Lyman-Alpha Forest
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In astronomical spectroscopy, the Lyman alpha forest is the sum of absorption lines arising from the Lyman alpha transition of the neutral hydrogen in the spectra of distant galaxies and quasars.These absorption lines result from intergalactic gas through which the galaxy or quasar's light has travelled. Since the absorption and emission of light follow the laws of quantum mechanics, only photons with specific energies can be absorbed. This causes each individual absorption line. The forest is created by the fact that photons that come to us from distant light sources show Hubble redshift that...
In astronomical spectroscopy, the Lyman alpha forest is the sum of absorption lines arising from the Lyman alpha transition of the neutral hydrogen in the spectra of distant galaxies and quasars.These absorption lines result from intergalactic gas through which the galaxy or quasar's light has travelled. Since the absorption and emission of light follow the laws of quantum mechanics, only photons with specific energies can be absorbed. This causes each individual absorption line. The forest is created by the fact that photons that come to us from distant light sources show Hubble redshift that depends on the distance between us and the source of light.Since neutral hydrogen clouds at different positions between Earth and the distant light source see the photons at different wavelengths, each individual cloud leaves its fingerprint as an absorption line at a different position in the spectrum as observed on Earth.
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