Daily Image

14-02-2011
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A sky image from LOFAR station FR606 in Nanšay

Submitter: Jean-Mathias Griessmeier
Description: Just after the first light of the French LOFAR station FR606 in Nanšay http://www.astron.nl/dailyimage/main.php?date=20101210),
a full sky observation was performed. The observation was taken at a frequency of 60 MHz, with a bandwidth of only 195.3125 kHz (1 subband). The integration time was 20 seconds.

Even with this limited dataset, three radiosources are clearly visible:
- The supernova remnant Cassiopeia A (lower right). Cas A is one of the brightest radiosources in the sky.
- The bright radiogalaxy Cygnus A (middle).
- The milky way (upper left).

The left panels show the x dipoles, and the right panels the y dipoles.
The upper panels are uncalibrated images, while the lower images show the same data, but after a calibration.

Besides showing that LOFAR station FR606 is working nicely, this is also a good demonstration that a good calibration is essential!
Copyright: J-M. Griessmeier, S. Wijnholds
 
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