Journal Articles The Astrophysical Journal Year : 2023

ALMA FIR View of Ultra High-redshift Galaxy Candidates at $z\sim$ 11-17: Blue Monsters or Low-$z$ Red Interlopers?

Seiji Fujimoto
  • Function : Author
Steven L. Finkelstein
  • Function : Author
Chris L. Carilli
  • Function : Author
Caitlin M. Casey
  • Function : Author
Sandro Tacchella
  • Function : Author
Jorge A. Zavala
  • Function : Author
Gabriel Brammer
  • Function : Author
Yoshinobu Fudamoto
  • Function : Author
Masami Ouchi
  • Function : Author
Francesco Valentino
  • Function : Author
M.C. Cooper
  • Function : Author
Mark Dickinson
  • Function : Author
Maximilien Franco
  • Function : Author
Mauro Giavalisco
  • Function : Author
Taylor A. Hutchison
  • Function : Author
Jeyhan S. Kartaltepe
  • Function : Author
Anton M. Koekemoer
  • Function : Author
Takashi Kojima
  • Function : Author
Rebecca L. Larson
  • Function : Author
E.J. Murphy
  • Function : Author
Casey Papovich
  • Function : Author
Pablo G. Perez-Gonzalez
  • Function : Author
Rachel S. Somerville
  • Function : Author
Ilsang Yoon
  • Function : Author
Stephen M. Wilkins
  • Function : Author
L.Y. Aaron Yung
  • Function : Author
Hollis Akins
  • Function : Author
Ricardo O. Amorín
  • Function : Author
Pablo Arrabal Haro
  • Function : Author
Micaela B. Bagley
  • Function : Author
Katherine Chworowsky
  • Function : Author
Olivia R. Cooper
  • Function : Author
Luca Costantin
  • Function : Author
Henry C. Ferguson
  • Function : Author
Norman A. Grogin
  • Function : Author
E.F. Jimenez-Andrade
  • Function : Author
Stephanie Juneau
  • Function : Author
Allison Kirkpatrick
  • Function : Author
Dale D. Kocevski
  • Function : Author
Aurelien Le Bail
Arianna Long
  • Function : Author
Ray A. Lucas
  • Function : Author
Jed Mckinney
  • Function : Author
Caitlin Rose
  • Function : Author
Raymond C. Simons
  • Function : Author
Benjamin J. Weiner
  • Function : Author

Abstract

We present ALMA Band 7 observations of a remarkably bright galaxy candidate at $z_{\rm phot}$=$16.7^{+1.9}_{-0.3}$ ($M_{\rm UV}$=$-21.6$), S5-z17-1, identified in JWST Early Release Observation data of Stephen's Quintet. We do not detect the dust continuum at 866 $\mu$m, ruling out the possibility that S5-z17-1 is a low-$z$ dusty starburst with a star-formation rate (SFR) of $\gtrsim 30\,M_{\odot}$ yr$^{-1}$. We detect a 5.1$\sigma$ line feature at $338.726\pm0.007$ GHz exactly coinciding with the JWST source position, with a 2% likelihood of the signal being spurious. The most likely line identification would be [OIII]52$\mu$m at $z=16.01$ or [CII]158$\mu$m at $z=4.61$, whose line luminosities do not violate the non-detection of the dust continuum in both cases. Together with three other $z\gtrsim$ 11-13 candidate galaxies recently observed with ALMA, we conduct a joint ALMA and JWST spectral energy distribution (SED) analysis and find that the high-$z$ solution at $z\sim$11-17 is favored in every candidate as a very blue (UV continuum slope of $\approx-2.3$) and luminous ($M_{\rm UV}$ $\approx$ [$-$24:$-$21]) system. Still, we find in some candidates that reasonable SED fits ($\Delta$ $\chi^{2}\lesssim4$) are reproduced by type-II quasar and/or quiescent galaxy templates with strong emission lines at $z\sim3$-5, where such populations predicted from their luminosity functions and EW([OIII]+H$\beta$) distributions are abundant in survey volumes used for the $z\sim$11-17 candidates. While these recent ALMA observation results have strengthened the likelihood of the high-$z$ solutions, lower-$z$ possibilities are not completely ruled out in some of the $z\sim$11-17 candidates.
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hal-03866343 , version 1 (19-01-2025)

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Seiji Fujimoto, Steven L. Finkelstein, Denis Burgarella, Chris L. Carilli, Veronique Buat, et al.. ALMA FIR View of Ultra High-redshift Galaxy Candidates at $z\sim$ 11-17: Blue Monsters or Low-$z$ Red Interlopers?. The Astrophysical Journal, 2023, 955 (2), pp.130. ⟨10.3847/1538-4357/aceb67⟩. ⟨hal-03866343⟩
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