Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..320b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Nov. 15, 1991, p. 320-340.
Astronomy and Astrophysics
Astronomy
11
Galactic Radiation, Interstellar Matter, Ionizing Radiation, Supernova Remnants, Ultraviolet Radiation, Color-Magnitude Diagram, Continuous Radiation, Lyman Alpha Radiation, Massive Stars, Red Shift
Scientific paper
The effect of supernova remnants (SNR) on the UV continuum of galaxies is estimated. It is shown that the radiation from the remnants may lead to a very small rest frame Lyman break. The appearance of such galaxies at high redshift is calculated, and it is concluded that even galaxies with negligible rest frame Lyman break will have large observed breaks because of absorption by intervening Ly-alpha clouds. Star-forming galaxies at high redshifts may thus supply the ionizing radiation background without this radiation being observable in the spectrum. Emission from SNR also leads to a much harder galactic spectrum, especially shortward of 228 A. This means that high-ionization lines observed in high-redshift radio galaxies or metal line systems may result from photo-ionization by hard radiation emerging from hot SNR.
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