Computer Science – Performance
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21942234k&link_type=abstract
American Astronomical Society, AAS Meeting #219, #422.34
Computer Science
Performance
Scientific paper
We present a description and update of the Expanded Very Large Array (EVLA) Low Band project, an initiative to equip the National Radio Astronomy Observatory (NRAO) EVLA (http://www.aoc.nrao.edu/evla/) with broadband low frequency receivers which cover the spectrum between 50 and 436 MHz. The EVLA system will initially access the 68 to 86 MHz and 230 to 436 MHz sub-bands by working with the existing 74 and 330 MHz feeds, respectively. The bandwidth at 74 MHz will increase by more than an order of magnitude while the 330 MHz bandwidth increases by approximately a factor of 6. The improved bandwidth and system temperature, coupled with the power of the EVLA WIDAR correlator, will significantly enhance the performance in both bands compared to past VLA capabilities.
We also present an update on commissioning of the first station of the Long Wavelength Array (LWA: http://lwa.unm.edu), a new digitally steerable radio telescope designed to operate from 10 to 88 MHz. The full LWA instrument will consist of over 50 phased array "stations” which are distributed over a roughly 400 km region in the state of New Mexico. Each station will consist of 256 pairs of dipole-based antennas. The signals can be formed into 4 beams with separate frequency and sky pointings. The output beams are transported to a central location for high-resolution aperture synthesis imaging with mJy sensitivities and arcsecond resolution. We will show early examples of observations with the first complete LWA station, called LWA1, located near the core of the EVLA. The potential to combine low frequency signals from early LWA stations with the new EVLA Low Band system is also being explored.
Clarke Tracy E.
Durand Stephane
Harden P.
Hicks B. C.
Kassim Namir E.
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