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Evolution of the EUV Background from Quasar Absorption Line Studies

Published online by Cambridge University Press:  25 May 2016

Jill Bechtold
Jill Bechtold*
Affiliation:
Steward Observatory, University of Arizona, Tucson, AZ 85721

Abstract

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The integrated extreme ultraviolet (EUV) radiation from quasars and other high redshift sources provides an ambient ionizing radiation field which may photoionize the gas seen as quasar absorption lines. In particular, the observed evolution of the Lyα forest clouds probably results in part from the evolution of the EUV metagalactic field. Estimates of the EUV field as a function of redshift can be made from measuring the “proximity effect” in quasar spectra; uncertainties in these estimates may be large. Given the uncertainties, the estimated EUV field at z≈3 derived from the proximity effect is in reasonable agreement with the expected contribution from luminous quasars.

Type
Part I: Invited Reviews
Information
Symposium - International Astronomical Union , Volume 168: Examining the Big Bang and the Diffuse Background Radiations , 1996 , pp. 237 - 244
Copyright
Copyright © Kluwer 1996 

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