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The Low-Frequency Array (LOFAR): Opening a New Window on the Universe

Published online by Cambridge University Press:  26 May 2016

Namir E. Kassim ,
T. Joseph W. Lazio ,
William C. Erickson ,
Patrick C. Crane ,
R. A. Perley  and
B. Hicks
Namir E. Kassim
Affiliation:
Naval Research Laboratory, Code 7213, Washington, DC 20375—5351 USA
T. Joseph W. Lazio
Affiliation:
Naval Research Laboratory, Code 7213, Washington, DC 20375—5351 USA
William C. Erickson
Affiliation:
Bruny Island Radio Observatory, 42 Lighthouse Rd., Bruny Island, Tasmania 7150 Australia
Patrick C. Crane
Affiliation:
Interferometrics Inc., Chantilly, VA 20151 USA
R. A. Perley
Affiliation:
National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801 USA
B. Hicks
Affiliation:
Naval Research Laboratory, Code 7218, Washington, DC 20375-5351 USA

Abstract

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Decametric wavelength imaging has been largely neglected in the quest for higher angular resolution because ionospheric structure limited interferometric imaging to short (< 5 km) baselines. The long wavelength (LW, 2—20 m or 15—150 MHz) portion of the electromagnetic spectrum thus remains poorly explored. The NRL-NRAO 74 MHz Very Large Array has demonstrated that self-calibration techniques can remove ionospheric distortions over arbitrarily long baselines. This has inspired the Low Frequency Array (LOFAR)—-a fully electronic, broad-band (15—150 MHz)antenna array which will provide an improvement of 2—3 orders of magnitude in resolution and sensitivity over the state of the art.

Type
Part 9: Instrumentation and Techniques
Information
Symposium - International Astronomical Union , Volume 199: The Universe at Low Radio Frequencies , 2002 , pp. 474 - 483
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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