Long baseline experiments with LOFAR

Details Long baseline experiments with LOFAR Long baseline experiments with LOFAR

2010-08-25

arxiv.org/abs/1008.4358v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

12 pages with colour figures. Talk presented at the International SKA Forum 2010 (10-14 June 2010, Assen, NL), to appear in Po

Scientific paper

I present first results of LOFAR observations with international baselines. An important cornerstone was the detection of the first long-baseline fringes. Their analysis turns out to be extremely useful to investigate and solve a number of technical issues of the instrument. Crude maps of the sky are created from single-baseline delay/fringe-rate spectra and compared with a short-baseline synthesis map. First long-baseline LBA images are shown of the source 3C196, a bright quasar whose sub-components can only be resolved with the long baselines. The corresponding sub-arcsec HBA image does not show the same amount of details yet, but HBA results are expected to improve significantly very soon. The LBA long-baseline image of 3C196 comprises the highest-resolution radio map ever produced at this low frequency.

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