Computer Science – Performance
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...21113308w&link_type=abstract
American Astronomical Society, AAS Meeting #211, #133.08
Computer Science
Performance
Scientific paper
Continuous frequency coverage is an important scientific and technical goal of the Square Kilometer Array (SKA). We investigate one avenue of reaching this goal with data taken from the high-resolution, broadband correlator of the Allen Telescope Array (ATA). With a total frequency coverage of 0.5 to 11.2 GHz and 1024 channels in a spectral window 100 MHz wide, the ATA is an ideal exploratory instrument for this kind of science. We present observations of calibrators taken over a broad swath of the ATA's frequency range and show how the well-known spectral indices of these sources can be recovered. With this consistency check in hand, a few sample broadband spectra and images of more scientifically interesting targets are presented. Our experiments explore the continuous frequency performance of the ATA antennas, feeds, and receivers and also identify the limitations that radio frequency interference place on our ability to make images. Further observations of this kind at the ATA will yield not only intriguing standalone science results but also valuable knowledge about the developments needed to endow the SKA with a robust continuous frequency capability.
Bower Geoffrey C.
Williams Peter K. G.
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