Penetrating Dust Tori in AGN

Details Penetrating Dust Tori in AGN Penetrating Dust Tori in AGN

2004-06-29

arxiv.org/abs/astro-ph/0406669v1

Astronomy and Astrophysics

Astrophysics

To appear in proceeding from "Penetrating Bars through Masks of Cosmic Dust" conference in South Africa. 5 pages

Scientific paper

We present preliminary results from high resolution (~ 0.05") adaptive optics observations of Cygnus A. The images show a bi-conic structure strongly suggestive of an obscuring torus around a quasar nucleus. A bright (K'=18.5) point source is found near the expected position of the nucleus. We interpret this source as the hot inner rim of the torus seen through the opening of the torus. Using high angular resolution K-band spectroscopy, we measure the ratio of molecular to recombination hydrogen lines as a function of distance to the center of the putative torus. These measurements place constraints on the properties of the torus and indicate a projected diameter of ~600 pc.

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