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Simulated [CII] in high-z galaxies by Muñoz-Elgueta, N.; Battaia, F. Arrigoni; Kauffmann, G.; Pakmor, R.; Walch, S.; Obreja, A.; Buhlmann, L. is a scholarly article available to read on EtoBox.

What is Simulated [CII] in high-z galaxies about?

Extended [CII] emission on tens of kpc, also known as a [CII] halo, is being currently reported around z$\sim$4-6 star-forming galaxies, especially thanks to the statistics of the ALPINE survey. The [CII] emission is expected to trace dense cold gas in the inner CGM of these galaxies. The origin of this emission is still debated. In this paper, we present a post-processing model applied to Illustris-TNG50 star-forming galaxies at $z\sim$4-6, and we compare our results with the ALPINE observations. By incorporating C$^{+}$ abundances derived from UV background and young stars as radiation sources, we generate mock observations, from which we extract surface-brightness (SB) profiles. We found that our model predicts similar [CII] emission values on galactic scales as the observations, providing validation for our approach. However, we find that the predicted [CII] emission in the inner circumgalactic medium (CGM) falls below the observed values by a factor of $\sim$10. We discuss several model limitations that may contribute to this discrepancy. We also find discrepancies with observations when comparing SB profiles of low and high-SFR galaxies. Unlike the observations, simulations e

Author

Muñoz-Elgueta, N.; Battaia, F. Arrigoni; Kauffmann, G.; Pakmor, R.; Walch, S.; Obreja, A.; Buhlmann, L.

Published

2024

Language

EN