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Journal Articles The Astrophysical journal letters Year : 2022

A long time ago in a galaxy far, far away: A candidate z ~ 12 galaxy in early JWST CEERS imaging

Steven L. Finkelstein , Micaela B. Bagley , Pablo Arrabal Haro , Mark Dickinson , Henry C. Ferguson , Jeyhan S. Kartaltepe , Casey Papovich , Denis Burgarella (1) , Dale D. Kocevski , Marc Huertas-Company , Kartheik G. Iyer , Anton M. Koekemoer , Rebecca L. Larson , Pablo G. Pérez-González , Caitlin Rose , Sandro Tacchella , Stephen M. Wilkins , Katherine Chworowsky , Aubrey Medrano , Alexa M. Morales , Rachel S. Somerville , L. Y. Aaron Yung , Adriano Fontana , Mauro Giavalisco , Andrea Grazian , Norman A. Grogin , Lisa J. Kewley , Allison Kirkpatrick , Peter Kurczynski , Jennifer M. Lotz , Laura Pentericci , Nor Pirzkal , Swara Ravindranath , Russell E. Ryan , Jonathan R. Trump , Guang Yang , Omar Almaini , Ricardo O. Amorín , Marianna Annunziatella , Bren E. Backhaus , Guillermo Barro , Peter Behroozi , Eric F. Bell , Rachana Bhatawdekar , Laura Bisigello , Volker Bromm , Véronique Buat (1) , Fernando Buitrago , Antonello Calabrò , Caitlin M. Casey , Marco Castellano , Óscar A. Chávez Ortiz , Laure Ciesla (1) , Nikko J. Cleri , Seth H. Cohen , Justin W. Cole , Kevin C. Cooke , M. C. Cooper , Asantha R. Cooray , Luca Costantin , Isabella G. Cox , Darren Croton , Emanuele Daddi (2) , Romeel Davé , Alexander de La Vega , Avishai Dekel , David Elbaz (2) , Vicente Estrada-Carpenter , Sandra M. Faber , Vital Fernández , Keely D. Finkelstein , Jonathan Freundlich (3) , Seiji Fujimoto , Ángela García-Argumánez , Jonathan P. Gardner , Eric Gawiser , Carlos Gómez-Guijarro (2) , Yuchen Guo , Kurt Hamblin , Timothy S. Hamilton , Nimish P. Hathi , Benne W. Holwerda , Michaela Hirschmann , Taylor A. Hutchison , Anne E. Jaskot , Saurabh W. Jha , Shardha Jogee , Stéphanie Juneau , Intae Jung , Susan A. Kassin , Aurélien Le Bail (2) , Gene C. K. Leung , Ray A. Lucas , Benjamin Magnelli (2) , Kameswara Bharadwaj Mantha , Jasleen Matharu , Elizabeth J. Mcgrath , Daniel H. Mcintosh , Emiliano Merlin , Bahram Mobasher , Jeffrey A. Newman , David C. Nicholls , Viraj Pandya , Marc Rafelski , Kaila Ronayne , Paola Santini , Lise-Marie Seillé (1) , Ekta A. Shah , Lu Shen , Raymond C. Simons , Gregory F. Snyder , Elizabeth R. Stanway , Amber N. Straughn , Harry I. Teplitz , Brittany N. Vanderhoof , Jesús Vega-Ferrero , Weichen Wang , Benjamin J. Weiner , Christopher N. A. Willmer , Stijn Wuyts , Jorge A. Zavala
Steven L. Finkelstein
  • Function : Author
Micaela B. Bagley
  • Function : Author
Pablo Arrabal Haro
  • Function : Author
Mark Dickinson
  • Function : Author
Henry C. Ferguson
  • Function : Author
Jeyhan S. Kartaltepe
  • Function : Author
Casey Papovich
  • Function : Author
Dale D. Kocevski
  • Function : Author
Marc Huertas-Company
  • Function : Author
Kartheik G. Iyer
  • Function : Author
Anton M. Koekemoer
  • Function : Author
Rebecca L. Larson
  • Function : Author
Pablo G. Pérez-González
  • Function : Author
Caitlin Rose
  • Function : Author
Sandro Tacchella
  • Function : Author
Stephen M. Wilkins
  • Function : Author
Katherine Chworowsky
  • Function : Author
Aubrey Medrano
  • Function : Author
Alexa M. Morales
  • Function : Author
Rachel S. Somerville
  • Function : Author
L. Y. Aaron Yung
  • Function : Author
Adriano Fontana
  • Function : Author
Mauro Giavalisco
  • Function : Author
Andrea Grazian
  • Function : Author
Norman A. Grogin
  • Function : Author
Lisa J. Kewley
  • Function : Author
Allison Kirkpatrick
  • Function : Author
Peter Kurczynski
  • Function : Author
Jennifer M. Lotz
  • Function : Author
Laura Pentericci
  • Function : Author
Nor Pirzkal
  • Function : Author
Swara Ravindranath
  • Function : Author
Russell E. Ryan
  • Function : Author
Jonathan R. Trump
  • Function : Author
Guang Yang
  • Function : Author
Omar Almaini
  • Function : Author
Ricardo O. Amorín
  • Function : Author
Marianna Annunziatella
  • Function : Author
Bren E. Backhaus
  • Function : Author
Guillermo Barro
  • Function : Author
Peter Behroozi
  • Function : Author
Eric F. Bell
  • Function : Author
Rachana Bhatawdekar
  • Function : Author
Laura Bisigello
  • Function : Author
Volker Bromm
  • Function : Author
Fernando Buitrago
  • Function : Author
Antonello Calabrò
  • Function : Author
Caitlin M. Casey
  • Function : Author
Marco Castellano
  • Function : Author
Óscar A. Chávez Ortiz
  • Function : Author
Nikko J. Cleri
  • Function : Author
Seth H. Cohen
  • Function : Author
Justin W. Cole
  • Function : Author
Kevin C. Cooke
  • Function : Author
M. C. Cooper
  • Function : Author
Asantha R. Cooray
  • Function : Author
Luca Costantin
  • Function : Author
Isabella G. Cox
  • Function : Author
Darren Croton
  • Function : Author
Romeel Davé
  • Function : Author
Alexander de La Vega
  • Function : Author
Avishai Dekel
  • Function : Author
Vicente Estrada-Carpenter
  • Function : Author
Sandra M. Faber
  • Function : Author
Vital Fernández
  • Function : Author
Keely D. Finkelstein
  • Function : Author
Seiji Fujimoto
  • Function : Author
Ángela García-Argumánez
  • Function : Author
Jonathan P. Gardner
  • Function : Author
Eric Gawiser
  • Function : Author
Yuchen Guo
  • Function : Author
Kurt Hamblin
  • Function : Author
Timothy S. Hamilton
  • Function : Author
Nimish P. Hathi
  • Function : Author
Benne W. Holwerda
  • Function : Author
Michaela Hirschmann
  • Function : Author
Taylor A. Hutchison
  • Function : Author
Anne E. Jaskot
  • Function : Author
Saurabh W. Jha
  • Function : Author
Shardha Jogee
  • Function : Author
Stéphanie Juneau
  • Function : Author
Intae Jung
  • Function : Author
Susan A. Kassin
  • Function : Author
Gene C. K. Leung
  • Function : Author
Ray A. Lucas
  • Function : Author
Kameswara Bharadwaj Mantha
  • Function : Author
Jasleen Matharu
  • Function : Author
Elizabeth J. Mcgrath
  • Function : Author
Daniel H. Mcintosh
  • Function : Author
Emiliano Merlin
  • Function : Author
Bahram Mobasher
  • Function : Author
Jeffrey A. Newman
  • Function : Author
David C. Nicholls
  • Function : Author
Viraj Pandya
  • Function : Author
Marc Rafelski
  • Function : Author
Kaila Ronayne
  • Function : Author
Paola Santini
  • Function : Author
Ekta A. Shah
  • Function : Author
Lu Shen
  • Function : Author
Raymond C. Simons
  • Function : Author
Gregory F. Snyder
  • Function : Author
Elizabeth R. Stanway
  • Function : Author
Amber N. Straughn
  • Function : Author
Harry I. Teplitz
  • Function : Author
Brittany N. Vanderhoof
  • Function : Author
Jesús Vega-Ferrero
  • Function : Author
Weichen Wang
  • Function : Author
Benjamin J. Weiner
  • Function : Author
Christopher N. A. Willmer
  • Function : Author
Stijn Wuyts
  • Function : Author
Jorge A. Zavala
  • Function : Author

Abstract

We report the discovery of a candidate galaxy with a photo-z of z ~ 12 in the first epoch of the James Webb Space Telescope (JWST) Cosmic Evolution Early Release Science Survey. Following conservative selection criteria, we identify a source with a robust z phot = ${11.8}_{-0.2}^{+0.3}$ (1σ uncertainty) with m F200W = 27.3 and ≳7σ detections in five filters. The source is not detected at λ < 1.4 μm in deep imaging from both Hubble Space Telescope (HST) and JWST and has faint ~3σ detections in JWST F150W and HST F160W, which signal a Lyα break near the red edge of both filters, implying z ~ 12. This object (Maisie's Galaxy) exhibits F115W - F200W > 1.9 mag (2σ lower limit) with a blue continuum slope, resulting in 99.6% of the photo-z probability distribution function favoring z > 11. All data-quality images show no artifacts at the candidate's position, and independent analyses consistently find a strong preference for z > 11. Its colors are inconsistent with Galactic stars, and it is resolved (r h = 340 ± 14 pc). Maisie's Galaxy has log M */M ~ 8.5 and is highly star-forming (log sSFR ~ -8.2 yr-1), with a blue rest-UV color (β ~ -2.5) indicating little dust, though not extremely low metallicity. While the presence of this source is in tension with most predictions, it agrees with empirical extrapolations assuming UV luminosity functions that smoothly decline with increasing redshift. Should follow-up spectroscopy validate this redshift, our universe was already aglow with galaxies less than 400 Myr after the Big Bang.
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insu-03894338 , version 1 (12-12-2022)

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Steven L. Finkelstein, Micaela B. Bagley, Pablo Arrabal Haro, Mark Dickinson, Henry C. Ferguson, et al.. A long time ago in a galaxy far, far away: A candidate z ~ 12 galaxy in early JWST CEERS imaging. The Astrophysical journal letters, 2022, 940, pp.L55. ⟨10.3847/2041-8213/ac966e⟩. ⟨insu-03894338⟩
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