Publication

Dark Matter Contraction and the Stellar Content of Massive Early-type Galaxies: Disfavoring "Light" Initial Mass Functions

Auger, M. W., Treu, T., Gavazzi, R., Bolton, A. S., Koopmans, L. V. E. & Marshall, P. J., 1-Oct-2010, In : Astrophysical Journal Letters. 721, 2, p. L163-L167 5 p.

Research output: Contribution to journalArticleAcademicpeer-review

Copy link to clipboard

Documents

DOI

We use stellar dynamics, strong lensing, stellar population synthesis models, and weak lensing shear measurements to constrain the dark matter (DM) profile and stellar mass in a sample of 53 massive early-type galaxies. We explore three DM halo models (unperturbed Navarro, Frenk, and White (NFW) halos and the adiabatic contraction models of Blumenthal and Gnedin) and impose a model for the relationship between the stellar and virial mass (i.e., a relationship for the star formation efficiency as a function of halo mass). We show that, given our model assumptions, the data clearly prefer a Salpeter-like initial mass function (IMF) over a lighter IMF (e.g., Chabrier or Kroupa), irrespective of the choice of DM halo. In addition, we find that the data prefer at most a moderate amount of adiabatic contraction (Blumenthal adiabatic contraction is strongly disfavored) and are only consistent with no adiabatic contraction (i.e., an NFW halo) if a mass-dependent IMF is assumed, in the sense of a more massive normalization of the IMF for more massive halos.

Original languageEnglish
Pages (from-to)L163-L167
Number of pages5
JournalAstrophysical Journal Letters
Volume721
Issue number2
Publication statusPublished - 1-Oct-2010

    Keywords

  • dark matter, galaxies: elliptical and lenticular, cD, galaxies: halos, galaxies: structure, LENS ACS SURVEY, FUNDAMENTAL PLANE, SPHERICAL GALAXIES, INTERNAL STRUCTURE, DENSITY PROFILES, EVOLUTION, MODEL, HALOES, ENVIRONMENT, FRACTIONS

Download statistics

No data available

ID: 5168673