Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...166....4m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 166, no. 1-2, Sept. 1986, p. 4-12.
Astronomy and Astrophysics
Astrophysics
80
Continuous Radiation, Galactic Nuclei, Infrared Spectra, Cosmic Dust, H Ii Regions, Infrared Photometry, Star Formation, Thermal Emission
Scientific paper
Low resolution spectra around 3.3 μm have been obtained for 28 galaxy nuclei whose optical emission line spectra range from H II region like to pure Seyfert type 1. The 3.28 μm emission feature has been detected (≥3σ) in 70% of the H II region, 65% of the mixed H II/Seyfert, 18% of the Seyfert 2 and none of the Seyfert 1 nuclei. It appears that the 3.28 μm feature is a useful discriminator between star formation and Seyfert activity in galaxy nuclei. Broadband infrared photometry together with measurements of the Br γ hydrogen recombination line have been used to estimate separately the stellar, free-free and thermal dust emission components of the 3.3 μm continuum in those nuclei exhibiting the 3.28 μm emission feature. Intermediate band photometry around 10 μm reveals structure attributable to the (7.7 μm), 8.6 μm and 11.25 μm features in those cases where the 3.28 μm feature is clearly present.
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