Journal Article

The kinematic connection between galaxies and dark matter haloes

Aaron A. Dutton, Charlie Conroy, Frank C. van den Bosch, Francisco Prada and Surhud More

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 407, issue 1, pages 2-16
Published in print September 2010 | ISSN: 0035-8711
Published online August 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16911.x
The kinematic connection between galaxies and dark matter haloes

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Using estimates of dark halo masses from satellite kinematics, weak gravitational lensing and halo abundance matching, combined with the Tully–Fisher (TF) and Faber–Jackson relations, we derive the mean relation between the optical, Vopt, and virial, V200, circular velocities of early- and late-type galaxies at redshift z≃ 0. For late-type galaxies, VoptV200 over the velocity range Vopt= 90–260 km s−1, and is consistent with Vopt=Vmax,h[the maximum circular velocity of NFW dark matter haloes in the concordance Λ cold dark matter (Λ CDM) cosmology]. However, for early-type galaxies VoptV200, with the exception of early-type galaxies with Vopt≃ 350 km s−1. This is inconsistent with early-type galaxies being, in general, globally isothermal. For low-mass (Vopt≲ 250 km s−1) early-types Vopt > Vmax,h, indicating that baryons have modified the potential well, while high-mass (Vopt > rsim 400 km s−1) early-types have Vopt < Vmax,h. Folding in measurements of the black hole mass–velocity dispersion relation, our results imply that the supermassive black hole–halo mass relation has a logarithmic slope which varies from ≃1.4 at halo masses of ≃ 1012 h−1 M to ≃0.65 at halo masses of 1013.5 h−1 M. The values of Vopt/V200 we infer for the Milky Way (MW) and M31 are lower than the values currently favoured by direct observations and dynamical models. This offset is due to the fact that the MW and M31 have higher Vopt and lower V200 compared to typical late-type galaxies of the same stellar masses. We show that current high-resolution cosmological hydrodynamical simulations are unable to form galaxies which simultaneously reproduce both the Vopt/V200 ratio and the VoptMstar (Tully–Fisher/Faber–Jackson) relation.

Keywords: galaxies: elliptical and lenticular, cD; galaxies: fundamental parameters; galaxies: haloes; galaxies: kinematics and dynamics; galaxies: spiral

Journal Article.  12652 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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