Daily Image
14-02-2011
A sky image from LOFAR station FR606 in Nançay
| Submitter: | Jean-Mathias Griessmeier |
| Description: | Just after the first light of the French LOFAR station FR606 in Nançay 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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