Surveys David Valls--Gabaud, PASA, 15 (1), 111
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Next Section: Diffuse H emission and
Cosmological Applications of H
Surveys
David Valls-Gabaud 
UMR CNRS 7550, Observatoire de Strasbourg, 11 Rue de l'Universitц©, F-67000 Strasbourg
Royal Greenwich Observatory, Madingley Road, Cambridge CB3 0EZ, UK
Email : dvg@astro.u-strasbg.fr dvg@ast.cam.ac.uk
Abstract:
We briefly review three main applications of H surveys in cosmology, namely : (1) The diffuse H emission as a tracer of the free-free foreground that contaminates the fluctuations in the cosmic microwave background radiation; (2) The H emission from galaxies as a measure of the formation rate of massive stars, both at low and high redshift; (3) The diffuse H emission from ionised clouds as a constraint on the local ionising background radiation.
Keywords: Cosmology : CMBR fluctuations, ionising background radiation - Galaxies : star formation rate
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