High-Resolution Mid-Infrared Morphology of Cygnus A

Details High-Resolution Mid-Infrared Morphology of Cygnus A High-Resolution Mid-Infrared Morphology of Cygnus A

2001-10-15

arxiv.org/abs/astro-ph/0110347v1

Astronomy and Astrophysics

Astrophysics

20 pages, 8 figures, accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/338071

We present subarcsecond resolution mid-infrared images at 10.8 and 18.2 microns of Cygnus A. These images were obtained with the University of Florida mid-IR camera/spectrometer OSCIR at the Keck II 10-m telescope. Our data show extended mid-IR emission primarily to the east of the nucleus with a possible western extension detected after image deconvolution. This extended emission is closely aligned with the bi-conical structure observed at optical and near-IR wavelengths by the HST. This emission is consistent with dust heated from the central engine of Cygnus A. We also marginally detect large-scale low level emission extending > 1.5 kpc from the nucleus which may be caused by in-situ star formation, line emission, and/or PAH contamination within the bandpass of our wide N-band filter.

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