Far-ultraviolet and optical spectrophotometry of X-ray selected Seyfert galaxies

Details Far-ultraviolet and optical spectrophotometry of X-ray selected Seyfert galaxies Far-ultraviolet and optical spectrophotometry of X-ray selected Seyfert galaxies

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...305..167c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 305, June 1, 1986, p. 167-174.

Astronomy and Astrophysics

Astrophysics

8

Astronomical Spectroscopy, Far Ultraviolet Radiation, Seyfert Galaxies, Ultraviolet Spectroscopy, X Ray Sources, Emission Spectra, Galactic Nuclei, Iue, Lyman Alpha Radiation, Lyman Beta Radiation, Spectral Line Width, Spectrum Analysis, Visible Spectrum

Scientific paper

Five X-ray selected Seyfert galaxies were examined via near-simultaneous far-ultraviolet and optical spectrophotometry in an effort to test models for excitation of emission lines by X-ray and ultraviolet continuum photoionization. The observed Ly-alpha/H-beta ratio in the present sample averages 22, with an increase found toward the high-velocity wings of the H lines in the spectrum of at least one of the Seyfert I nuclei. It is suggested that Seyfert galaxies with the most high-velocity gas exhibit the highest Ly-alpha/H-beta ratios at all velocities in the line profiles, and that sometimes this ratio may be highest for the highest velocity material in the broad-line clouds. Since broad-lined objects are least affected by Ly-alpha trapping effects, they have Ly-alpha/H-beta ratios much closer to those predicted by early photoionization calculations.

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