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Unveiling the distant Universe: Characterizing
z
β₯
9
z\ge9
z
β₯
9
Galaxies in the first epoch of COSMOS-Web
Authors
Hollis B. Akins
Micaela B. Bagley
+48Β more
Caitlin M. Casey
Jaclyn B. Champagne
Katherine Chworowsky
Olivia R. Cooper
Xuheng Ding
Nicole E. Drakos
Andrea Enia
Andreas L. Faisst
Steven L. Finkelstein
Maximilien Franco
Seiji Fujimoto
Steven Gillman
Ghassem Gozaliasl
Santosh Harish
Christopher C. Hayward
Michaela Hirschmann
Olivier Ilbert
Shuowen Jin
Jeyhan S. Kartaltepe
Anton M. Koekemoer
Vasily Kokorev
Clotilde Laigle
Daizhong Liu
Arianna S. Long
Christopher C. Lovell
Georgios Magdis
Guillaume Mahler
Claudia Maraston
Crystal L. Martin
Henry Joy McCracken
Jed McKinney
Bahram Mobasher
Louise Paquereau
Alvio Renzini
Jason Rhodes
R. Michael Rich
Brant E. Robertson
Kartik Sheth
Marko Shuntov
John D. Silverman
Martin Sparre
Margherita Talia
Benny Trakhtenbrot
Francesco Valentino
Aswin P. Vijayan
Stephen M. Wilkins
Lilan Yang
Jorge A. Zavala
Publication date
1 August 2023
Publisher
View
on
arXiv
Abstract
We report the identification of 15 galaxy candidates at
z
β₯
9
z\ge9
z
β₯
9
using the initial COSMOS-Web JWST observations over 77 arcmin
2
^2
2
through four NIRCam filters (F115W, F150W, F277W, F444W) with an overlap with MIRI (F770W) of 8.7 arcmin
2
^2
2
. We fit the sample using several publicly-available SED fitting and photometric redshift codes and determine their redshifts between
z
=
9.3
z=9.3
z
=
9.3
and
z
=
10.9
z=10.9
z
=
10.9
(
β¨
z
β©
=
10.0
\langle z\rangle=10.0
β¨
z
β©
=
10.0
), UV-magnitudes between M
U
V
_{\rm UV}
UV
β
=
β
-
β
21.2 and
β
-
β
19.5 (with
β¨
\langle
β¨
M
U
V
β©
=
β
20.2
_{\rm UV}\rangle=-20.2
UV
β
β©
=
β
20.2
) and rest-frame UV slopes (
β¨
Ξ²
β©
=
β
2.4
\langle \beta\rangle=-2.4
β¨
Ξ²
β©
=
β
2.4
). These galaxies are, on average, more luminous than most
z
β₯
9
z\ge9
z
β₯
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 (
Ξ²
βΌ
\beta\sim
Ξ²
βΌ
[
β
-
β
2.0,
β
-
β
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
β¨
log
β‘
10
(
\langle \log_{\rm 10} (
β¨
lo
g
10
β
(
M
β
/
_\star/
β
β
/
M
β
)
β©
β
8
β
9
_\odot)\rangle\approx8-9
β
β
)β©
β
8
β
9
are not in tension with the standard
Ξ
\Lambda
Ξ
CDM 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
βΌ
9
β
10
z\sim9-10
z
βΌ
9
β
10
. Our sample of galaxies, although compact, are significantly resolved.Comment: Submitted to Ap
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Last time updated on 06/08/2023