Hostname: page-component-586b7cd67f-dsjbd Total loading time: 0 Render date: 2024-11-26T20:14:22.451Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Barger, A. J. & et al. 1998, Nature, 394, 248 CrossRefGoogle Scholar
Blundell, K. M., Rawlings, S., Eales, S. A., Taylor, G. B., & Bradley, A. D. 1998, Mon. Not. R. Astron. Soc., 295, 265 Google Scholar
Bowyer, S. & Berghöfer, T. W. 1998, Astrophys. J., 506, 502, astro-ph/9804310 Google Scholar
Carilli, C. L. & Yun, M. S. 1999, Astrophys. J., 513, L13 Google Scholar
Cordes, J. M. 1990, in Low Frequency Astrophysics from Space, ed. Kassim, N. E. & Weiler, K. W., Lecture Notes in Physics No. 362 (Berlin: Springer-Verlag), 165–174 Google Scholar
Dulk, G. A., Leblanc, Y., & Bastian, T. S. 1997, in Bull. Am. Astron. Soc., DPS meeting 29 No. 28.03 (American Astronomical Society)Google Scholar
Enßlin, T. A. & Biermann, P. L. 1998, Astron. & Astrophys., 330, 90 Google Scholar
Farrell, W. M., Desch, M. D., & Zarka, P. 1999, J. Geophys. Res. (Planets), 104, 14025 Google Scholar
Hewish, A., Bell, S. J. H., Pilkington, J. D. H., Scott, P. F., & Collins, R. A. 1968, Nature, 217, 709 Google Scholar
Hughes, D. H. & et al. 1998, Nature, 394, 241 Google Scholar
Hwang, C.-Y. 1997, Science, 278, 1917 Google Scholar
Kassim, N. E. & Erickson, W. C. 1998, in Advanced Technology MMW, Radio, and Terahertz Telescopes, Vol. 3357 (SPIE), 740–754 Google Scholar
Kassim, N. E., Perley, R. A., Erickson, W. C., & Dwarakanath, K. S. 1993, Astron. J., 106, 2218 CrossRefGoogle Scholar
Kellermann, K. & Sheets, B., eds. 1983, Serendipitous Discoveries in Radio Astronomy, Green Bank Workshop No. 7 (National Radio Astronomy Observatory)Google Scholar
Kronberg, P. P. 1999, private communication Google Scholar
Longair, M. S. 1990, in Low Frequency Astrophysics from Space, ed. Kassim, N. E. & Weiler, K. W., Lecture Notes in Physics No. 362 (Berlin: Springer-Verlag), 227–236 Google Scholar
Madau, P. 1997, in International Astronomical Union Symposium, Vol. 186, Galaxy Interactions at Low and High Redshift, ed. Sanders, D. & Barnes, J. (Dordrecht: Kluwer), 188 Google Scholar
Mahoney, M. J. & Erickson, W. C. 1985, Nature, 317, 154 Google Scholar
Navarro, J., de Bruyn, A. G., Frail, D. A., Kulkarni, S. R., & Lyne, A. G. 1995, Astrophys. J., 455, L55 CrossRefGoogle Scholar
Sarazin, C. L. 1999, Astrophys. J., 520, 529, astro-ph/9901061 Google Scholar
Sarazin, C. L. & Lieu, R. 1998, Astrophys. J., 494, L177 Google Scholar
Schaefer, B. E., King, J. R., Deliyannis, C. P., & Rubenstein, E. P. 1998, in Bull. Am. Astron. Soc., Vol. 193 (American Astronomical Society)Google Scholar
Schlickeiser, R., Sievers, A., & Thiemann, H. 1987, Astron. & Astrophys., 182, 21 Google Scholar
Smail, I., Ivison, R. J., & Blain, A. W. 1997, Astrophys. J., 490, L5 Google Scholar
Zhao, J.-H. & et al. 1992, Science, 255, 1538 CrossRefGoogle Scholar