Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003newar..47..219w&link_type=abstract
New Astronomy Reviews, Volume 47, Issue 4-5, p. 219-223.
Astronomy and Astrophysics
Astronomy
7
Scientific paper
We are performing a survey of powerful 3CR radio galaxies and quasars in the mid-infrared. The purpose is to test for the presence of a powerful hidden quasar-like thermal nucleus by measuring the `waste heat' that must be emitted by any obscuring dust. The dust is treated as a calorimeter for the central engine. Three early mid-IR detections are particularly interesting: Cygnus A, M87, and Centaurus A. These are notable both as a demonstration of our technique and as an example of the great variety of objects that are classified as radio galaxies. We confirm the presence of hidden quasar-like nuclei in Cyg A and Cen A, but M87 shows only weak mid-IR emission, indicating its AGN is non-thermal, and consistent with only synchrotron emission. We also present a new near-infrared adaptive optics image of Cygnus A which shows a secondary point source.
Antonucci Robert
Whysong David
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