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Limits to Intergalactic Neutral Hydrogen from Photoionization Absorption in Ultraviolet Quasar Spectra

Georg Dautcourt

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Abstract

Abstract Measurement of the continuum beyond the LYMAN 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 GUNN‐PETERSON‐SCHEUER‐SCHKLOWSKI 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 FRIEDMAN models.

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What this paper is about

Abstract Measurement of the continuum beyond the LYMAN 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 GUNN‐PETERSON‐SCHEUER‐SCHKLOWSKI 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 FRIEDMAN models.

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Available abstract

Abstract Measurement of the continuum beyond the LYMAN 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 GUNN‐PETERSON‐SCHEUER‐SCHKLOWSKI 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 FRIEDMAN models.

Key concepts: Quasar, Intergalactic travel, Lyman-alpha forest, Photoionization, Lyman limit, Physics, Redshift, Astrophysics

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