Constraints on the stellar IMF of early-type galaxies from optical and NIR spectral features

Dr. Francesco La Barbera

Abstract

Understanding the stellar initial mass function (IMF) is a key aspect to obtain a complete picture of galaxy formation and evolution. In the past years, we have carried out a systematic census of the IMF in the unresolved stellar populations of (massive) early-type galaxies (ETGs), using optical and NIR spectroscopy from different surveys (e.g.  SDSS, CALIFA) and dedicated observing programmes (OSIRIS@GTC, XSHOOTER@VLT).  I will present results on a non-universal IMF in ETGs - pointing to an excess of low-mass stars in high-, relative to low-, mass galaxies - and current constraints on the physical driver behind the IMF variations.

About the talk

Constraints on the stellar IMF of early-type galaxies from optical and NIR spectral features
Dr. Francesco La Barbera
INAF
Thursday December 3, 2015
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