The He II Opacity of the Lyman-alpha Forest and the Intergalactic Medium

Details The He II Opacity of the Lyman-alpha Forest and the Intergalactic Medium The He II Opacity of the Lyman-alpha Forest and the Intergalactic Medium

1997-11-12

arxiv.org/abs/astro-ph/9711143v1

Astronomy and Astrophysics

Astrophysics

18 pages, including 4 figures To appear in A.J., February 1998

Scientific paper

10.1086/300230

Based on the empirical formulas governing the distribution of Ly-a forest
absorption, we use a Monte-Carlo technique to calculate the average HeII
optical depth produced by these forest lines. A substantial contribution to
HeII absorption arises from extremely tenuous regions of intergalactic gas that
are beyond the observational limits for HI absorption.

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