Structural properties of isolated galaxies

Distinct components of galaxies are products of internal and environmental processes throughout their lifetimes. Disentangling these processes is an important issue for understanding how galaxies form and evolve. In this context isolated galaxies represent a fruitful population to explore as they should be mainly affected by internal processes (minimal merger/accretion/tidal effects). I will present the structural analysis of a representative sample from the AMIGA (Analysis of the interstellar Medium of Isolated GAlaxies; project. Analysis of the stellar mass-size relation for our isolated spiral galaxies reveals a larger size for disks in low-density environments as well as a dependence of disk size on the number of satellites. Preliminary results on the study of outer profiles of disks in isolated galaxies will be presented. A 2D bulge/disk/bar decomposition of SDSS i-band images was performed in order to identify the pseudobulges in our sample. We derived (g-i) bulge colors and find a large fraction of pseudobulges in the red sequence of early-type galaxies. The bluer pseudobulges in our sample tend to be located in those galaxies more affected by tidal interactions. The properties of the majority of bulges in isolated galaxies suggest that pseudobulges formed most of their mass at an early epoch, and that specific environmental events may rejuvenate pseudobulges.

11/12/2014 - 13:30
Mirian Fernández Lorenzo