1.4 GHz high-resolution flux-accurate images of sn 1006

Abstract

We present interferometric+single-dish images, constructed from the Green Bank Telescope (GBT) and VLA observations, of the supernova remnant SN 1006. The image was created using a Multiscale CLEAN algorithm in conjunction with a novel approach for correcting the effect of the non-coplanar baselines. We demonstrate that integrating with a single dish to the confusion limit of the highest resolution interferometric element is not required. Instead, the noise in the map is limited by the signal-to-noise ratio in each observation. The noise in the combined map at the full resolution is dominated by uncertainties in the VLA data, not by uncertainties in our short GBT observation. The resulting image is a significant improvement over images missing short spacing information, and paves the way for future joint GBT+VLA proposals that need to accurately image objects ranging from galaxies to H II regions. © 2009. The American Astronomical Society. All rights reserved.