Galaxy evolution in groups. USGC U268 and USGC U376 in the Leo cloud

Abstract

With the aim of investigating galaxy evolution in nearby galaxy groups, we analysed the spectral energy distribution of 24 galaxies, members of two groups in the Leo cloud, USGC U268 and USGC U376. We estimated the ages and stellar masses of the galaxies by fitting their total apparent magnitudes from far-ultraviolet to near-infrared with population synthesis models. The comparison of the results for a subsample of galaxies with smooth particle hydrodynamic (SPH) simulations with chemo-photometric implementation, shows that in most cases the estimated stellar masses obtained with the two different approaches are in good agreement. The kinematical and dynamical analysis indicates that USGC U268 is in a pre-virial collapse phase while USGC U376 is likely in a more evolved phase towards virialization.

16 pages, 6 figures; accepted for publication in Advances in Space Research, Special Issue: Ultraviolet Astrophysics

References in corpus (4)

• UV Star Formation Rates in the Local Universe
• The ($NUV-r$) vs. $M_r$ as a tracer of early-type galaxies evolution in USGC U376 and LGG 225 groups
• Kinematics, Substructure and Luminosity-weighted Dynamics of Six Nearby Galaxy Groups
• Tracing the evolution of nearby early-type galaxies in low density environments. The Ultraviolet view from GALEX

Cited by in corpus (3)

• The Ultraviolet Sky: An Overview from the GALEX Surveys
• The Galaxy Evolution Explorer (GALEX). Its legacy of UV surveys, and science highlights
• Galaxy evolution in nearby galaxy groups. III. A GALEX view of NGC 5846, the largest group in the local universe