Star formation law in the EoR from [CII] and CIII] lines

Abstract

We present a novel method to simultaneously characterise the star formation law and the interstellar medium properties of galaxies in the Epoch of Reionization (EoR) through the combination of [CII] 158$\mu$m (and its known relation with star formation rate) and CIII]$\lambda$1909Å emission line data. The method, based on a Markov Chain Monte Carlo algorithm, allows to determine the target galaxy average density, $n$, gas metallicity, $Z$, and burstiness parameter, ${\kappa }_s$, quantifying deviations from the Kennicutt-Schmidt relation. As an application, we consider COS-3018 (z=6.854), the only EoR Lyman Break Galaxy so far detected in both [CII] and CIII]. We show that COS-3018 is a moderate starburst (${\kappa }_s\approx 3$), with $Z\approx 0.4Z_{\odot }$, and $n\approx 500\mathrm{c}{\mathrm{m}}^{-3}$. Our method will be optimally applied to joint ALMA and JWST targets.

arXiv comment6 pages, 1 figure, Accepted for publication in MNRAS Letters

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