High Resolution Imaging of the Cold Circumnuclear ISM and the Discovery of a OH kilo-Maser in NGC 1068

Details High Resolution Imaging of the Cold Circumnuclear ISM and the Discovery of a OH kilo-Maser in NGC 1068 High Resolution Imaging of the Cold Circumnuclear ISM and the Discovery of a OH kilo-Maser in NGC 1068

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.2002g&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #20.02; Bulletin of the American Astronomical Society, Vol. 26, p.1342

Astronomy and Astrophysics

Astronomy

Scientific paper

We present ~ 1---2'' resolution VLA images of HI and OH absorption viewed against the bright radio continuum structure in the Seyfert galaxy NGC 1068. All of the detected absorption is confined to a region southwest of the radio nucleus and arises from the inner galaxian disk. We confirm the presence of an offset shock front and post-shock compression of material inside the leading edge of the stellar bar. That this shock is offset implies that the inner Lindblad resonance lies interior to the 3 kpc starburst ``ring'' and that the ring may have formed at the corotation resonance. We also report the discovery of a main line OH ``kilo-''maser roughly coincident with the faded H_2O ``mega-''maser. In contrast to the red-shifted H_2O maser, the principle OH emission feature is blue-shifted with respect to vsys by 300 km s(-1) . Weaker OH emission is also found centered near vsys. We consider the possibility that this OH maser might arise in a dense circumnuclear torus posited to hide the Seyfert 1 nucleus.

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