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Driftscan Surveys in the 21 cm Line with the Arecibo and Nançay Telescopes

Published online by Cambridge University Press:  05 March 2013

F. H. Briggs ,
E. Sorar ,
R. C. Kraan-Korteweg  and
W. van Driel
F. H. Briggs
Affiliation:
Kapteyn Astronomical Institute, Post bus 800, 9700 AV Groningen, The Netherlands; fbriggs@astro.rug.nl
E. Sorar
Affiliation:
University of Pittsburgh, Pittsburgh, PA 15260, USA
R. C. Kraan-Korteweg
Affiliation:
DAEC, Observatoire de Paris-Meudon, 92195, Meudon Cedex, France
W. van Driel
Affiliation:
USN, Observatoire de Paris-Meudon, 92195, Meudon Cedex, France
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Abstract

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Driftscan methods are highly efficient, stable techniques for conducting extragalactic surveys in the 21 cm line of neutral hydrogen. Holding the telescope still while the beam scans the sky at the sidereal rate produces exceptionally stable spectral baselines, increased stability for RFI signals, and excellent diagnostic information about system performance. Data can be processed naturally and efficiently by grouping long sequences of spectra into an image format, thereby allowing thousands of individual spectra to be calibrated, inspected and manipulated as a single data structure with standard tools that already exist in astronomical software. The behaviour of spectral standing waves (multi-path effects) can be appraised and excised in this environment, making observations possible while the Sun is up. The method is illustrated with survey data from Arecibo and Nançay.

Keywords

methods: data analysistechniques: image processing telescopessurveysgalaxies: distances and redshiftsradio lines: galaxies
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 14 , Issue 1 , 1997 , pp. 37 - 44
Copyright
Copyright © Astronomical Society of Australia 1997

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