Templates for Fitting Photometry of Ultra-high-redshift Galaxies
Publikation: Bidrag til tidsskrift › Letter › Forskning › fagfællebedømt
Dokumenter
- Steinhardt_2023_ApJL_951_L40
Forlagets udgivne version, 579 KB, PDF-dokument
Recent data from the James Webb Space Telescope allow a first glimpse of galaxies at z ≳ 11. The most successful tool for identifying ultra-high-redshift candidates and inferring their properties is photometric template fitting. However, current methods rely on templates derived from much lower-redshift conditions, including stellar populations older than the age of the Universe at z > 12, a stellar initial mass function that is physically disallowed at z > 6, and weaker emission lines than currently observed at z > 7.5. Here, two sets of synthetic templates, optimized for the expected astrophysics of galaxies at 8 < z < 12 and z > 12, are developed and used to fit three galaxies at z > 12 from the SMACS0723 field. Using these improved templates, quantitative estimates are produced of the bias in inferred properties from JWST observations at z > 8 due to these effects. The best-fit redshifts are similar to those found with previous template sets, but the inferred stellar masses drop by as much as 1-1.6 dex, such that stellar masses are no longer seemingly inconsistent with ΛCDM. The two new template sets are released in formats compatible with EAZY and LePhare.
Originalsprog | Engelsk |
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Artikelnummer | L40 |
Tidsskrift | Astrophysical Journal Letters |
Vol/bind | 951 |
Udgave nummer | 2 |
Antal sider | 7 |
ISSN | 2041-8205 |
DOI | |
Status | Udgivet - 12 jul. 2023 |
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