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- W4376163539 abstract "JWST observations have revealed a population of galaxies bright enough that potentially challenge standard galaxy formation models in the $Lambda$CDM cosmology. Using a minimal empirical framework, we investigate the influence of variability on the rest-frame ultra-violet (UV) luminosity function (UVLF) of galaxies at $zgeq 9$. Our study differentiates between the $textit{median UV radiation yield}$ and the $textit{variability of UV luminosities}$ of galaxies at a fixed dark matter halo mass. We primarily focus on the latter effect, which depends on halo assembly and galaxy formation processes and can significantly increase the abundance of UV-bright galaxies due to the upscatter of galaxies in lower-mass haloes. We find that a relatively low level of variability, $sigma_{rm UV} approx 0.75$ mag, matches the observational constraints at $zapprox 9$. However, increasingly larger $sigma_{rm UV}$ is necessary when moving to higher redshifts, reaching $sigma_{rm UV} approx 2.0,(2.5),{rm mag}$ at $zapprox 12$ ($16$). This implied variability is consistent with expectations of physical processes in high-redshift galaxies such as bursty star formation and cycles of dust clearance. Photometric constraints from JWST at $zgtrsim 9$ therefore can be reconciled with a standard $Lambda$CDM-based galaxy formation model calibrated at lower redshifts without the need for adjustments to the median UV radiation yield." @default.
- W4376163539 created "2023-05-12" @default.
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- W4376163539 date "2023-05-09" @default.
- W4376163539 modified "2023-10-16" @default.
- W4376163539 title "The impact of UV variability on the abundance of bright galaxies at $z geq 9$" @default.
- W4376163539 doi "https://doi.org/10.48550/arxiv.2305.05679" @default.
- W4376163539 hasPublicationYear "2023" @default.
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