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Published 1980 | Published
Book Section - Chapter Open

Low resolution infrared spectra of quasars


Low resolution spectra of a significant sample of quasars show that the Paschen α and Balmer line ratios do not agree with the radiative recombination case B result and vary widely within the quasars sampled. The range in Pα:Hβ ratios is a factor of ~6, while the range in Lyα:Hα ratios is a factor of ~5. For the Pα:Balmer series, the deviations from case B recombination are not consistent with reddening, but appear, within large dispersions, to be consistent with optical depth effects in the Balmer lines affecting the line ratios. The Lyα:Hα ratio is, however, correlated with the continuum spectral index, and can be explained as due to reddening affecting both the lines and continuum.

Additional Information

© 1980 by the IAU. This work was supported by NSF grant AST77-20516 and NASA grant NGL 05-002-207.

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Published - 1980IAUS___92__279S.pdf


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August 19, 2023
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