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.
Little red dots may reside in small, dense galaxies with total masses equivalent to around 1 billion times that of the sun, according to research published in Nature Astronomy.
Astronomy
Aug 25, 2026
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Astronomers have discovered the first confirmed dual active galactic nucleus in a Green Pea galaxy, revealing two supermassive black holes growing at the same time inside a compact, intensely star-forming system. X-ray observations ...
Since their discovery by NASA's James Webb Space Telescope in 2022, little red dots (LRDs) have been the subject of great interest to astronomers. Understanding the nature of these extremely distant, compact red sources has ...
Astronomy
Jul 29, 2026
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136
A new theoretical study may have cracked one of the most puzzling discoveries of the James Webb Space Telescope (JWST): Little Red Dots, spotted across the early universe. The paper, posted to the arXiv preprint server on ...
An international team of astronomers has performed photometric and spectroscopic observations of a compact stellar system around a nearby spiral galaxy known as NGC 7531. Results of the observational campaign, published September ...
NASA's Hubble Space Telescope and NASA's Chandra X-ray Observatory have teamed up to identify a new possible example of a rare class of black holes. Called NGC 6099 HLX-1, this bright X-ray source seems to reside in a compact ...
Astronomy
Jul 24, 2025
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59
By analyzing the available observational data, astronomers from the Tribhuvan University in Nepal and elsewhere have investigated the properties of a compact dwarf galaxy designated SDSS J134313.15+364457.5 (or J1343+3644 ...
An international team of astronomers reports the discovery of a new compact galaxy group using the Atacama Large Millimeter/submillimeter Array (ALMA). The new group, designated CGG-z4, hosts two optically dark star-forming ...
