| 单词 | gunn-peterson test |
| 释义 | Gunn-Peterson testGunn–Peterson testA test for the presence of neutral hydrogen and singly-ionized helium in the diffuse intergalactic medium, first proposed by J.E. Gunn and B.A. Peterson in 1965. Such hydrogen and helium are expected to cause absorption of a quasar continuum shortward of its rest-frame Lyman emission lines; the fact that this continuum is detected (in between the Lyman-alpha forest) reveals that most of the IGM is already highly ionized, at least to a redshift of 4–5. |
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