Dark Matter Contraction and the Stellar Content of Massive Early-type Galaxies: Disfavoring "Light" Initial Mass Functions - Archive ouverte HAL
Article Dans Une Revue The Astrophysical journal letters Année : 2010

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

M. W. Auger
  • Fonction : Auteur
T. Treu
  • Fonction : Auteur
A. S. Bolton
  • Fonction : Auteur
L. V. E. Koopmans
  • Fonction : Auteur
P. J. Marshall
  • Fonction : Auteur

Résumé

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.

Dates et versions

hal-03646055 , version 1 (19-04-2022)

Identifiants

Citer

M. W. Auger, T. Treu, R. Gavazzi, A. S. Bolton, L. V. E. Koopmans, et al.. Dark Matter Contraction and the Stellar Content of Massive Early-type Galaxies: Disfavoring "Light" Initial Mass Functions. The Astrophysical journal letters, 2010, 721, pp.L163-L167. ⟨10.1088/2041-8205/721/2/L163⟩. ⟨hal-03646055⟩
21 Consultations
0 Téléchargements

Altmetric

Partager

More