Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242...14w&link_type=abstract
Astrophysical Journal, Part 1, vol. 242, Nov. 15, 1980, p. 14-17.
Astronomy and Astrophysics
Astronomy
40
H Beta Line, Lyman Alpha Radiation, Quasars, Radiant Flux Density, Seyfert Galaxies, Ultraviolet Astronomy, Cosmic Dust, H Alpha Line, Image Processing, Red Shift, Ultraviolet Spectra, Ultraviolet Spectrometers
Scientific paper
The International Ultraviolet Explorer (IUE) was used to measure Ly-alpha fluxes for 13 type 1 Seyferts, one type 2 Seyfert, and one low-redshift quasar. The observed Ly-alpha/H-beta ratio is typically 5 for the type 1 Seyfert galaxies but is 20 for the single type 2 Seyfert. In the Ly-alpha/H-beta versus H-alpha/H-beta diagram, the observations do not preferentially fall along any characteristic reddening line, indicating a considerable range of intrinsic line ratios. Much of the low Ly-alpha/H-beta ratio is intrinsic to the broad-line region; external dust plays a significant role in only a few objects. For type 1 Seyferts and low-redshift QSOs, the intrinsic line ratios are limited to Ly-alpha/H-beta less than 20, and H-alpha/H-beta greater than approximately 2.8.
Boggess Albert
Gull Ted R.
Wu Congjun
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