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Published January 1, 1979 | Published
Journal Article Open

The hydrogen lines in the high-luminosity quasar B2 1225+31


The emission lines Hɑ, Hβ + [O III], and Lɑ have been observed in the high-redshift quasar 1225+31. The ratios of line intensities in 1225+31 are found to be Lɑ/Hɑ ~ 0.8, Hɑ/(Hβ + [O III]) ~ 4, and 4 < Hɑ/Hβ < 10. The observed value of Lɑ/Hɑ agrees well with the ratio derived by Baldwin on the basis of a composite quasar spectrum, and with direct determination of this ratio in 3C 273 and PKS 0237-23. The ratio Hɑ/Hβ is in the range of values found for a sample of low-redsh1ft quasars by Baldwin. The low value for the Lɑ/Hɑ ratio cannot be reasonably explained by foreground extmction between the Sun and 1225+31.

Additional Information

© 1979 American Astronomical Society. Received 1978 August 1; accepted 1978 August 31. We thank Steve Beckwith and Gary Tuton for assistance with the infrared observations. This research was supported by NASA grants NGL 05-002-207 and NGL 05-002-134, and NSF grant AST77-20516.

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Published - 1979ApJ___227L___1S.pdf


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