Speaker: Tony García-Barreto, Visiting
Faculty, Caltech, and UNAM
Title: "Barred Galaxies, Circumnuclear Structures, NGC 3367:
Project 738, an Update"
Abstract:
Structures found around the compact nucleus of a galaxy are most likely
explained by galactic dynamics considering epicycle frequencies and a
non-axisymmetric gravitational potential. Observationally then one needs
to determine the velocity field, from small to large distances, and the
spatial location of the structure (imaging Halpha, radio continuum or
optical colors). I will show some examples of Halpha and radio continuum
images of clear CNS; underlying the observation of a compact radio
continuum emission from the compact nucleus in some galaxies and not in
others. This will take us to NGC 3367, an SBc galaxy. This galaxy shows
an unresolved Halpha source in the center, a compact radio continuum
source and two large lobes straddling the nucleus up to 6 kpc on the plane
of the sky indicating an outflow process in this galaxy. Halpha Fabry-Perot
observations have already given us the values of the geometric parameters:
position angle of the receding semi major axis and thus the orientation of
the semi-minor axis. Finally I will show preliminary maps of the C + L
configuration CO(1-0) observations from OVRO millimeter array.