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Published June 2004 | Published
Journal Article Open

High Spatial Resolution Mid‐Infrared Observations of Five Seyfert Galaxies


High spatial resolution images at 12.5 μm of the nuclei of five nearby Seyfert galaxies—I Zwicky 1, NGC 1320, NGC 2992, M81, and NGC 7479—have been obtained with the 10 m Keck Telescope. The angular size limits indicate that under typical conditions the Keck Telescope shows an unresolved nucleus for these active galactic nuclei. In all cases, the lower limit to the infrared surface brightness is above 3 × 10^(12) L_⊙ kpc^(−2); this argues that nuclear starbursts do not contribute significantly to the infrared luminosities in these nuclei.

Additional Information

© 2004. The Astronomical Society of the Pacific. Received 2004 January 3. Accepted 2004 March 8. Published 2004 May 11. We thank the staff of the Keck Observatory for their assistance in making these observations possible. The W. M. Keck Observatory is operated as a scientific partnership between the California Institute of Technology, the University of California, and NASA. It was made possible by the generous financial support of the W. M. Keck Foundation. We extend special thanks to those of Hawaiian ancestry on whose sacred mountain we are privileged to be guests. Without their generous hospitality, none of the observations presented herein would have been possible. B. T. S. and E. E. were supported by grants from the NSF and NASA. B. T. S. and L. A. are supported by the Spitzer Science Center at Caltech. Spitzer is carried out at the Jet Propulsion Laboratory (JPL), which is operated by Caltech under an agreement with NASA. This research has made use of the NASA/IPAC Extragalactic Database, which is operated by JPL, California Institute of Technology, under contract with NASA.

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