Unveiling the contribution of Pop III stars in primeval galaxies at redshift $\ge 6$

Abstract

Detection of the first stars has remained elusive so-far but their presence may soon be unveiled by upcoming JWST observations. Previous studies have not investigated the entire possible range of halo masses and redshifts which may help in their detection. Motivated by the prospects of detecting galaxies up to $z\sim 20$ in JWST early data release, we quantify the contribution of Pop III stars to high-redshift galaxies from $6\le z\le 30$ by employing the semi-analytical model A-SLOTH, which self-consistently models the formation of Pop III and Pop II stars along with their feedback. Our results suggest that the contribution of Pop III stars is the highest in low-mass halos of $10^7-10^9{\mathrm{M}}_{\odot }$. While high-mass halos $\ge 10^{10}{\mathrm{M}}_{\odot }$ contain less than 1\% Pop III stars, they host galaxies with stellar masses of $10^9{\mathrm{M}}_{\odot }$ as early as $z\sim 30$. Interestingly, the apparent magnitude of Pop~III populations gets brighter towards higher redshift due to the higher stellar masses, but Pop~III-dominated galaxies are too faint to be directly detected with JWST. Our results predict JWST can detect galaxies up to $z\sim 30$, which may help in constraining the IMF of Pop III stars and will guide observers to discern the contribution of Pop~III stars to high-redshift galaxies.

Accepted for publication in ApJL, comments are still welcome

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• Constraining the physical properties of the first lensed $z\sim 10-16$ galaxy candidates with JWST
• A needle in a haystack? Catching Pop III stars in the Epoch of Reionization: I. Pop III star forming environments
• Machine learning detects multiplicity of the first stars in stellar archaeology data
• A-SLOTH reveals the nature of the first stars
• Gravitational waves from mergers of Population III binary black holes: roles played by two evolution channels
• Efficiency of black hole formation via collisions in stellar systems: An analysis of data from simulations and observations
• Effects of chemically homogeneous evolution of the first stars on the 21-cm signal and reionization
• Simulating the collapse of rotating primordial gas clouds to study the survival possibility of Pop III protostars
• Detailed Abundance Determination of Metal-Poor Stars with X-Shooter I. Unusual Chemistry in Halo Stars