Templates for Fitting Photometry of Ultra-high-redshift Galaxies
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- Steinhardt_2023_ApJL_951_L40
Final published version, 579 KB, PDF document
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.
Original language | English |
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Article number | L40 |
Journal | Astrophysical Journal Letters |
Volume | 951 |
Issue number | 2 |
Number of pages | 7 |
ISSN | 2041-8205 |
DOIs | |
Publication status | Published - 12 Jul 2023 |
Bibliographical note
Publisher Copyright:
© 2023. The Author(s). Published by the American Astronomical Society.
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