Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...254..489n&link_type=abstract
Astrophysical Journal, Part 1, vol. 254, Mar. 15, 1982, p. 489-493. United States-Israel Binational Science Foundation
Astronomy and Astrophysics
Astrophysics
20
Astronomical Spectroscopy, H Beta Line, Lyman Alpha Radiation, Quasars, Spectral Line Width, Astronomical Models, Iue, Line Of Sight, Ultraviolet Spectra, Visible Spectrum
Scientific paper
3C 351 is the only quasar so far in which the broad and narrow components of Ly-alpha and H-beta can be easily separated. The combination of Ly-alpha from previous IUE data and our new optical observations suggests that Ly-alpha/H-beta is equal to about 12 in both components. By comparing this line ratio with the results of a photoionization calculation for the narrow-line region, a line-of-sight reddening E (B-V) value of approximately 0.25, most of which is probably intrinsic, is found. Applying this reddening to the observed broad emission lines gives an intrinsic intensity ratio Ly-alpha/H-beta of about 52, indicating that collisional enhancement of H-beta may not be important. The intrinsic intensity ratio H-alpha/H-beta of about 14 is like that observed in some broad-line radio galaxies, suggesting that some quasars may be very luminous members of that class.
Netzer Hagai
Wills Beverley J.
Wills Danielle
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