Daily Image
23-05-2006
Krakelingen
| Submitter: | Sarod Yatawatta |
| Description: | The Westerbork High-band Antenna Test-station (WHAT) for LOFAR is located near RT8 of the WSRT. The above image shows the visibility amplitudes of the 14 interferometers between WHAT and the 14 WSRT telescopes. Each baseline has 4 correlations XX, XY, YX, and YY shown in different colours. Their response is maximum when the angles between WHAT and WSRT dipoles are zero. The angles change because of the differences in construction: the WHAT dipoles are fixed and horizontal. The source observed was the Crab Nebula which is resolved and produces a peak correlation coefficient of about 3%. The observing frequency was 173MHz with a bandwidth of only 10kHz. Note the rapid fringing on the shortest (RT8-WHAT) baseline, which is due to highly extended Galactic plane emission. |
| Copyright: | The WHAT X Team |
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