939 citations · 2.2k across the 9 of their papers we have counts for
6 papers · 1 filter
Probing dark matter with X-ray binaries
Walter Dehnen, Andrew King
Low-mass X-ray binaries (LMXBs), which occur in old stellar populations, have velocities exceeding those of their parent distribution by at least 20 km/s. This makes them ideal pro…
Weighing the young stellar discs around Sgr A*
Sergei Nayakshin, Walter Dehnen, Jorge Cuadra +1
It is believed that young massive stars orbiting Sgr A* in two stellar discs on scales of 0.1-0.2 parsecs were formed either farther out in the Galaxy and then quickly migrated inw…
Halo evolution in the presence of a disc bar
Paul J. McMillan, Walter Dehnen
Angular momentum transfer from a rotating stellar bar has been proposed by Weinberg & Katz (2002) as a mechanism to destroy dark-matter cusps in a few rotation periods. The N-body…
Can bars be destroyed by a central mass concentration? I. Simulations
E. Athanassoula, J. C. Lambert, W. Dehnen
We study the effect of a central mass concentration (CMC) on the secular evolution of a barred disc galaxy. Unlike previous studies, we use fully self-consistent 3D -body simula…
Dynamical insight into dark-matter haloes
Walter Dehnen, Dean McLaughlin
We investigate, using the spherical Jeans equation, self-gravitating dynamical equilibria satisfying a relation rho/sigma_r^3 propto r^-alpha, which holds for simulated dark-matter…
Phase-space mixing and the merging of cusps
Walter Dehnen
Collisionless stellar systems are driven towards equilibrium by mixing of phase-space elements. I show that the excess-mass function D(f)= int_{F(x,v)>f} (F(x,v)-f) d^3x d^3v (with…