8-13 micron spectrophotometry of galaxies. II - 10 Seyferts and 3C 273

Details 8-13 micron spectrophotometry of galaxies. II - 10 Seyferts and 3C 273 8-13 micron spectrophotometry of galaxies. II - 10 Seyferts and 3C 273

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.207...35r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 207, March 1, 1984, p. 35-45. Research supported by the

Astronomy and Astrophysics

Astronomy

74

Galactic Nuclei, Infrared Astronomy, Quasars, Seyfert Galaxies, Spectrophotometry, Dust, Emission Spectra, H Ii Regions, Silicates, X Ray Sources

Scientific paper

Spectra at 8-13 micron of 10 Seyfert galaxy nuclei, roughly equally divided between types 1 and 2 and the quasar 3C 273, are presented. These sources show no evidence for dust emission features, with the exception of the type 2 Seyfert NGC 7582, which does show the narrow dust emission features at 8.65 and 11.25 micron. Two of the other type 2 Seyferts, NGC 1068 and 5506, have minima near 10 micron, attributed to absorption by cold silicate dust. The remainder have smooth featureless spectra well fit by power laws. The lack of dust emission features is in remarkable contrast to nonactive galaxy nuclei and luminous Galactic H II regions. If dust emission is responsible for the radiation from Seyfert nuclei and from 3C 273, silicate grains are absent or are too cold to radiate significantly below 13 micron while any infrared featureless grains are required to radiate strongly and must exist over a wide range of temperatures.

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