Dark-Matter Halos of Early-Type Galaxies

Details Dark-Matter Halos of Early-Type Galaxies Dark-Matter Halos of Early-Type Galaxies

2005-10-28

arxiv.org/abs/astro-ph/0510819v1

Astronomy and Astrophysics

Astrophysics

2 pages, 2 figures, to appear in proceedings of "The X-Ray Universe 2005", San Lorenzo del Escorial, Spain, Sep 26-30 2005

Scientific paper

Cosmological simulations of galaxy formation predict a universal form for the mass profile of dark matter (DM) halos from cluster to galaxy scales. Remarkably few interesting constraints exist, however, on DM halos in early-type galaxies. Using Chandra we present the temperature, density and mass profiles of a small sample of early-type galaxies, revealing significant DM in each case. When a component is included to account for stellar mass and the DM halo is allowed to respond adiabatically to the baryonic condensation into stars, the mass profiles are well-fitted by the universal profile, with Virial masses and concentrations in agreement with simulations. However, only ~half, or less, of the mass within R_e seems attributable to the stars, implying stellar M_*/L_B ~1-5.

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