Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21347405m&link_type=abstract
American Astronomical Society, AAS Meeting #213, #474.05; Bulletin of the American Astronomical Society, Vol. 41, p.428
Astronomy and Astrophysics
Astronomy
Scientific paper
The Expanded Very Large Array (EVLA) is a major upgrade of the VLA that is rapidly moving toward completion. The EVLA, when completed in 2012, will offer continuous frequency coverage from 1 to 50 GHz, and a flexible and powerful correlator (WIDAR) comprising 128 independently tunable sub-bands with a minimum of 16384 spectral channels over 8 GHz bandwidth. By the end of 2008, antennas that have been retrofitted to EVLA standards will constitute the majority of the elements in the array. These EVLA antennas already offer wide-band tuning capabilities in the 1-2, 4-8, 18-27 and 40-50 GHz bands. The new 27-40 GHz band is now being outfitted, with 7 antennas expected to be available by early 2009. Here we present some of the recent commissioning results that emphasize the new capabilities obtained using the EVLA at frequencies which were inaccessible or unavailable to the VLA. We also present the status of the WIDAR correlator, which should be available for science observations in 2010, and highlight some of the recent tests carried out using the 4-station prototype WIDAR correlator.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
McKinnon Mark M.
Momjian Emmanuel
Perley Rick
Rupen Michael
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