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Published May 1990 | Published
Journal Article Open

The size of NGC 4151 at 11.2 µm


The size of the emission region of NGC 4151 at 11.2 µm has been measured to be 0.16" + 0.04" (lσ). This size is in agreement with that expected from thermal emission from dust grains heated by a central luminosity source, but is inconsistent with nonthermal emission.

Additional Information

© 1990 American Astronomical Society. Received 9 November 1989; revised 5 January 1990. We thank all the staff at the Palomar Observatory for their support and efforts in making these measurements possible. We also thank J. McGill for his efforts in obtaining these observations, Sterl Phinney and an anonymous referee for their comments on the text and G. Fox for discussion about the analysis. G.X.N. thanks the Institute for Advanced Study in Princeton, and especially J. Bahcall, for their hospitality while this was written. Ground-based infrared astronomy at Caltech is supported by a grant from the NSF.

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Published - 1990AJ_____99_1456N.pdf


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