In astronomical spectroscopy, the Gunn–Peterson trough is a feature of the spectra of bright high redshift sources, particularly quasars and gamma-ray burst afterglows, due to the presence of neutral hydrogen in the Intergalactic medium (IGM) before the epoch of reionization. The trough is characterized by suppression of electromagnetic emission from the source at wavelengths just below that of a redshifted Lyman series line.
In astronomical spectroscopy, the Gunn–Peterson trough is a feature of the spectra of bright high redshift sources, particularly quasars and gamma-ray burst afterglows, due to the presence of neutral hydrogen in the Intergalactic medium (IGM) before the epoch of reionization. The trough is characterized by suppression of electromagnetic emission from the source at wavelengths just below that of a redshifted Lyman series line.
Source: Wikipedia "Gunn–Peterson trough" · CC BY-SA 4.0
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