Talk Title: ISM dynamics around Black Holes in Nearby Radio Galaxies.
Abstract: We performed a dynamical analysis of the nuclear gas velocity dispersion around black holes in both active and quiescent ellipticals. Differences are found in the turbulent behavior of nuclear gas in ellipticals with and without radio jets. These results impact the black hole mass determinations by means of gas dynamical modeling which commonly assume circular rotation of the gas disks all the way to the nucleus. We also performed a maximum likelihood analysis which constrains the three dimensional structure and relative orientation of stellar host, central dusty fuel reservoir and jet in a sample of radio galaxies. This analysis is general in the sense that both circular and elliptic thick dust disks are explored together with various distribution functions of jet misalignment angles. A strong bimodal radio jet orientation is found as a function of dust orientation and morphology. This has implications for the triggering and duty cycle of black hole activity in nearby ellipticals. The modeling is based on results from HST imaging and spectroscopy.
Authors: Gijs Verdoes Kleijn (ESO), Roeland van der Marel, Stefi Baum Chris O'Dea (STScI), Tim de Zeeuw (Leiden), Jacob Noel-Storr (Columbia)
Link to talk: N/A