Galaxy Pairs in Cosmic Voids
Maria Laura Ceccarelli, Sol Alonso, Diego Garcia Lambas

TL;DR
This study analyzes galaxy pairs in cosmic voids, revealing they tend to be younger, bluer, and more actively forming stars than similar galaxies in denser environments, highlighting the impact of environment on galaxy evolution.
Contribution
It provides the first detailed statistical comparison of galaxy pair properties in voids versus other environments, emphasizing environment-driven differences in star formation and stellar populations.
Findings
Void pair galaxies are bluer and have younger stellar populations.
Void pairs exhibit higher star formation rates and efficiencies.
Void environments promote more active star formation in galaxy pairs.
Abstract
We present a statistical analysis of different astrophysical properties of a sample of galaxy pairs in cosmic voids. The sample consists of 72 galaxy pairs with projected separations and relative radial velocities rp<100 hkpc, 500 kms in the redshift range z<0.1. The different results for this pair sample are compared to those derived for matched samples configured in absolute magnitude, stellar mass and concentration residing in void wall and global averaged environments. We find that pair galaxies in voids tend to have bluer optical colors than the corresponding galaxies in wall an field, regardless of their stellar mass and concentration, which indicates a more recent formation of the bulk of stars. We also obtain larger mid--IR colors for the void paired galaxies with respect to the corresponding matched samples in the wall and in field environments.…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Stellar, planetary, and galactic studies · History and Developments in Astronomy
