Abstract The average ultraviolet continuum slope in quasars steepens smoothly to higher frequencies. The slope just beyond Lyα is 1.15. The observations indicate that the intrinsic slope of the ionizing continuum is at least this steep. A simple argument by Natzer /1/ based on the broad-emission-line energy budget appears to imply an ionizing slope of 0.7. However, realistic photoionization models reveal that the key assumption in Netzer's method—that one Lyα photon is produced for every ionizing photon—is freqently not satisfied. Because of this uncertainty, the emission line energy budget is rather insensitive to the far-ultraviolet slope. The average line spectrum is in fact consistent with the 1.1 slope indicated by the observations.


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    Titel :

    Observational and theoretical estimates of the intrinsic slope of the ionizing continuum in quasars


    Beteiligte:
    Malkan, M.A. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    01.01.1988


    Format / Umfang :

    4 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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