Lyman-alpha emission from the Lyman-alpha forest

Astronomy and Astrophysics – Astronomy

Scientific paper

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Background Radiation, Emission Spectra, Line Spectra, Lyman Alpha Radiation, Molecular Clouds, Quasars, Astronomical Spectroscopy, Interstellar Matter, Red Shift

Scientific paper

It is suggested that high-dispersion long-slit spectra or very narrow-band etalon images of 'blank' sky could reveal patches of Ly-α line emission from the population of clouds whose absorption produces the 'Ly-α forest' in QSO spectra. A non-observation can put limits on the ionizing background at high redshift which are better than those obtainable by direct measurements of background light.

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