Search
Now showing items 1-10 of 15
Post-Newtonian simulations of super-massive black hole binaries in galactic nuclei
(Wiley-VCH Verlag Berlin: Astronomische Nachrichten, 2008-12)
We present some preliminary results from recent numerical simulations that model the evolution of super-massive black
hole (SMBH) binaries in galactic nuclei. Including the post-Newtonian terms for the binary system and ...
An Instability in triaxial stellar systems
(Wiley InterScience: Astronomische Nachrichten, 2008-12)
The radial-orbit instability is a collective phenomenon that has heretofore only been observed in spherical systems. We
find that this instability occurs also in triaxial systems, as we checked by performing extensive ...
A Hybrid N-Body Code incorporating algorithmic regularization and Post-Newtonian forces
(Wiley InterScience: Monthly Notices of the Royal Astronomical Society, 2008-07-24)
We describe a novel N-body code designed for simulations of the central regions of
galaxies containing massive black holes. The code incorporates Mikkola’s “algorithmic”
chain regularization scheme including post-Newtonian ...
The Black hole mass of NGC 4151: comparison of reverberation mapping and stellar dynamical measurements
(American Astronomical Society - The Astrophysical Journal, 2007-11-20)
We present a stellar dynamical estimate of the black hole (BH) mass in the Seyfert 1
galaxy, NGC 4151. We analyze ground-based spectroscopy as well as imaging data
from the ground and space, and we construct 3-integral ...
Empirical models for Dark Matter Halos. I. Nonparametric Construction of Density Profiles and comparison with Parametric Models
(American Astronomical Society - The Astronomical Journal, 2006-12)
We use techniques from nonparametric function estimation theory to extract the density pro-
files, and their derivatives, from a set of N-body dark matter halos. We consider halos generated
from ΛCDM simulations of ...
Algorithmic regularization with velocity-dependent forces
(Blackwell Publishing: Monthly Notices of the Royal Astronomical Society, 2006-05)
Algorithmic regularization uses a transformation of the equations of motion such that
the leapfrog algorithm produces exact trajectories for two-body motion as well as regular
results in numerical integration of the ...
The nature of the HE0450-2958 system
(Blackwell Publishing, 2005-11-10)
Magain et al. (2005) argued that the host galaxy of the quasar in HE0450-2958 is substantially under-luminous given the likely mass of its nuclear black hole. Using kinematical information from the spectra of the quasar ...
Interaction of supermassive black holes with their stellar and dark matter environments
(Springer, 2005-06-22)
While supermassive black holes probably gained most of their mass via accretion
of gas, the galactic nuclei in which they are currently situated are dominated
by stars. This article reviews recent theoretical work on the ...
Dark matter dynamics and indirect detection
(Modern Physics Letters A, 2005-05-10)
Non-baryonic, or “dark”, matter is believed to be a major component of the total mass
budget of the universe. We review the candidates for particle dark matter and discuss
the prospects for direct detection (via interaction ...
Systolic and hyper-systolic algorithms for the gravitational N-body problem, with an application to Brownian motion
(Elsevier Science: Academic Press, 2003-03-01)
A systolic algorithm rhythmically computes and passes data through a network of processors. We investigate the performance of systolic algorithms for implementing the gravitational N-body problem on distributed-memory ...