Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20517807p&link_type=abstract
American Astronomical Society Meeting 205, #178.07; Bulletin of the American Astronomical Society, Vol. 37, p.382
Astronomy and Astrophysics
Astronomy
Scientific paper
We present sub-arcsecond resolution mid-IR images of the Circinus galaxy at 8.74 and 18.33 μ m. We resolve extended emission at both wavelengths, extending ˜2″ from each side of the nucleus in an approximate east-west direction. These extensions are spatially coincident with previously detected compact ( ˜30pc) v-shaped [OIII] emission extending NW of the nucleus as well as contercone [SiVI] emission, emission at these wavelengths interpreted as delineating the interface between inflowing material and the ionization cone. We detect no extended MIR emission associated with the structure responsible for collimating the ionizing photons (i.e. obscuring torus or disk of material), limiting the flux density of the obscuring structure to ≤0.27mJy or a diameter of ≤0.20″ (≤4pc). These results highlight thecapabilities of high-spatial resolution observations of AGN from the new 8m class telescopes.
CP and JTR acknowledge the NSF Grant No. 0206617. ESP acknowledges the NASA grant NAG5-9997 (LTSA).
Aitken David K.
Alonso-Herrero Almudena
Colina Luis
Packham Christopher
Perlman Eric
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