Early Results from GLASS-JWST. XVII. Building the First Galaxies-Chapter 1. Star Formation Histories for 5 < z < 7 Galaxies
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- Dressler_2023_ApJL_947_L27
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The JWST observations of high-redshift galaxies are used to measure their star formation histories-the buildup of stellar mass in the earliest galaxies. Here we use a novel analysis program, SEDz*, to compare near-IR spectral energy distributions for galaxies with redshifts 5 < z < 7 to combinations of stellar population templates evolved from z = 12. We exploit NIRCam imaging in seven wide bands covering 1-5 mu m taken in the context of the GLASS-JWST-ERS program and use SEDz* to solve for well-constrained star formation histories for 24 exemplary galaxies. In this first look, we find a variety of histories, from long, continuous star formation over 5 < z < 12 to short but intense starbursts, sometimes repeating, and, most commonly, contiguous mass buildup lasting similar to 0.5 Myr, possibly the seeds of today's typical M* galaxies.
Originalsprog | Engelsk |
---|---|
Artikelnummer | 27 |
Tidsskrift | Astrophysical Journal Letters |
Vol/bind | 947 |
Udgave nummer | 2 |
Antal sider | 15 |
ISSN | 2041-8205 |
DOI | |
Status | Udgivet - 1 apr. 2023 |
ID: 355088823