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Constraints on the Unseen Galaxy Population from the Lyα Forest

Published online by Cambridge University Press:  12 April 2016

Kenneth M. Lanzetta ,
Hsiao-Wen Chen ,
John K. Webb  and
Xavier Barcons
Kenneth M. Lanzetta
Affiliation:
Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, NY 11794-3800, U.S.A.
Hsiao-Wen Chen
Affiliation:
Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, NY 11794-3800, U.S.A.
John K. Webb
Affiliation:
School of Physics, University of New South Wales, Sydney 2052, NSW, AUSTRALIA
Xavier Barcons
Affiliation:
Instituto de Física de Cantabria(Consejo Superior de Investigaciones Científicas—Universidad de Cantabria), Facultad de Ciencias, 39005 Santander, SPAIN

Abstract

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Here we describe results of our attempt to determine what types of galaxies are responsible for the Lyα forest absorption systems, based on our ongoing imaging and spectroscopic survey of faint galaxies in fields of HST spectroscopic target QSOs. Our primary conclusions are that the bulk of the Lyα forest arises in more or less normal galaxies (that span the normal range of luminosity and morphology) and that any “unseen” low surface brightness galaxies are unlikely to contribute significantly to the luminosity density of the universe.

Type
Observational selection effects
Information
International Astronomical Union Colloquium , Volume 171: The Low Surface Brightness Universe , 1999 , pp. 35 - 42
Copyright
Copyright © Astronomical Society of the Pacific 1999

References

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