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Title: CONNECTION BETWEEN DYNAMICALLY DERIVED INITIAL MASS FUNCTION NORMALIZATION AND STELLAR POPULATION PARAMETERS

We report on empirical trends between the dynamically determined stellar initial mass function (IMF) and stellar population properties for a complete, volume-limited sample of 260 early-type galaxies from the ATLAS{sup 3D} project. We study trends between our dynamically derived IMF normalization α{sub dyn} ≡ (M/L){sub stars}/(M/L){sub Salp} and absorption line strengths, and interpret these via single stellar population-equivalent ages, abundance ratios (measured as [α/Fe]), and total metallicity, [Z/H]. We find that old and alpha-enhanced galaxies tend to have on average heavier (Salpeter-like) mass normalization of the IMF, but stellar population does not appear to be a good predictor of the IMF, with a large range of α{sub dyn} at a given population parameter. As a result, we find weak α{sub dyn}-[α/Fe] and α{sub dyn} –Age correlations and no significant α{sub dyn} –[Z/H] correlation. The observed trends appear significantly weaker than those reported in studies that measure the IMF normalization via the low-mass star demographics inferred through stellar spectral analysis.
Authors:
 [1] ; ; ; ;  [2] ;  [3] ;  [4] ;  [5] ; ;  [6] ;  [7] ; ; ; ;  [8] ;  [9] ;  [10] ; ;  [11] ;  [12] more »; « less
  1. Department of Physics and Astronomy, Macquarie University, Sydney NSW 2109 (Australia)
  2. Sub-Department of Astrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH (United Kingdom)
  3. Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States)
  4. Department of Astronomy, Campbell Hall, University of California, Berkeley, CA 94720 (United States)
  5. Observatoire de Paris, LERMA and CNRS, 61 Av. de l'Observatoire, F-75014 Paris (France)
  6. Laboratoire AIM Paris-Saclay, CEA/IRFU/SAp- CNRS-Université Paris Diderot, F-91191 Gif-sur-Yvette Cedex (France)
  7. Ritter Astrophysical Observatory, University of Toledo, Toledo, OH 43606 (United States)
  8. European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching (Germany)
  9. Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh, EH9 3HJ (United Kingdom)
  10. Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam (Germany)
  11. Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, 7990 AA Dwingeloo (Netherlands)
  12. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85741 Garching (Germany)
Publication Date:
OSTI Identifier:
22365061
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 792; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; CORRELATIONS; GALAXIES; MASS; METALLICITY; STAR EVOLUTION; STARS