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• W4313706652 endingPage "5881" @default.
• W4313706652 startingPage "5859" @default.
• W4313706652 abstract "The variety of star formation histories (SFHs) of $zgtrsim6$ galaxies provides important insights into early star formation, but has been difficult to systematically quantify. Some observations suggest that many $zsim6-9$ galaxies are dominated by $gtrsim200$ Myr stellar populations, implying significant star formation at $zgtrsim9$, while others find that most reionization era galaxies are $lesssim10$ Myr, consistent with little $zgtrsim9$ star formation. Here, we quantify the distribution of ages of UV-bright ($-22.5lesssim M_{UV}lesssim-21$) galaxies colour-selected to lie at $zsimeq6.6-6.9$, an ideal redshift range to systematically study the SFHs of reionization era galaxies with ground-based observatories and Spitzer. We infer galaxy properties with two SED modelling codes and compare results, finding that stellar masses are largely insensitive to the model, but the inferred ages can vary by an order of magnitude. We infer a distribution of ages assuming a simple, parametric SFH model, finding a median age of $sim30-70$ Myr depending on SED model. We quantify the fractions of $leq10$ Myr and $geq250$ Myr galaxies, finding that these systems comprise $sim15-30$ percent and $sim20-25$ percent of the population, respectively. With a flexible SFH model, the shapes of the SFHs are consistent with those implied by the simple model (e.g. young galaxies have rapidly rising SFHs). However, stellar masses can differ significantly, with those of young systems sometimes being more than an order of magnitude larger with the flexible SFH. We quantify the implications of these results for $zgtrsim9$ stellar mass assembly and discuss improvements expected from JWST." @default.
• W4313706652 created "2023-01-08" @default.
• W4313706652 creator A5028442373 @default.
• W4313706652 creator A5035756480 @default.
• W4313706652 creator A5053667167 @default.
• W4313706652 creator A5065110134 @default.
• W4313706652 creator A5083229179 @default.
• W4313706652 creator A5083991070 @default.
• W4313706652 date "2023-01-05" @default.
• W4313706652 modified "2023-10-09" @default.
• W4313706652 title "Star formation histories of UV-luminous galaxies at <i>z</i> ≃ 6.8: implications for stellar mass assembly at early cosmic times" @default.
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