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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