Even redder than we knew: color and evolution up to from JWST/NIRCam photometry
arXiv:2506.23669 · doi:10.1051/0004-6361/202555488
Abstract
JWST/NIRCam provides rest-frame near-IR photometry of galaxies up to with exquisite depth and accuracy. This affords an unprecedented view of the evolution of the UV-optical-near-IR color distribution and its interpretation in terms of the evolving dust attenuation, . We use the value-added data products (photometric redshift, stellar mass, rest-frame and colors, and ) provided by the public DAWN JWST Archive. This data product derives from fitting the spectral energy distributions obtained from multiple NIRCam imaging surveys, augmented with pre-existing HST imaging data. Our sample consists of a stellar mass complete sample of galaxies in the redshift range . The color distribution of star-forming galaxies evolves strongly, in particular for high-mass galaxies (), which have a pronounced tail of very red galaxies reaching at that does not exist at . Such red can only be explained by dust attenuation, with typical values for galaxies in the range at . This redshift evolution went largely unnoticed before because the photometric redshift estimates for the reddest (), most attenuated galaxies has markedly improved thanks to the new, precise photometry. Despite the increased attenuation, colors across the entire mass range are slightly bluer at higher . In conclusion, whereas the rest-frame UV-optical color distribution evolves remarkably little from to , the rest-frame optical-near-IR color distribution evolves strongly, primarily due to a very substantial increase with redshift in dust attenuation for massive galaxies. (Abbr.)
arXiv commentAccepted for publication in A&A. This second version has minor corrections to adhere to A&A style
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