The Extended Mid-Infrared Structure of the Circinus Galaxy | Zendy

C. Packham | Zendy; James T. Radomski | Zendy; P. F. Roche | Zendy; D. K. Aitken | Zendy; Eric S. Perlman | Zendy; A. AlonsoHerrero | Zendy; L. Colina | Zendy; C. M. Telesco | Zendy

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The Extended Mid-Infrared Structure of the Circinus Galaxy

Author(s) -

C. Packham,

James T. Radomski,

P. F. Roche,

D. K. Aitken,

Eric S. Perlman,

A. AlonsoHerrero,

L. Colina,

C. M. Telesco

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/427691

Subject(s) - physics , astrophysics , torus , galaxy , wavelength , infrared , flux (metallurgy) , active galactic nucleus , luminous infrared galaxy , emission spectrum , astronomy , spectral line , optics , geometry , mathematics , materials science , metallurgy

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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