# On the star formation efficiency in high redshift Lyman-{\alpha} emitters

## TL;DR

This paper models high-redshift Lyman-alpha emitters to understand their star formation efficiency, finding it remains constant over redshifts 2 to 7.3 and impacts cosmic reionization.

## Contribution

It introduces a semi-analytical model combining supernova feedback and halo mass functions to accurately reproduce LAE luminosity functions across high redshifts.

## Key findings

- Star formation efficiency in LAEs is redshift-independent.
- The fraction of Lyman-alpha emitters increases with redshift, reaching unity after reionization.
- The model successfully matches observed luminosity functions from z=2 to 7.3.

## Abstract

We present semi-analytical models of high redshift Lyman-{\alpha} emitters (LAEs) in order to constrain the star formation efficiency in those galaxies. Our supernova feedback induced star formation model along with Sheth-Tormman halo mass function correctly reproduces the shape, amplitude and the redshift evolution of UV and Lyman-{\alpha} luminosity functions of LAEs in the redshift range z = 2 to 7.3. We show that the fraction of Lyman-{\alpha} emitting galaxies increases with increasing redshifts reaching to unity just after the reionisation. However, we show that star formation efficiency in those LAEs does not show any redshift evolution within the uncertainty in available observations. This would have significant repercussion on the reionisation of the intergalactic medium.