The Low Frequency Array (LOFAR): opening a new window on the universe

Details The Low Frequency Array (LOFAR): opening a new window on the universe The Low Frequency Array (LOFAR): opening a new window on the universe

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....6752k&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #6752

Astronomy and Astrophysics

Astronomy

Scientific paper

Application of self-calibration techniques to low-frequency radio interferometric data has enabled high-resolution, high sensitivity imaging at long wavelengths for the first time. We illustrate these advances using Very Large Array (VLA) 74 MHz images having sub-arcminute resolution and sub-Jansky sensitivity. The VLA 74 MHz breakthrough has inspired the Low Frequency Array (LOFAR), a completely electronic array planned to operate in the 10-240 MHz frequency range (http://www.lofar.org). It will have a square kilometer of collecting area at 15 MHz, milliJansky sensitivity, and arcsecond resolution. LOFAR will surpass, by 2-3 orders of magnitude, the power of previous interferometers in its frequency range, and thus open a new window on the electromagnetic spectrum. We describe LOFAR and present recent results from its design-and-development phase. LOFAR's scientific objectives include (1) Planetary and solar radio emission; (2) Acceleration, Turbulence, and Propagation in the interstellar medium including 3D mapping of the Galactic cosmic rays; and (3) The extragalactic universe, including high-redshift radio galaxies, galaxy clusters, and possibly the first structures to form near the epoch of reionization. LOFAR may also serve as the receiving instrument for imaging bi-static solar radar experiments. Because LOFAR will open a new window on the spectrum, discovering new classes of sources or physical phenomena is also likely. LOFAR is an international project being developed by the Naval Research Laboratory (US), ASTRON (NL), and MIT (US). Basic research in radio astronomy at the Naval Research Laboratory is supported by the Office of Naval Research.

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