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Title:
Infrared, optical, and ultraviolet observations of hydrogen line emission from Seyfert galaxies
Authors:
Lacy, J. H.; Soifer, B. T.; Neugebauer, G.; Matthews, K.; Malkan, M.; Becklin, E. E.; Wy, C. C.; Boggess, A.; Gull, T. R.
Affiliation:
AA(California Institute of Technology; Palomar Observatory, Pasadena, CA), AB(California Institute of Technology; Palomar Observatory, Pasadena, CA), AC(Hawaii, University, Honolulu, HI)
Publication:
Astrophysical Journal, Part 1, vol. 256, May 1, 1982, p. 75-82. NSF-NASA-supported research. (ApJ Homepage)
Publication Date:
05/1982
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
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
DOI:
10.1086/159884
Bibliographic Code:
1982ApJ...256...75L

Abstract

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.

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