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arxiv: astro-ph/9711143 · v1 · submitted 1997-11-12 · 🌌 astro-ph

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

classification 🌌 astro-ph
keywords absorptionforestheiiintergalacticarisesaveragebeyondcalculate
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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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