), and the JSPS International Leading Research (22K21349).
  J. R. Weaver acknowledges that support for this work was provided by The Brinson
  Foundation through a Brinson Prize Fellowship grant. The Euclid Consortium acknowledges
  the European Space Agency and a number of agencies and institutes that have supported
  the development of Euclid, in particular the Agenzia Spaziale Italiana, the Austrian
  Forschungsförderungsgesellschaft funded through BMIMI, the Belgian Science Policy,
  the Canadian Euclid Consortium, the Deutsches Zentrum für Luft- und Raumfahrt, the
  DTU Space and the Niels Bohr Institute in Denmark, the French Centre National d’Etudes
  Spatiales, the Fundação para a Ciência e a Tecnologia, the Hungarian Academy of
  Sciences, the Ministerio de Ciencia, Innovación y Universidades, the National Aeronautics
  and Space Administration, the National Astronomical Observatory of Japan, the Netherlandse
  Onderzoekschool Voor Astronomie, the Norwegian Space Agency, the Research Council
  of Finland, the Romanian Space Agency, the State Secretariat for Education, Research,
  and Innovation (SERI) at the Swiss Space Office (SSO), and the United Kingdom Space
  Agency. A complete and detailed list is available on the Euclid web site (www.euclid-ec.org).
  Some of the data presented herein were obtained at Keck Observatory, which is a
  private 501(c)3 non-profit organization operated as a scientific partnership among
  the California Institute of Technology, the University of California, and the National
  Aeronautics and Space Administration. The Observatory was made possible by the generous
  financial support of the W. M. Keck Foundation. The authors wish to recognise and
  acknowledge the very significant cultural role and reverence that the summit of
  Maunakea has always had within the Native Hawaiian community. We are most fortunate
  to have the opportunity to conduct observations from this mountain. This paper includes
  data gathered with the 6.5 meter Magellan Telescopes located at Las Campanas Observatory,
  Chile. This work uses LBT data from programmes: MPIA-2025A-007 and MPIA-2025B-004.
  The LBT is an international collaboration among institutions in the United States,
  Italy and Germany. LBT Corporation partners are: The University of Arizona on behalf
  of the Arizona university system; Istituto Nazionale di Astrofisica, Italy; LBT
  Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, the Astrophysical
  Institute Potsdam, and Heidelberg University; The Ohio State University, and The
  Research Corporation, on behalf of The University of Notre Dame, University of Minnesota,
  and University of Virginia, LOFAR data products were provided by the LOFAR Surveys
  Key Science project (LSKSP; https://lofar-surveys.org/) and were derived from observations
  with the International LOFAR Telescope (ILT). LOFAR is the Low Frequency Array designed
  and constructed by ASTRON. It has observing, data processing, and data storage facilities
  in several countries, which are owned by various parties (each with their own funding
  sources), and which are collectively operated by the ILT foundation under a joint
  scientific policy. The efforts of the LSKSP have benefited from funding from the
  European Research Council, NOVA, NWO, CNRS-INSU, the SURF Co-operative, the UK Science
  and Technology Funding Council and the Jülich Supercomputing Centre. We make use
  of z-band imaging from the Wide Imaging with Subaru HSC of the Euclid Sky (WISHES)
  program operated by the Subaru Telescope, which is operated by the National Astronomical
  Observatory of Japan. We also make use of z-band imaging from the Dark Energy Survey
  (DES), based on observations obtained at the Cerro Tololo Inter-American Observatory,
  National Optical Astronomy Observatory, which is operated by AURA under a cooperative
  agreement with the National Science Foundation. This work made use of NumPy (Harris
  et al. 2020), SciPy (Virtanen et al. 2020), Astropy (Astropy Collaboration 2013,
  2018, 2022), PypeIt (Prochaska et al. 2020), Sculptor (Schindler 2022), condXD (Kang
  et al. 2025), pysersic (Pasha & Miller 2023), Matplotlib (Hunter 2007), corner.py
  (Foreman-Mackey 2016), healpy (Zonca et al. 2020).'
article_number: A104
article_processing_charge: No
article_type: original
arxiv: 1
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  last_name: Simon
- first_name: C.
  full_name: Sirignano, C.
  last_name: Sirignano
- first_name: G.
  full_name: Sirri, G.
  last_name: Sirri
- first_name: L.
  full_name: Stanco, L.
  last_name: Stanco
- first_name: J.
  full_name: Steinwagner, J.
  last_name: Steinwagner
- first_name: P.
  full_name: Tallada-Crespí, P.
  last_name: Tallada-Crespí
- first_name: I.
  full_name: Tereno, I.
  last_name: Tereno
- first_name: N.
  full_name: Tessore, N.
  last_name: Tessore
- first_name: S.
  full_name: Toft, S.
  last_name: Toft
- first_name: R.
  full_name: Toledo-Moreo, R.
  last_name: Toledo-Moreo
- first_name: F.
  full_name: Torradeflot, F.
  last_name: Torradeflot
- first_name: I.
  full_name: Tutusaus, I.
  last_name: Tutusaus
- first_name: L.
  full_name: Valenziano, L.
  last_name: Valenziano
- first_name: J.
  full_name: Valiviita, J.
  last_name: Valiviita
- first_name: T.
  full_name: Vassallo, T.
  last_name: Vassallo
- first_name: Y.
  full_name: Wang, Y.
  last_name: Wang
- first_name: J.
  full_name: Weller, J.
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- first_name: F. M.
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  last_name: Zerbi
- first_name: E.
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  last_name: Huertas-Company
- first_name: J.
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- first_name: V.
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- first_name: M.
  full_name: Viel, M.
  last_name: Viel
citation:
  ama: 'Yang D, Hennawi JF, Guarneri F, et al. Euclid: Discovery of 31 new quasars
    at 6.6 &#60; z &#60; 7.8. <i>Astronomy and Astrophysics</i>. 2026;711. doi:<a
    href="https://doi.org/10.1051/0004-6361/202658883">10.1051/0004-6361/202658883</a>'
  apa: 'Yang, D., Hennawi, J. F., Guarneri, F., Wolf, J., Belladitta, S., Schindler,
    J. T., … Viel, M. (2026). Euclid: Discovery of 31 new quasars at 6.6 &#60; z &#60;
    7.8. <i>Astronomy and Astrophysics</i>. EDP Sciences. <a href="https://doi.org/10.1051/0004-6361/202658883">https://doi.org/10.1051/0004-6361/202658883</a>'
  chicago: 'Yang, D., J. F. Hennawi, F. Guarneri, J. Wolf, S. Belladitta, J. T. Schindler,
    A. C.N. Hughes, et al. “Euclid: Discovery of 31 New Quasars at 6.6 &#60; z &#60;
    7.8.” <i>Astronomy and Astrophysics</i>. EDP Sciences, 2026. <a href="https://doi.org/10.1051/0004-6361/202658883">https://doi.org/10.1051/0004-6361/202658883</a>.'
  ieee: 'D. Yang <i>et al.</i>, “Euclid: Discovery of 31 new quasars at 6.6 &#60;
    z &#60; 7.8,” <i>Astronomy and Astrophysics</i>, vol. 711. EDP Sciences, 2026.'
  ista: 'Yang D et al. 2026. Euclid: Discovery of 31 new quasars at 6.6 &#60; z &#60;
    7.8. Astronomy and Astrophysics. 711, A104.'
  mla: 'Yang, D., et al. “Euclid: Discovery of 31 New Quasars at 6.6 &#60; z &#60;
    7.8.” <i>Astronomy and Astrophysics</i>, vol. 711, A104, EDP Sciences, 2026, doi:<a
    href="https://doi.org/10.1051/0004-6361/202658883">10.1051/0004-6361/202658883</a>.'
  short: D. Yang, J.F. Hennawi, F. Guarneri, J. Wolf, S. Belladitta, J.T. Schindler,
    A.C.N. Hughes, E. Bañados, D.J. Mortlock, J. Yang, F. Wang, X. Fan, K. Jahnke,
    D. Stern, C.J. Willott, A.J. Barth, H.J.A. Rottgering, R.G. Varadaraj, R. Decarli,
    A.C. Eilers, M. Ezziati, Y. Fu, J. Huang, X. Jin, Y. Kang, L.N. Martinez-Ramirez,
    Y. Matsuoka, M. Onoue, R. Pello, R.P. Remigio, W.L. Tee, B. Venemans, G. Vietri,
    B. Wang, L.J. Abbo, H. Atek, S. Bisogni, S.E.I. Bosman, R.A.A. Bowler, C.J. Conselice,
    F.B. Davies, C.M. Gutierrez, Y. Harikane, K. Rubinur, C.C. Lovell, M. Magliocchetti,
    J.J. Matthee, F. Ricci, M. Scialpi, D. Scott, L. Spinoglio, F. Tarsitano, Y. Toba,
    F. Walter, J.R. Weaver, G. Zamorani, B. Altieri, A. Amara, S. Andreon, H. Aussel,
    C. Baccigalupi, M. Baldi, A. Balestra, S. Bardelli, P. Battaglia, A. Biviano,
    E. Branchini, M. Brescia, S. Camera, G. Cañas-Herrera, V. Capobianco, C. Carbone,
    J. Carretero, M. Castellano, G. Castignani, S. Cavuoti, K.C. Chambers, A. Cimatti,
    C. Colodro-Conde, G. Congedo, L. Conversi, Y. Copin, F. Courbin, H.M. Courtois,
    M. Cropper, J.C. Cuillandre, H. Degaudenzi, G. De Lucia, C. Dolding, H. Dole,
    M. Douspis, F. Dubath, X. Dupac, S. Dusini, S. Escoffier, M. Farina, R. Farinelli,
    S. Ferriol, F. Finelli, N. Fourmanoit, M. Frailis, E. Franceschi, M. Fumana, S.
    Galeotta, K. George, B. Gillis, C. Giocoli, P. Gómez-Alvarez, J. Gracia-Carpio,
    A. Grazian, F. Grupp, L. Guzzo, S. Gwyn, S.V.H. Haugan, H. Hoekstra, W. Holmes,
    I.M. Hook, F. Hormuth, A. Hornstrup, M. Jhabvala, S. Kermiche, B. Kubik, K. Kuijken,
    M. Kümmel, M. Kunz, H. Kurki-Suonio, A.M.C. Le Brun, S. Ligori, P.B. Lilje, V.
    Lindholm, I. Lloro, G. Mainetti, D. Maino, E. Maiorano, O. Mansutti, O. Marggraf,
    M. Martinelli, N. Martinet, F. Marulli, R.J. Massey, H.J. Mccracken, E. Medinaceli,
    S. Mei, Y. Mellier, M. Meneghetti, E. Merlin, G. Meylan, J.J. Mohr, A. Mora, M.
    Moresco, L. Moscardini, E. Munari, R. Nakajima, C. Neissner, R.C. Nichol, S.M.
    Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W.J. Percival, V. Pettorino,
    S. Pires, G. Polenta, M. Poncet, L.A. Popa, L. Pozzetti, G.D. Racca, F. Raison,
    R. Rebolo, A. Renzi, J. Rhodes, G. Riccio, H.W. Rix, E. Romelli, M. Roncarelli,
    C. Rosset, B. Rusholme, R. Saglia, Z. Sakr, D. Sapone, M. Sauvage, M. Schirmer,
    P. Schneider, T. Schrabback, A. Secroun, G. Seidel, S. Serrano, E. Sihvola, P.
    Simon, C. Sirignano, G. Sirri, L. Stanco, J. Steinwagner, P. Tallada-Crespí, I.
    Tereno, N. Tessore, S. Toft, R. Toledo-Moreo, F. Torradeflot, I. Tutusaus, L.
    Valenziano, J. Valiviita, T. Vassallo, Y. Wang, J. Weller, F.M. Zerbi, E. Zucca,
    G. Fabbian, M. Huertas-Company, J. Martín-Fleitas, P. Monaco, V. Scottez, M. Viel,
    Astronomy and Astrophysics 711 (2026).
das_tickbox: '1'
dataavailabilitystatement: This work has made use of Euclid data from the European
  Space Agency (ESA) mission Euclid. The quasar cutouts are available at https://doi.org/10.57780/esa-50769fd.
  The discovery spectra are available from the corresponding author upon reasonable
  request.
date_created: 2026-10-04T22:01:54Z
date_published: 2026-07-01T00:00:00Z
date_updated: 2026-10-12T06:24:32Z
day: '01'
ddc:
- '520'
department:
- _id: JoMa
doi: 10.1051/0004-6361/202658883
external_id:
  arxiv:
  - '2607.03432'
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has_accepted_license: '1'
intvolume: '       711'
language:
- iso: eng
month: '07'
oa: 1
oa_version: Published Version
publication: Astronomy and Astrophysics
publication_identifier:
  eissn:
  - 1432-0746
  issn:
  - 0004-6361
publication_status: published
publisher: EDP Sciences
quality_controlled: '1'
researchdata_availability: no
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status: public
supplementarymaterial: yes
title: 'Euclid: Discovery of 31 new quasars at 6.6 < z < 7.8'
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 711
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...