On the velocity fields in elliptical galaxies with dark matter

Dark Matter in Elliptical Galaxies?

Limits on Collisional Dark Matter from Elliptical Galaxies in Clusters

The dynamical evolution of galaxies in clusters is modified if dark matter is selfinteracting. Heat conduction from the hot cluster halo leads to evaporation of the relatively cooler galactic halos. The stellar distribution would adiabatically expand as it readjusts to the loss of dark matter, reducing the velocity dispersion and increasing the half-light radius. If the dark matter content with...

Modelling Kinematics and Dark Matter: The Halos of Elliptical Galaxies⋆

This review is focussed on the outer halos of elliptical galaxies. Its emphasis is on (i) planetary nebulae as test particles to trace the stellar kinematics at large radii, (ii) the observed angular momentum in elliptical galaxy halos and its theoretical relevance, (iii) dynamical modelling of stellar-kinematic data, and (iv) a discussion of the evidence for dark matter halos in ellipticals fr...

Prevalence and Properties of Dark Matter in Elliptical Galaxies

Given the recently deduced relationship between X-ray temperatures and stellar velocity dispersions (the “T–σ relation”) in an optically complete sample of elliptical galaxies (Davis & White 1996), we demonstrate that L > L∗ ellipticals contain substantial amounts of dark matter in general. We present constraints on the dark matter scale length and on the dark-to-luminous mass ratio within the ...

A dearth of dark matter in ordinary elliptical galaxies.

The kinematics of the outer parts of three intermediate-luminosity elliptical galaxies were studied with the Planetary Nebula Spectrograph. The galaxies' velocity-dispersion profiles were found to decline with the radius, and dynamical modeling of the data indicates the presence of little if any dark matter in these galaxies' halos. This unexpected result conflicts with findings in other galaxy...