Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21431106h&link_type=abstract
American Astronomical Society, AAS Meeting #214, #311.06; Bulletin of the American Astronomical Society, Vol. 41, p.747
Astronomy and Astrophysics
Astronomy
Scientific paper
The study of the fueling process in the centers of active galaxies is paramount for understanding the origin of nuclear activity and galaxy evolution. To trace the neutral gas flow from the outer galactic disk at several kpc distance to a few 10 pc in the very center, the NUGA key project on molecular gas (CO, using the IRAM PdBI) is complemented with high quality spectroscopic observations of the atomic gas (HI, using the VLA) for a sample of 16 nearby active spiral galaxies (low luminosity AGN and starburst galaxies).
To evaluate the efficiency and timescales of fueling mechanisms, two-dimensional maps of the gas flow were calculated on the basis of NIR images combined with CO and HI data. In this talk, I will present the final results of this study, showing that spiral disks are very dynamic systems that undergo strong secular evolution on timescales of a few rotation periods, due to the effectiveness of gravitational torques in redistributing cold galactic gas. Thus, gas can be transported from the outer disk all the way into the galaxy center at 100 pc, even overcoming previously assumed dynamical barriers to gas transport such as the corotation resonances of stellar bars.
Combes François
Emsellem Eric
Garcia-Burillo Santiago
Haan Sebastian
Mundell Carole G.
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