Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7273w&link_type=abstract
HST Proposal ID #7273
Other
Hst Proposal Id #7273 Agn/Quasars
Scientific paper
In the current AGN paradigm, distributions of ionized gas in so-called `ionization cones' are believed to be produced by shadowing of the central source of ionizing radiation by a molecular torus. If this is indeed the case, there should be an excellent correspondence between the locations of the inner edge of the torus and the edge of the inner apex of the cone. HST now offers the capability to test this prediction directly in the nearest Seyfert galaxy with both a large angular size `ionization cone' and a circumnuclear molecular disk. We propose to image the Circinus galaxy {a Seyfert 2 galaxy at 4 Mpc distance} in [OIII] 5007 and HAlpha+[NII] 6548, 6583 on the PC {to map out the ionized gas} and in a molecular hydrogen line at 2.12 Mum {to map out the warm H_2}. We expect to resolve both the apex of the cone and the `hole' in the middle of the torus, thus allowing a test of the above scenario. Other benefits include maps of the excitation of the ionized gas {which allows a check on the shadowing scenario} and of the green - red - near infrared continuum colors at unprecedented {sub-pc or pc} spatial resolution.
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