The Extended Mid-Infrared Structure of the Circinus Galaxy

Details The Extended Mid-Infrared Structure of the Circinus Galaxy The Extended Mid-Infrared Structure of the Circinus Galaxy

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...618l..17p&link_type=abstract

The Astrophysical Journal, Volume 618, Issue 1, pp. L17-L20.

Astronomy and Astrophysics

Astronomy

35

Galaxies: Active, Galaxies: Individual: Name: Circinus, Galaxies: Nuclei, Galaxies: Seyfert, Infrared: Galaxies

Scientific paper

We present subarcsecond resolution mid-IR images of the Circinus galaxy at 8.74 and 18.33 μm. 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 (~30 pc) V-shaped [O III] emission extending northwest of the nucleus as well as countercone [Si VI] emission, emission at these wavelengths interpreted as delineating the interface between inflowing material and the ionization cone. We detect no extended mid-IR 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 <=0.27 mJy or a diameter of <=0.20" (<=4 pc).

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