Evidence from sub-millimetre observations for thermal dust emission in NGC4151

Edelson, R. A., Gear, Walter Kieran ORCID: https://orcid.org/0000-0001-6789-6196, Malkan, M. A. and Robson, E. I. 1988. Evidence from sub-millimetre observations for thermal dust emission in NGC4151. Nature 336 , pp. 749-751. 10.1038/336749a0

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Abstract

Most quasars and Seyfert 1 galaxies have spectra that rise from optical wavelengths into the 60–100 μm infrared region, beyond which they must suffer a sharp cutoff indicated by the lack of observed millimetre emission. There is evidence1–4 that the infrared emission receives contributions from both thermal emission by interstellar dust and synchrotron radiation from a compact source. Determining the nature of the infrared emission is thus an important step in understanding the structure of quasars and Seyfert 1 galaxies. We report here observations at 438-μm wavelength of the Seyfert 1 galaxy NGC4151 using the UKT14 bolometer on the James Clerk Maxwell Telescope. We find a 5σ upper limit of 200 mJy in an 11″ aperture. Comparison with an earlier measurement at 155-μm indicates that at least half of the 155-μm flux is due to thermal dust emission. The remainder may be from a synchrotron source which becomes self-absorbed at wavelengths of less than 80 μm.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	Macmillan Publishers Ltd.
ISSN:	0028-0836
Last Modified:	21 Oct 2022 09:25
URI:	https://orca.cardiff.ac.uk/id/eprint/36357

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