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

  • F. H. Briggs (a1), E. Sorar (a2), R. C. Kraan-Korteweg (a3) and W. van Driel (a4)
Abstract
Abstract

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.

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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

F. H. Briggs 1997, PASA, 14, 31

J. N. Chengalur , R. Giovanelli , & M. P. Haynes 1995, AJ, 109, 2415

R. Giovanelli , & M. P. Haynes 1989, ApJ, 346, L5

S. E. Schneider 1989, ApJ, 343, 94

M. Zwaan , D. Sprayberry , & F. H. Briggs 1997, PASA, 14, 117

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Publications of the Astronomical Society of Australia
  • ISSN: 1323-3580
  • EISSN: 1448-6083
  • URL: /core/journals/publications-of-the-astronomical-society-of-australia
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