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Photometric Measurements at λ = 11 µm of NGC4151

Nature Physical Science volume 233, pages 16–18 (1971)Cite this article

Abstract

THE importance of determining the timescale of possible variations of infrared radiation from the nuclei of Seyfert galaxies has been discussed in detail independently by Rees et al.1 and by Burbidge and Stein2. Conclusive evidence for variations of flux with time at wavelengths λ ≥ 10 µm would place serious constraints on models devised for the radiation mechanism that is the source of this energy. In particular, it is unlikely that the hypothesis of a luminous source of short wavelength radiation surrounded by a cloud of solid particles which radiates at infrared wavelengths can be seriously considered if variations exist on timescales much less than a year. If variations were found on much shorter timescales such as a day, serious constraints would also be placed on non-thermal sources for the origin of the infrared energy.

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Authors and Affiliations

  1. University of California, San Diego

    WAYNE A. STEIN

  2. University of Minnesota,

    WAYNE A. STEIN

  3. University of California, San Diego

    F. C. GILLETT

Authors
  1. WAYNE A. STEIN
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  2. F. C. GILLETT
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STEIN, W., GILLETT, F. Photometric Measurements at λ = 11 µm of NGC4151. Nature Physical Science 233, 16–18 (1971). https://doi.org/10.1038/physci233016a0

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