Fireballs in the Perseus Cluster: Euclid Spots Star Formation in Stripped Galaxy Tails
Astronomers used Euclid data to study two galaxies in the Perseus Cluster undergoing ram-pressure stripping, where hot cluster gas removes galaxy gas. Surprisingly, new stars form in the stripped tails, confirmed by UV, optical, and radio data. The study shows how galaxies evolve in extreme environments and highlights Euclid’s ability to detect faint, small-scale star formation beyond galaxy discs.
Altieri’s Lens: A Rare Einstein Ring Discovered by Euclid
O’Riordan et al. discovered a rare Einstein ring, “Altieri’s Lens,” around NGC 6505 using Euclid data. The lensing galaxy, at redshift z=0.042, bends light from a background galaxy, forming a near-perfect ring. Detailed analysis reveals a low dark matter fraction and a heavier-than-usual stellar population, providing new insights into galaxy structure and evolution.