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20 April 2024

» arxiv » astro-ph/9711143

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The He II Opacity of the Lyman-alpha Forest and the Intergalactic Medium
Wei Zheng ; Arthur F. Davidsen ; Gerard A. Kriss ;
Date:	12 Nov 1997
Subject:	astro-ph
Affiliation:	Johns Hopkins University
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.
Source:	arXiv, astro-ph/9711143
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