Probing Cosmic Dawn : Ages and Star Formation Histories of Candidate $z\geq$9 Galaxies
N. Laporte, R. A. Meyer, R. S. Ellis, B. E. Robertson, J. Chisholm,, and G. W. Roberts-Borsani

TL;DR
This study investigates the ages and star formation histories of candidate galaxies beyond redshift 9, using spectral energy distributions, stellar population models, and follow-up spectroscopy to understand early cosmic star formation.
Contribution
It provides new spectroscopic confirmations and detailed modeling of galaxies at redshifts above 9, extending knowledge of early star formation and galaxy evolution.
Findings
Confirmed redshifts of z=8.78 and z=9.28 for two galaxies.
Supported the existence of star formation activity beyond z=10.
Reconstructed past UV luminosities to trace early galaxy progenitors.
Abstract
We discuss the spectral energy distributions and physical properties of six galaxies whose photometric redshifts suggest they lie beyond a redshift 9. Each was selected on account of a prominent excess seen in the Spitzer/IRAC 4.5m band which, for a redshift above , likely indicates the presence of a rest-frame Balmer break and a stellar component that formed earlier than a redshift . In addition to constraining the earlier star formation activity on the basis of fits using stellar population models with BAGPIPES, we have undertaken the necessary, but challenging, follow-up spectroscopy for each candidate using various combinations of Keck/MOSFIRE, VLT/X-shooter, Gemini/FLAMINGOS2 and ALMA. Based on either Lyman- or [OIII] 88 m emission, we determine a convincing redshift of =8.78 for GN-z-10-3 and a likely redshift of =9.28 for the…
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