High-Resolution Mid-Infrared Morphology of Cygnus A

Abstract

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.

arXiv comment20 pages, 8 figures, accepted for publication in the Astrophysical Journal

References in corpus (4)

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• Highly polarized structures in the near-nuclear regions of Cygnus A: intrinsic anisotropy within the cones?
• The 9.7 Micron Silicate Dust Absorption Toward the Cygnus A Nucleus and the Inferred Location of the Obscuring Dust

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