175 citations · 2.7k across the 72 of their papers we have counts for
6 papers · 1 filter
Dark matter inner slope and concentration in galaxies: from the Fornax dwarf to M87
G. A. Mamon, J. Chevalier, A. J. Romanowsky +1
We apply two new state-of-the-art methods that model the distribution of observed tracers in projected phase space to lift the mass / velocity anisotropy (VA) degeneracy and deduce…
Cosmological Parameters From Supernovae Associated With Gamma-ray Bursts
Xue Li, Jens Hjorth, Radosław Wojtak
We report estimates of the cosmological parameters and obtained using supernovae (SNe) associated with gamma-ray bursts (GRBs) at redshifts up to 0.606. Eight high-fide…
Radial orbit instability in dwarf dark matter haloes
Grzegorz Gajda, Ewa L. Lokas, Radoslaw Wojtak
Using N-body simulations we study the phenomenon of radial orbit instability occurring in dark matter haloes of the size of a dwarf galaxy. We carried out simulations of seven sphe…
Effect of asphericity in caustic mass estimates of galaxy clusters
Jacob Svensmark, Radoslaw Wojtak, Steen H. Hansen
The caustic technique for measuring mass profiles of galaxy clusters relies on the assumption of spherical symmetry. When applied to aspherical galaxy clusters, the method yields m…
Galaxy Cluster Mass Reconstruction Project: I. Methods and first results on galaxy-based techniques
L. Old, R. A. Skibba, F. R. Pearce +18
This paper is the first in a series in which we perform an extensive comparison of various galaxy-based cluster mass estimation techniques that utilise the positions, velocities an…
Statistical mechanics of collisionless orbits. IV. Distribution of angular momentum
Liliya L. R. Williams, Jens Hjorth, Radoslaw Wojtak
It has been shown in previous work that DARKexp, which is a theoretically derived, maximum entropy, one shape parameter model for isotropic collisionless systems, provides very goo…