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  4. Unveiling the Distant Universe: Characterizing z ≥ 9 Galaxies in the First Epoch of COSMOS-Web
 
research article

Unveiling the Distant Universe: Characterizing z ≥ 9 Galaxies in the First Epoch of COSMOS-Web

Franco, Maximilien
•
Akins, Hollis B.
•
Casey, Caitlin M.
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September 1, 2024
The Astrophysical Journal

We report the identification of 15 galaxy candidates at z ≥ 9 using the initial COSMOS-Web JWST observations over 77 arcmin2 through four Near Infrared Camera filters (F115W, F150W, F277W, and F444W) with an overlap with the Mid-Infrared Imager (F770W) of 8.7 arcmin2. We fit the sample using several publicly available spectral energy distribution (SED) fitting and photometric redshift codes and determine their redshifts between z = 9.3 and z = 10.9 (〈z〉 = 10.0), UV magnitudes between M UV = −21.2 and −19.5 (with 〈M UV〉 = −20.2), and rest-frame UV slopes (〈β〉 = −2.4). These galaxies are, on average, more luminous than most z ≥ 9 candidates discovered by JWST so far in the literature, while exhibiting similar blue colors in their rest-frame UV. The rest-frame UV slopes derived from SED fitting are blue (β ∼ [−2.0, −2.7]) without reaching extremely blue values as reported in other recent studies at these redshifts. The blue color is consistent with models that suggest the underlying stellar population is not yet fully enriched in metals like similarly luminous galaxies in the lower-redshift Universe. The derived stellar masses with 〈 log 10 ( M ⋆/M ⊙)〉 ≈ 8-9 are not in tension with the standard Lambda cold dark matter (ΛCDM) model, and our measurement of the volume density of such UV-luminous galaxies aligns well with previously measured values presented in the literature at z ∼ 9-10. Our sample of galaxies, although compact, is significantly resolved.

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Type
research article
DOI
10.3847/1538-4357/ad5e6a
Scopus ID

2-s2.0-85203982891

Author(s)
Franco, Maximilien

The University of Texas at Austin

Akins, Hollis B.

The University of Texas at Austin

Casey, Caitlin M.

The University of Texas at Austin

Finkelstein, Steven L.

The University of Texas at Austin

Shuntov, Marko

Cosmic Dawn Center

Chworowsky, Katherine

The University of Texas at Austin

Faisst, Andreas L.

California Institute of Technology

Fujimoto, Seiji

The University of Texas at Austin

Ilbert, Olivier

Laboratoire d'Astrophysique de Marseille

Koekemoer, Anton M.

Space Telescope Science Institute

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Date Issued

2024-09-01

Published in
The Astrophysical Journal
Volume

973

Issue

1

Article Number

23

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GALSPEC  
FunderFunding(s)Grant NumberGrant URL

Centre National d’Etudes Spatiales

Sandro Tacchella

University of Texas at Austin

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Available on Infoscience
January 24, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/243848
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