The He II Opacity of the Lyman-alpha Forest and the Intergalactic Medium
Preprint
- 12 November 1997
Abstract
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.Keywords
All Related Versions
- Version 1, 1997-11-12, ArXiv
- Published version: The Astronomical Journal, 115 (2), 391.
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