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Extragalactic optical and near-infrared foregrounds to 21-cm epoch of reionisation experiments

Published online by Cambridge University Press:  08 May 2018

Matt J. Jarvis ,
Rebecca A.A. Bowler  and
Peter W. Hatfield
Matt J. Jarvis
Affiliation:
Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK email: [email protected] Astrophysics Group, Department of Physics, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa
Rebecca A.A. Bowler
Affiliation:
Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK email: [email protected]
Peter W. Hatfield
Affiliation:
Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK email: [email protected]
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Abstract

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Foreground contamination is one of the most important limiting factors in detecting the neutral hydrogen in the epoch of reionisation. These foregrounds can be roughly split into galactic and extragalactic foregrounds. In these proceedings we highlight information that can be gleaned from multi-wavelength extragalactic surveys in order to overcome this issue. We discuss how clustering information from the lower-redshift, foreground galaxies, can be used as additional information in accounting for the noise associated with the foregrounds. We then go on to highlight the expected contribution of future optical and near-infrared surveys for detecting the galaxies responsible for ionising the Universe. We suggest that these galaxies can also be used to reduce the systematics in the 21-cm epoch of reionisation signal through cross-correlations if enough common area is surveyed.

Keywords

galaxies: evolutiongalaxies: high-redshiftcosmology: early universecosmology: large-scale structure of the universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S333: Peering towards Cosmic Dawn , October 2017 , pp. 183 - 190
Copyright
Copyright © International Astronomical Union 2018 

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