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

Soifer, B. T. and Oke, J. B. and Matthews, K. and Neugebauer, G. (1979) The hydrogen lines in the high-luminosity quasar B2 1225+31. Astrophysical Journal, 227 (2). L1-L3. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20170303-153446709

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/182854DOIArticle
http://adsabs.harvard.edu/abs/1979ApJ...227L...1SADSArticle
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.
Funders:
Funding AgencyGrant Number
NASANGL 05-002-207
NASANGL 05-002-134
NSFAST 77-20516
Subject Keywords:line formation quasars
Issue or Number:2
Record Number:CaltechAUTHORS:20170303-153446709
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170303-153446709
Official Citation:The hydrogen lines in the high-luminosity quasar B2 1225+31 Soifer, B. T., Oke, J. B., Matthews, K., & Neugebauer, G. Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Jan. 1, 1979, p. L1-L3.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74736
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:06 Mar 2017 15:57
Last Modified:03 Oct 2019 16:42

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