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K. K. Dyer (NRL/UNM), T.J. Cornwell (NRAO/ATNF), R.J. Maddelena (NRAO Greenbank)
Since radio interferometers, like the Very Large Array or the Australian Compact Array, act like a high-pass spatial filter, images of large, diffuse sources -- such as most galactic supernova remnants -- contain information about only small scale structures. Historically, researchers have had to choose between single dish measurements, with accurate total flux but low resolution, and interferometric measurements, with much higher resolutions but which might miss 20-80% of the flux. This shortcoming has several serious implications for science. First, optical, x-ray and infrared images have information on all scales, making radio comparisons with other wavelengths problematic. Second, spectral index images between radio frequencies demand specialized and poorly tested methods to overcome differences in spatial sensitivity. Here, we present high resolution 20cm images of supernova remnant SN1006 that combined single-dish measurements, taken by the Green Bank Telescope, with Very Large Array observations. The images contain flux information that is accurate on all relevant spatial scales.
KKD is supported by National Academy of Sciences through a National Research Council Fellowship at the Naval Research Laboratory. Basic Research in Radio Interferometry at the Naval Research Laboratory is supported by the Office of Naval Research. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.