The role of mass in the evolution of galaxies: the downsizing effect

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

The multifrequency analysis of a large and complete sample of nearby, normal late-type galaxies shows that all their physical, structural and kinematical properties are strongly related to the total dynamical mass as traced by the H band luminosity. Mass, more than angular momentum, is thus the most important parameter governing galaxy evolution. By combining our multifrequency observational dataset with multizone chemo-spectrophotometric models of galaxy evolution we show that most of the properties of nearby galaxies can be well reproduced by assuming that they evolved smoothly without need for interactions or mergers. Massive galaxies formed most of their stars late in the past, while low luminosity objects are still forming stars at a rate comparable to that they had in the past. The properties of nearby galaxies are thus consistent with a secular evolution.

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