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Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic Star-Formation Rate Density 300 Myr after the Big Bang

2023/12/15 by Brant Robertson, Benjamin D. Johnson, Robertson, Brant +77 · 1 voice · 27 citations
Physics and Astronomy · #Adaptive optics and wavefront sensing #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Galaxies: Formation, Evolution, Phenomena #Galaxy #Hubble Deep Field #Hubble Ultra-Deep Field #Luminosity #Luminosity function #Photometric redshift #Photometry (optics) #Physics #Population #Redshift #Star formation #Stars #astro-ph.CO #astro-ph.GA

paper · pdf · doi:10.48550/arxiv.2312.10033

published in arXiv (Cornell University) (Cornell University)

openalex publication_date 2023/12/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters spanning 0.4-0.9μm) and novel JWST images with 14 filters spanning 0.8-5μm, including 7 medium-band filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data at >2.3μm to construct an ultradeep image, reaching as deep as ≈31.4 AB mag in the stack and 30.3-31.0 AB mag (5σ, r=0.1" circular aperture) in individual filters. We measure photometric redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts z=11.5-15. These objects show compact half-light radii of R1/2∼50-200pc, stellar masses of M∼107-108 M\odot, and star-formation rates of SFR∼0.1-1 M\odot yr-1. Our search finds no candidates at 15

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