期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 721, 期 2, 页码 L163-L167出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/721/2/L163
关键词
dark matter; galaxies: elliptical and lenticular, cD; galaxies: halos; galaxies: structure
资金
- NSF [NSF-0642621]
- Packard Foundation
- NASA [11202, 10798, 10494]
- Centre National des Etudes Spatiales
- Science and Technology Facilities Council [ST/H00243X/1] Funding Source: researchfish
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据