articleMonthly Notices of the Royal Astronomical SocietyNov 18, 2022HYBRID OA

Discovery and properties of ultra-high redshift galaxies (9 < z < 12) in the JWST ERO SMACS 0723 Field

NANathan AdamsCJChristopher J. ConseliceLFLeonardo FerreiraDADuncan AustinJTJames Trussler

University of Manchester · University of Nottingham · +6 more institutions

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Abstract

ABSTRACT We present a reduction and analysis of the James Webb Space Telescope (JWST) SMACS 0723 field using new post-launch calibrations to conduct a search for ultra-high-redshift galaxies (z > 9) present within the Epoch of Reionization. We conduct this search by modelling photometric redshifts in several ways for all sources and by applying conservative magnitude cuts (mF200W < 28) to identify strong Lyman breaks greater than 1 mag. We find four z > 9 candidate galaxies which have not previously been identified, with one object at z = 11.5, and another which is possibly a close pair of galaxies. We measure redshifts for candidate galaxies from other studies and find the recovery rate…

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Topics & keywords

Topics
Keywords
  • Physics
  • Astrophysics
  • Redshift
  • Galaxy
  • James Webb Space Telescope
  • Astronomy
  • Stellar mass
  • Star formation
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