Black Hole Mass Determinations From Orbit Superposition Models are Reliable
(2004)
Central DM density cuspiness in LSB's: a stellar kinematics approach
IAU SYMP (2004) 337-338
Abstract:
We present preliminary results from spectroscopic observations of a sample of 11 low surface brightness galaxies (LSB). We measured the stellar and gaseous kinematics along their major and minor axes. Such information will allow us to accurately investigate the dark matter (DM) content within their optical regions, providing further constraints on the predictions of standard CDM models. Although dynamical modeling is still in progress, our observations already show that the derived stellar kinematics is more regular than the ionized gas one, which often shows evidence for non-circular and asymmetric motions.Generating Equilibrium Dark Matter Halos: Inadequacies of the Local Maxwellian Approximation
Astrophysical Journal 601 (2004) 37-46
Active galactic nuclei and the minor merger hypothesis
Monthly Notices of the Royal Astronomical Society 346:4 (2003) 1078-1088
Abstract:
We have investigated the dynamics of the merging process in the minor merger hypothesis for active galactic nuclei. We find that for a satellite galaxy to be able to merge directly with the nucleus of the host galaxy (for example, to give rise to the compact dust discs which are seen in early-type active galaxies), the initial orbit of the satellite is required to be well aimed. For the case of the host galaxy being a disc galaxy, if the initial orbits of the satellites are randomly oriented with respect to the host galaxy, then the orbits of those which reach the host nuclear regions in a reasonable time are also fairly randomly oriented once they reach the nucleus. We note that this result might be able to provide an explanation of why the jet directions in the nuclei of Seyfert galaxies are apparently unrelated to the plane of the galaxy discs.Central DM density cuspiness in LSB's: a stellar kinematics approach
(2003)