INVESTIGADORES
O'MILL Ana Laura
artículos
Título:
Structure and large-scale environment of galaxy pairs in the S-PLUS DR4
Autor/es:
CERDOSINO, M C; O?MILL, A L; RODRIGUEZ, F; TAVERNA, A; JR, L SODRÉ; TELLES, E; MÉNDEZ-HERNÁNDEZ, H; SCHOENELL, W; RIBEIRO, T; KANAAN, A; DE OLIVEIRA, C MENDEZ
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Año: 2024 vol. 528 p. 4993 - 5007
ISSN:
0035-8711
Resumen:
In this paper, we use photometric data from the Southern Photometric Local Universe Survey Data Release 4 survey to identifyisolated galaxy pairs and analyse their characteristics and properties. Our results align with previous spectroscopic studies,particularly in luminosity function parameters, suggesting a consistent trait among galaxy systems. Our findings reveal a highfraction of red galaxies across all samples, irrespective of projected distance, velocity difference, or luminosity ratio. We foundthat the proximity of a neighbour to its central galaxy influences its colour due to environmental effects. We also found thatcentral and neighbour have different behaviours: central galaxies maintain a stable red colour regardless of luminosity, whileneighbour colours vary based on luminosity ratios. When the central is significantly brighter, the neighbour tends to be less red.According to our division in red, blue, and mixed pairs, we found evidence of galactic conformity. The red pair fractions increasein closer pairs and in pairs of similar luminosity, indicating shared environments promoting red galaxy formation. Analysinglocal density, the expected colourdensity relation is of course recovered, but it is strongly determined by the stellar mass ofthe pair. In denser environments, the red pair fractions increase, blue pairs decrease, and for the mixed pairs it depends on theirstellar mass: more massive mixed pairs decrease their fraction, whereas the less massive ones increase it. These results shedlight on the intricate relationship between galaxy pairs, their characteristics, and environmental influences on colour, providinginsights into their evolutionary histories.
