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Limits to Intergalactic Neutral Hydrogen from Photoionization Absorption in Ultraviolet Quasar Spectra
Author(s) -
Dautcourt G.
Publication year - 1983
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.2113040202
Subject(s) - quasar , intergalactic travel , lyman alpha forest , photoionization , lyman limit , physics , redshift , astrophysics , spectral line , intergalactic medium , hydrogen , hydrogen line , astronomy , ionization , galaxy , quantum mechanics , ion
Measurement of the continuum beyond the L YMAN limit in the spectra of highly redshifted quasars allows to put upper limits to intergalactic neutral hydrogen which are comparable to those derived from the G UNN ‐P ETERSON ‐S CHEUER ‐S CHKLOWSKI test. The data apply to a weighted average of neutral hydrogen along the whole line of sight to the quasar, not to a small region around the quasar as in the GPSS test. Some conclusions are derived for a possible clumped component of neutral hydrogen in different F RIEDMAN models.
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