2025/03/03 by Nicholas S. Martis, Martis, Nicholas, Sunna Withers +41 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Gamma-ray bursts and supernovae #Stellar, planetary, and galactic studies
paper · doi:10.48550/arxiv.2503.01579
openalex publication_date 2025/03/03 · openalex created_date 2025/10/19 · openalex updated_date 2026/07/28
We present a sample of 146 high-redshift (z>7.5) galaxies from the CANUCS/Technicolor surveys, showcasing photometry in every wide- and medium-band NIRCam filter in addition to ancillary HST data sampling 0.4-5 μm (22 JWST bands out of 29 bands total). Additionally, 48 (33%) galaxies in our sample meet criteria to be classified as extreme emission line galaxies, 15 (10%) of which are completely missed by typical dropout selections due to faint UV emission. By fitting the SEDs covering the rest-frame UV to optical at z > 7.5, we investigate the dust obscuration properties, giving an unbiased view of dust buildup in high-redshift galaxies free from spectroscopic follow-up selection effects. Dust attenuation correlates with stellar mass, but more strongly with star formation rate. We find typical galaxies at z>7.5 have ∼ 25 % of their star formation obscured. However, since galaxies with higher star formation rates suffer more attenuation, ∼ 50 % of the total star formation rate density at 7.5 15, implying that epoch as when dust first forms in bright galaxies.