What produces the ionizing background at large redshift?

Details What produces the ionizing background at large redshift? What produces the ionizing background at large redshift?

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350....1m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 350, Feb. 10, 1990, p. 1-22.

Astronomy and Astrophysics

Astronomy

211

Background Radiation, Intergalactic Media, Ionizing Radiation, Quasars, Red Shift, Astronomical Models, Galactic Evolution, Ultraviolet Astronomy

Scientific paper

Results are presented from mathematical and modeling studies to make estimates of the intensity of the ionizing background more definite and quantitative. It is shown that the observed quasars fail to emit sufficient ionizing radiation to satisfy the Gunn-Peterson test. Two possible sources for the additional source of UV radiation are examined: main-sequence, high mass stars in primordial galaxies and quasars that have not been observed because of dust obscuration. Both of these models satisfy the observational constraints with reasonable parameters. It is suggested that observations of He lines from Ly-alpha clouds or an analysis of the line ratios in metal line absorption systems may be used to determine which sources produce the ionizing background.

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