Other
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262..273m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 2, p. 273-276.
Other
44
Absorption Spectra, Helium Atoms, Intergalactic Media, Lyman Alpha Radiation, Quasars, Hydrogen Atoms, Red Shift
Scientific paper
The flux of a quasar below a rest-frame wavelength of 304 A (the Ly-alpha line of He II) should be reduced owing to the He II Gunn-Peterson effect and the He II absorption lines of the Ly-alpha forest. This region of the spectrum may soon be observed for high-redshift quasars with the HST, HUT and other satellites. The predicted decrement depends mainly on the spectrum of the ionizing background at high redshift. If this background is produced by quasars with a power-law spectrum joining their observed UV and X-ray luminosities, the He II decrement should be about four times larger than the decrement of the H I Ly-alpha forest, being a factor of about 3 at z = 3, and should be easily seen on any quasar detected down to the He II Ly-alpha wavelength. The observation of a significantly lower decrement would imply that the sources producing the ionizing background have a harder spectrum than in the simple case mentioned above.
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