Research news on Compact galaxies

Compact galaxies as a research area focuses on the identification, structural characterization, and evolution of galaxies with unusually small effective radii and high stellar mass surface densities relative to typical systems of comparable mass. This field investigates their internal kinematics, stellar populations, and gas content to constrain formation pathways such as dissipative collapse, gas-rich mergers, or rapid early quenching. Studies often exploit high-resolution imaging and spectroscopy to quantify size–mass relations, central density profiles, and dynamical states, and to link compact galaxies across cosmic time, particularly comparing high-redshift compact quiescent or star-forming systems with potential low-redshift relics to test models of galaxy assembly and size growth.