Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.214..429g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 214, June 1, 1985, p. 429-447.
Astronomy and Astrophysics
Astronomy
132
Astronomical Photometry, Infrared Astronomy, Seyfert Galaxies, Astronomical Catalogs, Colorimetry, Cosmic Dust, Galactic Nuclei, H Ii Regions
Scientific paper
Multiaperture JHKL colors are presented for samples of Seyfert 1, Seyfert 2, and H II region galaxies. From the tightness of their distribution in the infrared two-color diagrams, Seyfert 1s are inferred to be a relatively homogeneous group whose colors can be explained by the addition of nuclei with power law spectral distributions to the ordinary background galaxies. H II region galaxies are like ordinary ones affected to some degree by high dust content, giving rise to reddening and/or blackbody emission. Seyfert 2s form an intermediate category, in some cases being like Seyfert 1s with obscuration and in others being like H II galaxies. The properties of H II region galaxies in the U-B, V-K diagram are discussed. Up to 10 percent of the mass of such galaxies appear to have been involved in star formation within the last 100 million years. Most Seyfert 2s behaved similarly, but much longer ago.
Glass S000. I.
Moorwood Alan F. M.
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