Metallicities of Five z > 5 Emission-Line Galaxies in SMACS 0723 Revealed by JWST

Understand

JWST's Early Release Observations of the lensing cluster SMACS J0723.3-7327 have given an unprecedented spectroscopic look into the high-redshift universe.

• These observations reveal five galaxies at z > 5.
• All five have detectable [OIII]4363 line emission, indicating that these galaxies have high temperatures and low metallicities and that they are highly star forming.
• In recent work, the metallicities of these five galaxies have been studied using various techniques.