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Title:
The hydrogen lines in the high-luminosity quasar B2 1225+31
Authors:
Soifer, B. T.; Oke, J. B.; Matthews, K.; Neugebauer, G.
Affiliation:
AA(California Institute of Technology, Pasadena, Calif.), AB(California Institute of Technology, Pasadena, Calif.), AC(California Institute of Technology, Pasadena, Calif.), AD(California Institute of Technology, Pasadena, Calif.)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Jan. 1, 1979, p. L1-L3. (ApJL Homepage)
Publication Date:
01/1979
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
H Lines, Luminosity, Quasars, Forbidden Transitions, Line Spectra, Red Shift
DOI:
10.1086/182854
Bibliographic Code:
1979ApJ...227L...1S

Abstract

The emission lines H-alpha, H-beta + forbidden O III, and L-alpha have been observed in the high-redshift quasar 1225+31. The ratios of line intensities in 1225+31 are found to be approximately 0.8 for L-alpha/H-alpha, about 4 for H-alpha/(H-beta + forbidden O III), and between 4 and 10 for H-alpha/H-beta. The observed value of L-alpha/H-alpha agrees well with the ratio derived by Baldwin (1977) on the basis of a composite quasar spectrum, as well as with direct determination of this ratio in 3C 273 and PKS 0237-23. The ratio H-alpha/H-beta is in the range of values found for a sample of low-redshift quasars by Baldwin (1975). The low value for the L-alpha/H-alpha ratio cannot be reasonably explained by foreground extinction between the sun and 1225+31.

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