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Summary: We conduct a search for ultra-high-redshift galaxies (z > 9) using new post-launch calibrations and identify four candidate galaxies, including one at z = 11.5 and a possible pair of galaxies. However, the recovery rate for these candidates is low, with many being assigned lower redshifts in our work. Our analysis reveals evidence of Balmer-breaks and extreme emission lines, indicating advanced or very young stellar populations depending on the cause of the excess. The resolved structures of these early galaxies show a mixture of light concentration levels, with exceptionally small sizes (<0.5 kpc).
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(2023)
Article
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Charlotte A. Mason et al.
Summary: Recent JWST observations suggest an excess of z ? 10 galaxy candidates above most theoretical models. The properties and number densities of galaxies observed in the early Universe are affected by the interplay between halo formation time-scales, star formation efficiency, and dust attenuation. Theoretical calculations and modeling predict that the observed galaxies at z ? 10 are dominated by those with the fastest formation time-scales, extreme star formation rates, and young ages. Deeper JWST observations are expected to reveal more typical galaxies with relatively older ages and less extreme star formation rates.
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P. Santini et al.
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Astronomy & Astrophysics
Olmo Piana et al.
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Astronomy & Astrophysics
A. Ferrara et al.
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Article
Astronomy & Astrophysics
Yuichi Harikane et al.
Summary: This study presents new measurements of rest-UV luminosity functions and angular correlation functions of galaxies at redshifts around 2-7. The findings confirm previous studies and reveal the existence of a bright-end excess in the galaxy luminosity function, possibly attributed to inefficient mass quenching, low dust obscuration, and/or hidden AGN activity. Additionally, the study shows a weak redshift evolution in the ratio of star formation rate to dark matter accretion rate, which will be further tested by the James Webb Space Telescope.
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Astronomy & Astrophysics
P. Dayal et al.
Summary: This article presents the inclusion of metal and dust enrichment into a semi-analytic model of galaxy formation to explain the dust content of 13 LBGs detected at z similar or equal to 7. The study finds that the dust mass in galaxies is influenced by Type II supernova dust production, astration, shock destruction, and ejection in outflows, while grain growth plays a minor role. The model predicts a dust-to-stellar mass ratio and a UV-to-total star formation rate relation that align with observations. However, there are two systems that show significantly higher dust-to-stellar mass ratios, suggesting alternative solutions are needed.
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R. J. Bouwens et al.
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Steven L. Finkelstein et al.
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N. J. Adams et al.
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R. J. Bouwens et al.
Summary: This study provides the most comprehensive determinations of the galaxy's rest-frame UV luminosity function (LF) at z similar to 2-9 using the Hubble Space Telescope. The results show a smooth evolution trend in the UV LF from z similar to 10 to z similar to 2, indicating variations in the faint-end slope, characteristic luminosity, and normalization of the LF. These trends can be explained by the evolution of the halo mass function and a simple constant star formation efficiency model.
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