Star Forming Galaxies at z > 5

TL;DR

This paper reviews recent observational progress in detecting high-redshift star-forming galaxies from z=5 to z=10, highlighting the methods, findings, and challenges in studying the early universe and the first stars.

Contribution

It summarizes recent survey results and discusses the difficulties in identifying Population III star-dominated galaxies at very high redshifts.

Findings

Hundreds of galaxies detected at z=5-7 using optical surveys.

Candidate galaxies identified at z=7-10 through infrared imaging.

Challenges remain in unambiguously detecting Population III star galaxies.

Abstract

We present recent progress in searching for galaxies at redshift from z = 5 to z = 10. Wide-field and senstive surveys with 8m class telescopes have been providing more than several hundreds of star forming galaxies at z =5 - 7 that are probed in the optical window. These galaxies are used to study the early cosmic star formation activity as well as the early structure formation in the universe. Moreover, near infrared deep imaging and spectropscopic surveys have found probable candidates of galaxies from z = 7 to z = 10. Although these candidates are too faint to be identified unambiguously, we human being are now going to the universe beyond 13 billion light years, close to the epoch of first-generations stars; i.e., Population III stars. We also mention about challanges to find Population III-dominated galaxies in the early universe.