Tracing the evolution of nearby early-type galaxies in low density environments. The Ultraviolet view from GALEX

Details Tracing the evolution of nearby early-type galaxies in low density environments. The Ultraviolet view from GALEX Tracing the evolution of nearby early-type galaxies in low density environments. The Ultraviolet view from GALEX

2011-01-05

arxiv.org/abs/1101.0898v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Conference "UV Universe 2010" S. Petersburg 31 May - 3 June, 2010 Accepted for publication in Astrophysics & Space Science . T

Scientific paper

10.1007/s10509-010-0586-5

We detected recent star formation in nearby early-type galaxies located in low density environments, with GALEX Ultraviolet (UV) imaging. Signatures of star formation may be present in the nucleus and in outer rings/arm like structures. Our study suggests that such star formation may be induced by different triggering mechanisms, such as the inner secular evolution driven by bars, and minor accretion phenomena. We investigate the nature of the (FUV-NUV) color vs. Mg2 correlation, and suggest that it relates to "downsizing" in galaxy formation.

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