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Dust attenuation evolution in $z \sim 2$-$12$ JWST galaxies
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abstract
A sizable fraction of the heavy elements synthesized by stars in galaxies condenses into sub-micron-sized solid-state particles, known as dust grains. Dust produces a wavelength-dependent attenuation, $A_\lambda$, of the galaxy emission, thereby significantly altering its observed properties. Locally, $A_\lambda$ is in general the sum of a power-law and a UV feature ('bump') produced by small, carbon-based grains. However, scant information exists regarding its evolution across cosmic time. Here, leveraging data from 173 galaxies observed by the James Webb Space Telescope in the redshift range z = 2 - 12, we report the most distant detection of the UV bump in a z ~ 7.55 galaxy (when the Universe was only ~ 700 Myr old), and show for the first time that the power-law slope and the bump strength decrease towards high redshifts. We propose that the flat $A_\lambda$ shape at early epochs is produced by large grains newly formed in supernova ejecta, which act as the main dust factories at such early epochs. Importantly, these grains have undergone minimal reprocessing in the interstellar medium due to the limited available cosmic time. This discovery opens new perspectives in the study of cosmic dust origin and evolution.
Forward citations
Cited by 8 Pith papers
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The COLIBRE-SKIRT pipeline reproduces the observed low-redshift cosmic SED without calibrating the post-processing, using live dust from the simulation and a new 'split & scale' grain-size mapping.
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Evolution of galaxy attenuation curves driven by evolving dust mass and grain size distributions
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Deep Swift/UVOT Observations of GOODS-N and the Evolution of the Ultraviolet Luminosity Function at 0.2<z<1.2
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A compact galaxy at z=8.63 hosts a 100-million-solar-mass accreting black hole with broad H-beta, high-ionization UV lines, and very low metallicity.
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The resolved correlation between the 2175 Å dust bump and PAH abundance in 15 nearby galaxies mostly vanishes after controlling for star-formation surface density, disfavouring PAHs as the direct carrier of the bump.
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Dust emission from the bulk of galaxies at the Epoch of Reionization
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