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Barred Galaxies: an Observer's Perspective Dimitri A. Gadotti

Summary: Barred Galaxies: an Observer's Perspective
Dimitri A. Gadotti
Max Planck Institute for Astrophysics
Karl-Schwarzschild-Str. 1, D-85741 Garching bei M¨unchen, Germany
Summary. I review both well established and more recent findings on the proper-
ties 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 com-
pared 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.
1 Some Basic Facts
It is well established now that bars are very often found in disc galaxies.
One usually finds a bar fraction of 2/3 [32], considering both prominent


Source: Alexei, Dimitri - European Southern Observatory


Collections: Physics