Daily Image
21-12-2006
Radio-seeing at the GMRT?
| Submitter: | Amitesh Omar |
| Description: | This movie is an 8-hour succession of 1 minute snapshots of the bright source 3c48, taken with the 21 km GMRT (India) at an observing frequency of 150 MHz. The point-source is surrounded by a slowly rotating "point-spread-function", which is caused by the configuration of antennas in the GMRT array. The large-scale variations in the ionosphere cause the source to move by a few arcminutes. The streaming stuff in the background is not yet fully understood, but is probably caused by the small-scale structure of the ionosphere. The study of observations like these is very important for the development of the calibration software for LOFAR. (NB: Jan Noordam will award a bottle of wine to the pundit who satisfactorily explains the streaming phenomenon in 2006) |
| Copyright: | Amitesh Omar |
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