Galaxy formation and the origin of the ionizing flux at large redshift

Details Galaxy formation and the origin of the ionizing flux at large redshift Galaxy formation and the origin of the ionizing flux at large redshift

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348..371s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 10, 1990, p. 371-377.

Astronomy and Astrophysics

Astrophysics

109

Cosmology, Galactic Evolution, Ionizing Radiation, Red Shift, Universe, Astronomical Spectroscopy, Brightness Distribution, Lyman Alpha Radiation, Spectral Energy Distribution

Scientific paper

The absence of any continuous Ly-alpha opacity from the intergalactic medium at z = 3-4.5 can be understood if a significant population of star-forming galaxies is present at these redshifts. It is shown that such galaxies can be present within the galaxy populations at B = 22 to 27. The expected ionization produced during galaxy formation is analyzed in terms of highly model-independent metal production arguments and it is concluded that (if such galaxies are dust-free and transparent to ionizing photons) then at least 4(H0/50 km/s Mpc)-cubed percent of galaxy formation would have to have occurred in this redshift range.

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