The UNCOVER Survey: A First-look HST+JWST Catalog of Galaxy Redshifts and Stellar Population Properties Spanning 0.2 ≲ z ≲ 15
arxiv(2023)
摘要
The recent UNCOVER survey with the James Webb Space Telescope (JWST) exploits
the nearby cluster Abell 2744 to create the deepest view of our universe to
date by leveraging strong gravitational lensing. In this work, we perform
photometric fitting of more than 50,000 robustly detected sources out to z
∼ 15. We show the redshift evolution of stellar ages, star formation rates,
and rest-frame colors across the full range of 0.2 ≲ z ≲ 15.
The galaxy properties are inferred using the Prospector Bayesian inference
framework using informative Prospector-β priors on masses and star
formation histories to produce joint redshift and stellar population
posteriors, and additionally lensing magnification is performed on-the-fly to
ensure consistency with the scale-dependent priors. We show that this approach
produces excellent photometric redshifts with σ_ NMAD∼ 0.03, of
a similar quality to the established photometric redshift code EAzY. In line
with the open-source scientific objective of the Treasury survey, we publicly
release the stellar population catalog with this paper, derived from the
photometric catalog adapting aperture sizes based on source profiles. This
release includes posterior moments, maximum-likelihood spectra, star-formation
histories, and full posterior distributions, offering a rich data set to
explore the processes governing galaxy formation and evolution over a parameter
space now accessible by JWST.
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