Barred Galaxies: an Observer's Perspective

TL;DR

This review synthesizes observational and theoretical insights into barred galaxy properties, emphasizing structural analysis from SDSS data, correlations with galaxy evolution, and highlighting future research directions.

Contribution

It provides a comprehensive structural analysis of ~300 barred galaxies from SDSS, linking observational properties with galaxy evolution and theoretical models.

Findings

Bars grow longer, thinner, and stronger with dynamical age.

Bar growth is connected to bulge development.

Correlations suggest evolutionary pathways for barred galaxies.

Abstract

I review both well established and more recent findings on the properties of bars, and their host galaxies, stemming from photometric and spectroscopic observations, and discuss how these findings can be understood in terms of a global picture of the formation and evolution of bars, keeping a connection with theoretical developments. In particular, I show the results of a detailed structural analysis of ~ 300 barred galaxies in the Sloan Digital Sky Survey, providing physical quantities, such as bar length, ellipticity and boxyness, and bar-to-total luminosity ratio, that can either be used as a solid basis on which realistic models can be built, or be compared against more fundamental theoretical results. I also show correlations that indicate that bars grow longer, thinner and stronger with dynamical age, and that the growth of bars and bulges is connected. Finally, I briefly discuss open questions and possible directions for future research.