Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mas..conf..235m&link_type=abstract
MULTIWAVELENGTH AGN SURVEYS. Proceedings of the Guillermo Haro Conference 2003. Held 8-12 December 2003 in Cozumel, Mexico. Edit
Astronomy and Astrophysics
Astronomy
Scientific paper
A fraction of active galactic nuclei do not show the classical Seyfert-type signatures in their optical spectra, i.e. they are optically "elusive". We have undertaken a program of multiwavelength observations (X-ray, infrared, radio) of nearby galaxies with the goal of searching for such elusive AGNs, estimate their occurrence and investigate their nature. Here we report preliminary results obtained by this program. The main findings can be summarized as follows: 1) elusive AGN have a local density comparable to or even higher than optically classified Seyfert nuclei; 2) most elusive AGN are heavily absorbed in the X-rays, with gas column densities exceeding 1024cm-2, suggesting that their peculiar nature is associated with obscuration; 3) it is likely that in elusive AGN, the nuclear UV source is completely embedded and the ionizing photons cannot escape, which prevents the formation of a classical Narrow Line Region.
Maiolino Roberto
Zappacosta Luca
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