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The BoRG-JWST Survey: Program Overview and First Confirmations of Luminous Reionization-Era Galaxies from Pure-Parallel Observations
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The BoRG-JWST Survey: Program Overview and First Confirmations of Luminous Reionization-Era Galaxies from Pure-Parallel Observations

Guido Roberts-Borsani, Micaela Bagley, Sofía Rojas-Ruiz, Tommaso Treu, Takahiro Morishita, Steven L Finkelstein, Michele Trenti, Pablo Arrabal Haro, Eduardo Bañados, Óscar A. Chávez Ortiz, …
24/07/2024

摘要

Physics - Astrophysics of Galaxies
We present the BoRG-JWST survey, a combination of two JWST Cycle 1 programs aimed at obtaining NIRSpec spectroscopy of representative, UV-bright7<z<10galaxy candidates across 22 independent sight lines selected from Hubble/WFC3 pure-parallel observations. We confirm the high- znature of 10 out of 19 observed primary targets through low-resolution prism observations, with the rest revealing themselves unsurprisingly to bez∼1-3interlopers, brown dwarfs, or yielding inconclusive results. From the MSA observations, we confirm an additional 9 filler sources atz>5 , highlighting the large abundance of high-redshift galaxies even in individual WFC3 pointings. The primary sample span an absolute magnitude range-20.4<M_(\rm UV)<-22.4mag and harbour UV continuum slopes ofβ≃-2.5to-2.0 , representing some of the most luminousz>7sources currently known and comparable to the brightest sources atz>10 . Prominent [O III]+H βlines are found across the full sample, while a stack of sources reveals a plethora of other rest-optical lines and additional rest-UV C III]1909 A emission. Despite their luminosities, none of the low-resolution spectra display evidence for Type 1 AGN activity based on a search for broad-line emission. Lastly, we present a spectroscopic data release of 188 confirmed0.5≲ z≲5.0sources from filler MSA observations, highlighting the legacy value of the survey and a representative benchmark for comparisons to deep field observations.

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