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Cosmological Applications of Hα Surveys

Published online by Cambridge University Press:  16 May 2016

David Valls–Gabaud
David Valls–Gabaud*
Affiliation:
UMR CNRS 7550, Observatoire de Strasbourg, 11 Rue de l'Université, 67000 Strasbourg, France Royal Greenwich Observatory, Madingley Road, Cambridge CB3 0EZ, UK; [email protected]
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Abstract

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We briefly review three main applications of Hα surveys in cosmology, namely: (1) the diffuse Hα emission as a tracer of the free–free foreground that contaminates the fluctuations in the cosmic microwave background radiation; (2) the Hα emission from galaxies as a measure of the formation rate of massive stars, both at low and high redshift; and (3) the diffuse Hα emission from ionised clouds as a constraint on the local ionising background radiation.

Keywords

cosmology: CMBR fluctuations, ionising background radiationgalaxies: star formation rate
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 15 , Issue 1 , 1998 , pp. 111 - 117
Copyright
Copyright © Astronomical Society of Australia 1998

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