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Passband/CACAL calibrators

To calibrate the ATCA at narrow bandwidths (using CACAL) and to determine a bandpass, a strong source is needed. CACAL's delay algorithm is not linear with the strength of the source, and so can effectively fail for less strong calibrators. For bandpass calibration, the time required to reach a given solution accuracy goes as the square of the time spent integrating on the source.

Below are some suggested bandpass and CACAL calibrators (together with their flux density at frequencies where they are recommended) for narrowband observations.

Source 20cm 13cm 6cm 3cm 12mm 3mm
0407-658 15.20 Jy 7.57 Jy - - - -
0420-014 - - - 4.25 Jy 9.45 Jy 6.01 Jy
1253-055 - - - - 15.52 Jy 10.91 Jy
1921-293 - - - 5.80 Jy 13.76 Jy 8.25 Jy
1934-638 14.94 Jy 11.14 Jy 5.83 Jy - - -

Original: Bob Sault (21-May-2004)
Modified: Bob Sault (21-May-2004)