Date: 3/7/2024
Arxiv: EPOCHS IV: SED Modelling Assumptions and their impact on the Stellar
Mass Function at 6.5 < z < 13.5 using PEARLS and public JWST observations
Published: 3/6/2024 8:14:21 PM
Updated: 3/6/2024 8:14:21 PM
Paper abstract: We utilize deep JWST NIRCam observations for the first direct constraints onthe Galaxy Stellar Mass Function (GSMF) at z>10. Our EPOCHS v1 sample includes1120 galaxy candidates at 6.5 9 than some studies predict, suggesting a rapid buildup ofstellar mass in the early Universe. We find no incompatibility between ourresults and those of standard cosmological models, as suggested previously,although the most massive galaxies may require a high star formationefficiency. We find that the 'Little Red Dot' galaxies dominate the z=7 GSMF athigh-masses, necessitating a better understanding of the relative contributionsof AGN and stellar emission. We show that assuming a theoretically motivatedtop-heavy IMF reduces stellar mass by 0.5 dex without affecting fit quality,but our results remain consistent with existing cosmological models with astandard IMF.
