Star-forming compact groups: Tracing the early evolutionary stages of compact group environments
Ortiz-G\'omez S., Torres-Flores S., Monachesi A., Montaguth G. P., V\'eliz Astudillo S., Mendes de Oliveira C., Olave-Rojas D. E., Lima-Dias C., Demarco R., Pallero D., Lopes A. R., Cortesi A., Telles E., Kanaan A., Ribeiro T., Schoenell W

TL;DR
This study investigates how the environment of Star-Forming Compact Groups influences galaxy properties, revealing higher star formation rates and merger features compared to field galaxies, suggesting an early evolutionary stage of compact groups.
Contribution
It provides a detailed analysis of physical and morphological properties of SFCGs, highlighting their distinct star formation activity and merger features, and proposing their role as an early phase in compact group evolution.
Findings
SFCG galaxies have higher specific star formation rates than field galaxies.
Approximately 16% of SFCG galaxies show merger features and increased asymmetry.
SFCGs exhibit lower velocity dispersions and moderate crossing times, indicating an early evolutionary stage.
Abstract
In the context of pre-processing -- a scenario in which galaxies quench their star formation within substructures before falling into clusters -- we investigate the impact of environment on the physical and morphological properties of galaxies in Compact Groups (CGs), focusing specifically on a sample of Star-Forming Compact Groups (SFCGs). Our aim is to characterize the physical and morphological properties of galaxies in SFCGs, analogues of the Blue Infalling Group, and to understand how the environment influences their evolution. We use photometric techniques to derive stellar masses and star formation rates (SFRs). Morphological parameters are extracted from DECaLS images, obtaining parametric properties such as the S\'ersic index () and effective radius () using GALFITM, as well as non-parametric indices -- including the Gini coefficient, , and asymmetry…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Stellar, planetary, and galactic studies
