Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45l...1d&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 45, no. 1, p. L1-L6.
Astronomy and Astrophysics
Astronomy
4
Absorption Spectra, Ionization, Metallicity, Quasars, Astronomical Spectroscopy, Diffuse Radiation, Galactic Evolution, Galactic Halos, Red Shift, Ultraviolet Radiation
Scientific paper
We studied the ionization state of the metallic absorption-line systems of quasar spectra while assuming that the metallic lines arise in gaseous halos of high red-shift galaxies. Compared with the observed absorption-line systems, we obtained constraints on both the intensity and spectral shape of UV radiation, such that the Lyman-limit intensity of the diffuse UV background is I(nu)LL = 10 exp -21.0 +/- 0.5 erg/sq cm per sec per Hz per sr at z about 2 and its spectral shape is I(nu proportional to nu exp -alpha with values of alpha being between 1 and 2. Since stellar UV radiation could reproduce only a small part of the observed data, it is concluded that quasars would be the dominant source of UV radiation at high red shifts, although contributions from young galaxies cannot be ruled out.
Denda Kiyomi
Ikeuchi Satoru
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