Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...100l..16m&link_type=abstract
Astronomy and Astrophysics, vol. 100, no. 2, July 1981, p. L16-L19.
Astronomy and Astrophysics
Astronomy
12
Astronomical Photometry, Cosmic Dust, Galactic Nuclei, Infrared Astronomy, Seyfert Galaxies, Emission Spectra, Infrared Spectra, Signal To Noise Ratios
Scientific paper
Detections are reported of the 3.3-micron emission feature in the nuclei of IC 4329A, and extreme Seyfert 1 galaxy, and NGC 5506, a narrow line X-ray galaxy which may contain a heavily obscured Seyfert 1 nucleus. It is thought probable that this feature originates in mantles on a population of small dust grains at temperatures around 300 K which may contribute substantially to the infrared continua of these galaxies. In the case of IC 4329A, evidence provided by the large width of the observed feature that the grains responsible could be located within the broad line region is discussed. Observations of NGC 5506 made around 10 microns are found to be compatible with the presence of significant absorption by silicate dust.
Moorwood Alan F. M.
Salinari Piero
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