Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...256...75l&link_type=abstract
Astrophysical Journal, Part 1, vol. 256, May 1, 1982, p. 75-82. NSF-NASA-supported research.
Astronomy and Astrophysics
Astronomy
82
Galactic Radiation, H Lines, Infrared Astronomy, Lyman Alpha Radiation, Seyfert Galaxies, Ultraviolet Spectra, Balmer Series, Emission Spectra, Galactic Nuclei, Infrared Telescopes, Interstellar Extinction, Iue, Quasars, Radiant Flux Density, Radio Galaxies, Visual Observation
Scientific paper
Nearly simultaneous observations are reported of P-alpha, H-alpha, and H-beta emission from 18 Seyfert galaxies and of Ly-alpha from eight of these galaxies. In many cases, P-alpha is stronger relative to the Balmer lines than is predicted by recombination calculations; reddening appears to be required. Dispersion in the P-alpha/H-alpha/H-beta ratios orthogonal to the reddening track indicates that high densities or optical depths also affect the line flux ratios. Several galaxies, notably NGC 1275, have very low P-alpha/H-alpha ratios. High densities, large optical depths, and reddening probably all contribute to the low observed Ly-alpha/H-beta ratios.
Becklin Eric E.
Boggess Albert
Gull Ted R.
Lacy John H.
Malkan Matthew
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