NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-24 T10:02:35 PDT
Help | Comment | NED Home

For refcode 2013MNRAS.435.2274W:
Retrieve 15 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by Royal Astronomical Society. 2013MNRAS.435.2274W The (galaxy-wide) IMF in giant elliptical galaxies: from top to bottom Weidner, Carsten; Ferreras, Ignacio; Vazdekis, Alexandre; La Barbera, Francesco Abstract. Recent evidence based independently on spectral line strengths and dynamical modelling point towards a non-universal stellar initial mass function (IMF), probably implying an excess of low-mass stars in elliptical galaxies with a high velocity dispersion. Here, we show that a time-independent bottom-heavy IMF is compatible neither with the observed metal-rich populations found in giant ellipticals nor with the number of stellar remnants observed within these systems. We suggest a two-stage formation scenario involving a time-dependent IMF to reconcile these observational constraints. In this model, an early strong starbursting stage with a top-heavy IMF is followed by a more prolonged stage with a bottom-heavy IMF. Such model is physically motivated by the fact that a sustained high star formation will bring the interstellar medium to a state of pressure, temperature and turbulence that can drastically alter the fragmentation of the gaseous component into small clumps, promoting the formation of low-mass stars. This toy model is in good agreement with the different observational constrains on massive elliptical galaxies, such as age, metallicity, {alpha}-enhancement, mass-to-light ratio or the mass fraction of the stellar component in low-mass stars. Key words: stars: luminosity function, mass function, galaxies: evolution, galaxies: star formation, galaxies: stellar content
Retrieve 15 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home