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.

6 pages, 1 figure, Accepted for publication in MNRAS Letters

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• A survey of high-$z$ galaxies: SERRA simulations
• The ALMA REBELS Survey: Specific Star-Formation Rates in the Reionization Era
• Dust temperature in ALMA $\hbox{[C $\scriptstyle\rm II $]}$-detected high-$z$ galaxies
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• Predicting FIR lines from simulated galaxies
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• Dust attenuation evolution in $z\sim 2$-$12$ JWST galaxies
• Dust attenuation law in JWST galaxies at z = 7-8
• Structure and kinematics of a massive galaxy at z ~ 7
• The mass-metallicity relation as a ruler for galaxy evolution: insights from the James Webb Space Telescope
• The ALPINE-ALMA [CII] Survey: the population of [CII]-undetected galaxies and their role in the ${\mathrm{L}}_{[\mathrm{CII}]}$-SFR relation
• The interstellar medium of high-redshift galaxies: Gathering clues from C III] and [C II] lines
• Carbon envelopes around merging galaxies at z ~ 4.5
• Analytic models of dust temperature in high-redshift galaxies
• ALMA Lensing Cluster Survey: A spectral stacking analysis of [CII] in lensed $z\sim 6$ galaxies
• Ultra-faint [CII] emission in a redshift = 2 gravitationally-lensed metal-poor dwarf galaxy
• Amaryllis: a digital twin of the earliest galaxies in the Universe
• The early Universe with JWST and ALMA