Environmental Dependence of the AGN Activity

Details Environmental Dependence of the AGN Activity Environmental Dependence of the AGN Activity

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.7508c&link_type=abstract

American Astronomical Society, AAS Meeting #211, #75.08; Bulletin of the American Astronomical Society, Vol. 39, p.866

Mathematics

Probability

Scientific paper

We studied the dependence of the activity of the narrow-line active galactic nucleus (AGN) on the environment using the SDSS sample. The environmental factors considered are the host properties (velocity dispersion, morphology), the morphology and activity of the nearest neighbor galaxy, the local density due to the nearest neighbor, and large-scale background density.
We found that the AGN activity requires both high fuel supply and a powerful engine. As a result, the probability for a galaxy to host an AGN is higher for red ones among spiral galaxies and for relatively blue ones among ellipticals and lenticulars. Correspondingly, the color distribution of the AGN hosts is not bimodal. We have also found that the probability depends sensitively on the nearest neighbor's morphology when the target galaxy is located within the virial radius of the neighbor.
The AGN triggering probability seems to increase when a galaxy has a spiral neighbor located within the virial radius because there is fuel supply from the neighbor. On the other hand, it seems to decrease when the neighbor is an elliptical or lenticular galaxy because the hydrodynamic and radiative effects of the early type neighbor reduce the cold gas contents of the target galaxy.

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