114 citations · 742 across the 36 of their papers we have counts for
12 papers · 1 filter
Power-laws and Non-Power-laws in Dark Matter Halos
R. N. Henriksen
Simulated dark matter profiles are often modelled as a `NFW' density profile rather than a single power law. Recently, attention has turned to the rather rigorous power-law behavio…
On Universal Halos and the Radial Orbit Instability
Joseph D. MacMillan, Lawrence M. Widrow, Richard N. Henriksen
The radial orbit instability drives dark matter halos toward a universal structure. This conclusion, first noted by Huss, Jain, and Steinmetz, is explored in detail through a serie…
Non-radial motion and the NFW profile
Morgan Le Delliou, Richard N Henriksen
The self-similar infall model (SSIM) is normally discussed in the context of radial orbits in spherical symmetry. However it is possible to retain the spherical symmetry while perm…
Relaxation of a Collisionless System and the Transition to a New Equilibrium Velocity Distribution
Thomas E. C. Merrall, Richard N. Henriksen
In this paper, we present our conclusions from the numerical study of the collapse of a destabilized collisionless stellar system. We use both direct integration of the Vlasov-Pois…
Dynamical Black Hole Growth and the M_{BH}-σRelation
Joseph D. MacMillan, Richard N. Henriksen
This poster discusses a possible explanation for the relationship between the mass of the central supermassive black hole and the velocity dispersion in the bulge of the host galax…
Protostellar Evolution during Time Dependent, Anisotropic Collapse
Mahmoud Aburihan, Jason D. Fiege, Richard N. Henriksen +1
The formation and collapse of a protostar involves the simultaneous infall and outflow of material in the presence of magnetic fields, self-gravity, and rotation. We use self-simil…
Magnetized Protostellar Bipolar Outflows I. Self-similar model
Thibaut Lery, Richard N. Henriksen, Jason D. Fiege
We study a self-similar circulation model for protostellar bipolar outflows. The model is axisymmetric and stationary, and now includes Poynting flux. Compared to an earlier versio…
Relaxing and Virializing a Dark Matter Halo
Richard N. Henriksen, Lawrence M. Widrow
Navarro, Frenk, and White have suggested that the density profiles of simulated dark matter halos have a ``universal'' shape so that a given halo can be characterized by a single f…
Time-dependent accretion and ejection implied by pre-stellar density profiles
R. Henriksen, P. Andre, S. Bontemps
Recent observations suggest that mass ejection and mass accretion both decline significantly with time during early protostellar evolution (Bontemps et al. 1996). In the present pa…
Self-Similar Approach to Violent Relaxation
Richard Henriksen, Lawrence M. Widrow
We consider the evolution of an initially cold, spherically symmetric system of self-gravitating particles. At early times the system undergoes self-similar collapse of the type de…
Distribution of Gamma-Ray Bursts in Halo Neutron Star-Comet Models
M. G. Higgins, R. N. Henriksen
The motions of comets and neutron stars have been integrated over five billion years in the Galactic potential to determine a gamma-ray burst distribution, presuming that bursts ar…
Hydrogen Clouds and the MACHO/EROS Events
Richard N. Henriksen, Lawrence M. Widrow
We propose that the recently reported MACHO/EROS events correspond to gravitational amplification by dark clouds rather than compact objects. These clouds must be very dense with $…