|Description:|| This is an image produced with the LOFAR highband antennas (HBA). An array of 4 tiles was used, augmented with 12 individual dipole elements. The longest baseline is about 500 m. Each tile has 16 dipole elements in a 4x4 array. |
The observing time was 24 hours, and the tile beams were pointed at Cas A. In frequency, 16 subbands were used, between 125 MHz and 175 MHz, each with a bandwidth of 150 kHz.
The two brightest sources Cas A (centre) and Cyg A (right) have been subtracted below 1% level. The brightest remaining source is Tycho, at top left of Cas A. The Sun can be seen at bottom right.
The magenta circle indicates the half-power size of the average tile beam. Indide this circle, more sources can be seen of course.