The BoRG-JWST Survey: Program Overview and First Confirmations of Luminous Reionization-Era Galaxies from Pure-Parallel Observations
Guido Roberts-Borsani, Micaela Bagley, Sof\'ia Rojas-Ruiz, Tommaso, Treu, Takahiro Morishita, Steven L. Finkelstein, Michele Trenti, Pablo, Arrabal Haro, Eduardo Ba\~nados, \'Oscar A. Ch\'avez Ortiz, Katherine, Chworowsky, Taylor A. Hutchison, Rebecca L. Larson

TL;DR
The BoRG-JWST survey confirms the existence of luminous reionization-era galaxies at redshifts 7-10, providing spectroscopic data and revealing their properties, including strong emission lines and absence of AGN activity, across multiple sight lines.
Contribution
This study presents the first spectroscopic confirmations of luminous $z>7$ galaxies from JWST pure-parallel observations, expanding knowledge of early universe galaxy populations.
Findings
Confirmed 10 high-$z$ galaxies out of 19 targets.
Detected prominent rest-optical emission lines across the sample.
Provided a large spectroscopic dataset of 188 sources from filler observations.
Abstract
We present the BoRG-JWST survey, a combination of two JWST Cycle 1 programs aimed at obtaining NIRSpec spectroscopy of representative, UV-bright galaxy candidates across 22 independent sight lines selected from Hubble/WFC3 pure-parallel observations. We confirm the high- nature of 10 out of 19 observed primary targets through low-resolution prism observations, with the rest revealing themselves unsurprisingly to be interlopers, brown dwarfs, or yielding inconclusive results. From the MSA observations, we confirm an additional 9 filler sources at , highlighting the large abundance of high-redshift galaxies even in individual WFC3 pointings. The primary sample span an absolute magnitude range mag and harbour UV continuum slopes of to , representing some of the most luminous sources currently known and…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Astronomical Observations and Instrumentation · Gamma-ray bursts and supernovae
