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Extended Infrared Emission in Seyfert Galaxies

Published online by Cambridge University Press:  04 August 2017

J.M. Rodriguez Espinosa  and
R.J. Rudy
J.M. Rodriguez Espinosa
Affiliation:
European Southern Observatory Karl-Schwarzschild-Str. 2 D-8046 Garching bei München Federal Republic of Germany
R.J. Rudy
Affiliation:
Space Sciences Laboratory The Aerospace Corporation P.O. Box 92957 Los Angeles, CA 90009, U.S.A.

Abstract

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We have analyzed far-IR (IRAS) data for a sample of optically selected Seyfert galaxies. The far-infrared emission is uncorrelated, or at best weakly correlated, with the UV-optical emission from these sources. We find the far-IR emission to be extended in a number of objects. We discuss the possibility that Seyfert galaxies are undergoing circumnuclear bursts of star formation. For comparison with the large aperture IRAS data we have also obtained new ground-based measurements at 10 and 20 μm for a sample of 17 Seyfert galaxies. Conclusive evidence for extended 10 and 20 μm emission is seen in 7 out of 17 objects. In addition, almost all of the objects have ground-based fluxes which are smaller than those measured by IRAS. Finally, for five objects the emission appears to be more extended at 10 μm than at 20 μm. This would be expected if the 10 μm emission arose, in part, from a population of very small grains for which single photon heating is important.

Type
III. Seyfert Galaxies
Information
Symposium - International Astronomical Union , Volume 121: Observational Evidences of Activity of Galaxies , 1987 , pp. 127 - 129
Copyright
Copyright © Reidel 1987 

References

Rodriguez Espinosa, J.M., Rudy, R.J., and Jones, B., 1986, Ap. J., 309, in press.Google Scholar
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