Infrared angular size and the supermassive black hole hypothesis in AGN

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Scientific paper

Various methods of calculating the angular size of a dust cloud heated by a single central source are reviewed and compared with the observed λ~10 μm angular size. Seyfert nuclei of NGC1068 and NGC4151 are consistent with this interpretation. However, a number of other central regions of galaxies NGC253, M82,MK171 are observed to be much larger than that expected for a centrally heated cloud implying that the source of heating luminosity is distributed within the volume. Thus, these are examples of regions of enhanced star formation activity. Another object of considerable importance, MK231, has been suggested to be an imbedded QSO. Published limits do not resolve the core of this object. Further work on resolving nuclei of galaxies at infrared wavelengths will be of significance, especially with the new generation of 10m class telescopes.

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