Where are compact groups in the local Universe?
Eugenia Diaz-Gimenez, Ariel Zandivarez (IATE-CONICET, OAC-UNC,, Cordoba, Argentina)

TL;DR
This study investigates the spatial distribution of compact galaxy groups in the local universe, revealing most are isolated and providing insights into their physical density and environmental context using observational and simulated data.
Contribution
It introduces a new method to identify embedded compact groups in large-scale structures and compares observational data with semi-analytical models to understand their distribution.
Findings
Only 27% of compact groups are embedded in larger overdense systems.
Embedded groups tend to be smaller and have brighter surface brightness.
Approximately 70% of embedded groups are predicted to be physically dense in 3D.
Abstract
The purpose of this work is to perform a statistical analysis of the location of compact groups in the Universe from observational and semi-analytical points of view. We used the velocity-filtered compact group sample extracted from the Two Micron All Sky Survey for our analysis. We also used a new sample of galaxy groups identified in the 2M++ galaxy redshift catalogue as tracers of the large-scale structure. We defined a procedure to search in redshift space for compact groups that can be considered embedded in other overdense systems and applied this criterion to several possible combinations of different compact and galaxy group subsamples. We also performed similar analyses for simulated compact and galaxy groups identified in a 2M++ mock galaxy catalogue constructed from the Millennium Run Simulation I plus a semi-analytical model of galaxy formation. We observed that only…
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