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Infrared, optical, and ultraviolet observations of hydrogen line emission from Seyfert galaxies

Lacy, J. H. and Malkan, M. and Becklin, E. E. and Soifer, B. T. and Neugebauer, G. and Matthews, K. and Wu, C.-C. and Boggess, A. and Gull, T. R. (1982) Infrared, optical, and ultraviolet observations of hydrogen line emission from Seyfert galaxies. Astrophysical Journal, 256 . pp. 75-82. ISSN 1538-4357. http://resolver.caltech.edu/CaltechAUTHORS:20170307-143229644

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Abstract

Nearly simultaneous observations are reported of Pɑ, Hɑ, and Hβ emission from 18 Seyfert galaxies and of Lyɑ from eight of these galaxies. In many cases, Pɑ is stronger relative to the Balmer lines than is predicted by recombination calculations; reddening appears to be required. Dispersion in the Pɑ/Hɑ/Hβ 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 Pɑ/Hɑ ratios. High densities, large optical depths, and reddening probably all contribute to the low observed Lɑ/Hβ ratios.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/1086/159884DOIArticle
http://adsabs.harvard.edu/abs/1982ApJ...256...75LADSArticle
Additional Information:© 1982 American Astronomical Society. Received 1981 September 25; accepted 1981 November 13. We thank W. L. W. Sargent, A. G. deBruyn, A. C. S. Readhead, and J.B. Oke for supplying optical spectra used in this paper and R. C. Puetter for helpful criticism. We are also grateful for the assistance of Juan Carrasco, Howard Lanning, Ron Koehler, Frank Cheigh, and the crew of the Kuiper Airborne Observatory. This work was supported by grants from the NSF and NASA.
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Subject Keywords:galaxies: Seyfert infrared: sources ultraviolet: spectra
Record Number:CaltechAUTHORS:20170307-143229644
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170307-143229644
Official Citation:Infrared, optical, and ultraviolet observations of hydrogen line emission from Seyfert galaxies Lacy, J. H., Malkan, M., Becklin, E. E., Soifer, B. T., Neugebauer, G., Matthews, K., , Astrophysical Journal, Part 1, vol. 256, May 1, 1982, p. 75-82.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74866
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:07 Mar 2017 22:45
Last Modified:07 Mar 2017 22:45

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