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  4. CAPERS Observations of Two UV-bright Galaxies at z > 10. More Evidence for Bursting Star Formation in the Early Universe
 
research article

CAPERS Observations of Two UV-bright Galaxies at z > 10. More Evidence for Bursting Star Formation in the Early Universe

Kokorev, Vasily
•
Chávez Ortiz, Óscar A.
•
Taylor, Anthony J.
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July 20, 2025
Astrophysical Journal Letters

We present the first results from the CANDELS-Area Prism Epoch of Reionization Survey (CAPERS), utilizing PRISM observations with the JWST/NIRSpec microshutter assembly in the PRIMER-UDS field. With just 14% of the total planned data volume, we spectroscopically confirm two new bright galaxies (MUV ∼ −20.4) at redshifts z = 10.562 ± 0.034 and z = 11.013 ± 0.028. We examine their physical properties, morphologies, and star formation histories, finding evidence for recent bursting star formation in at least one galaxy thanks to the detection of strong rest-frame equivalent width (EW0 ∼ 70 Å) Hγ emission. Combining our findings with previous studies of similarly bright objects at high z, we further assess the role of stochastic star formation processes in shaping early galaxy populations. Our analysis finds that the majority of bright (MUV ≲ −20) spectroscopically confirmed galaxies at z > 10 were likely observed during a starburst episode, characterized by a median star formation rate (SFR) ratio of SFR10/SFR100 ∼ 2, although with substantial scatter of 0.24 dex. Our work also finds tentative evidence that z > 10 galaxies are more preferentially in a bursting phase than similarly bright z ∼ 6 galaxies. We finally discuss the prospects of deeper spectroscopic observations of a statistically significant number of bright galaxies to quantify the true impact of bursting star formation on the evolution of the bright end of the UV luminosity function at these early epochs.

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Type
research article
DOI
10.3847/2041-8213/ade8f5
Scopus ID

2-s2.0-105010924685

Author(s)
Kokorev, Vasily

The University of Texas at Austin

Chávez Ortiz, Óscar A.

The University of Texas at Austin

Taylor, Anthony J.

The University of Texas at Austin

Finkelstein, Steven L.

The University of Texas at Austin

Arrabal Haro, Pablo

NASA Goddard Space Flight Center

Dickinson, Mark

NOIRLab

Chisholm, John

The University of Texas at Austin

Fujimoto, Seiji

The University of Texas at Austin

Noz, Julian B.Mu

The University of Texas at Austin

Endsley, Ryan

The University of Texas at Austin

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Date Issued

2025-07-20

Published in
Astrophysical Journal Letters
Volume

988

Issue

1

Article Number

L10

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GALSPEC  
FunderFunding(s)Grant NumberGrant URL

University of Texas at Austin Cosmic Frontier Center

CSA

ESA

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Available on Infoscience
July 29, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/252715
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