Abstract
Accurate monitoring of five Seyfert galaxies demonstrates that they are all variable in the IR region. These fluctuations probably arise when variations in the nonthermal UV sources change the rate of heating of interstellar dust within the nuclei of these galaxies, as demonstrated quantitatively for III Zw 2.
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Lebofsky, M., Rieke, G. Variations in the thermal emission of Seyfert galaxies. Nature 284, 410–412 (1980). https://doi.org/10.1038/284410a0
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DOI: https://doi.org/10.1038/284410a0
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