Mid-Infrared Spectroscopic Observations of Cygnus A

Details Mid-Infrared Spectroscopic Observations of Cygnus A Mid-Infrared Spectroscopic Observations of Cygnus A

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342101m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #421.01; Bulletin of the American Astronomical Society, Vol. 41, p.238

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Scientific paper

According to the unified model of active galactic nuclei (AGN), the central engine is surrounded by optically thick clouds in a toroidal structure. Most of the energy from the central engine is absorbed by the torus, and re-emitted in the mid-infrared. Since the composition and geometry of the torus is still ill-defined, mid-IR data, especially spectroscopic data, provides valuable insight into this region. We will present mid-IR spectroscopic observations of the radio loud AGN Cygnus A using the Subaru 8.4m telescope. This is the first powerful radio galaxy to have high-resolution ground-based mid-IR spectroscopic and imaging observations, providing a new window into the inner working of a radio loud AGN. While the orbital environment gives Spitzer superior sensitivity, ground-based telescopes can achieve diffraction limited observations in the mid-IR, allowing spatial resolution approaching 0.3''. We will present an analysis of the spectroscopic features found in Cyg A, how the features compare to different models for the nucleus of a radio load AGN, and an analysis of how the features seen in the mid-IR fit with the the overall spectral energy distribution, comparing features seen in the mid-IR with features seen in the radio, optical, and x-ray bands. We will also compare and contrast our Cyg A data with mid-IR data from other types of AGN showing the similarities and differences between these objects as seen in the mid-IR. These observations will set the stage for future mid-IR observations of radio galaxies and complement and guide our ongoing survey of nearby radio galaxies in the mid-IR.

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