Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pasp..101..691c&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 101, Aug. 1989, p. 691-694.
Astronomy and Astrophysics
Astronomy
Active Galactic Nuclei, Cosmic Dust, H Lines, Infrared Astronomy Satellite, Interstellar Matter, Seyfert Galaxies, Infrared Radiation, Luminosity
Scientific paper
Published H-alpha/H-beta ratios and infrared-to-visual flux ratios are examined as potential diagnostics for dust in Seyfert I galaxies, Seyfert 2 galaxies, and QSOs. H-alpha/H-beta ratio distributions are very broad although some subtle distinctions may be evident among the various classes of objects. The distributions of the ratio of about 10-micron luminosity to that at visual-ultraviolet wavelengths are more narrow, and clear distinctions are evident among the various types of object. Clearly both H-alpha/H-beta and infrared emission together help determine the obscuring effects of dust. More homogeneous data are desirable but will require considerably large telescope observing time in order to pursue these results further.
Congdon Charles
Stein Wayne A.
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