Polarisation calibrators
The table below lists the two primary polarisation calibrators, J1331+3030 and J0521+1638 (3C 286 and 3C 138, respectively), along with another batch of possible L-band polarisation calibrators (Taylor & Legodi 2021) that are found to be significantly polarised over the wide-band with low rotation measures (RM <~ 10) at L-band. These calibrators are also on the list of MeerKAT L-band gain calibrators while some (indicated with UHF measurements given in the table) also form part of the UHF list of gain calibrators.
Calibrator name | RAJ2000 | DecJ2000 | S1.4GHz (Jy) | alphaL-band | SED plot | p1.4GHz (%) | PA1.4GHz (deg) | med(vL) (%) | p816MHz (%) | med(vUHF) (%) | RML (rad/m2) |
J1331+3030 | 13:31:08 | 30:30:33 | 14.259 +/- 0.174 | -0.538 +/- 0.02 | 9.30 +/- 0.02 | 33.1 +/- 0.1 | 0.018 +/- 0.008 | 4.11 +/- 0.18 | 0.187 +/- 0.082 | 0.00 +/- 0.2 | |
J0521+1638 | 05:21:10 | 16:38:22.052 | 8.332 +/- 0.187 | -0.636 +/- 0.01 | 7.71 +/- 0.05 | -8.2 +/- 0.2 | 0.052 +/- 0.007 | 2.69 +/- 0.21 | -1.449 +/- 0.171 | -0.80 +/- 0.3 | |
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J0059+0006 | 00:59:06 | 00:06:52 | 2.449 +/- 0.055 | -0.559 +/- 0.01 | 3.76 +/- 0.05 | 74.3 +/- 0.6 | -0.098 +/- 0.005 | 1.44 +/- 0.10 | 0.608 +/- 0.074 | -3.60 +/- 0.8 | |
J0108+0134 | 01:08:39 | 01:35:00 | 3.113 +/- 0.070 | -0.273 +/- 0.02 | 3.88 +/- 0.01 | -79.7 +/- 0.2 | -0.033 +/- 0.007 | -- | -- | -6.60 +/- 0.5 | |
J1051-2023 | 10:51:32 | -20:23:47 | 1.442 +/- 0.032 | -1.075 +/- 0.01 | 2.30 +/- 0.01 | 66.7 +/- 0.1 | -0.041 +/- 0.003 | 0.35 +/- 0.17 | 0.314 +/- 0.036 | -4.00 +/- 1.2 | |
J1239-1023 | 12:39:43 | -10:23:29 | 1.554 +/- 0.019 | -0.068 +/- 0.03 | 2.51 +/- 0.01 | 78.8 +/- 0.2 | 0.102 +/- 0.003 | 2.77 +/- 0.04 | 0.752 +/- 0.054 | 2.40 +/- 1.1 | |
J1424-4913 | 14:24:32 | -49:13:50 | 8.131 +/- 0.099 | -0.382 +/- 0.02 | 1.84 +/- 0.01 | -4.4 +/- 0.2 | -0.010 +/- 0.001 | -- | -- | 10.80 +/- 1.5 | |
J1512-0906 | 15:12:51 | -9:06:00 | 2.442 +/- 0.030 | -0.034 +/- 0.03 | 3.24 +/- 0.01 | 42.0 +/- 0.1 | 0.051 +/- 0.001 | -- | -- | -10.40 +/- 0.7 | |
J1517-2422 | 15:17:42 | -24:22:19 | 3.026 +/- 0.037 | -0.009 +/- 0.02 | 3.35 +/- 0.01 | 41.0 +/- 0.2 | -0.006 +/- 0.003 | 4.82 +/- 0.44 | 0.336 +/- 0.148 | -5.40 +/- 0.5 | |
J1550+0527 | 15:50:35 | 05:27:10 | 2.864 +/- 0.035 | -0.162 +/- 0.02 | 1.77 +/- 0.01 | 78.1 +/- 0.2 | -0.042 +/- 0.001 | 1.48 +/- 0.34 | -0.227 +/- 0.095 | -6.40 +/- 1.6 | |
J1923-2104 | 19:23:32 | -21:04:33 | 1.215 +/- 0.015 | -0.179 +/- 0.03 | 2.93 +/- 0.01 | -33.1 +/- 0.2 | 0.060 +/- 0.002 | -- | -- | 9.80 +/- 0.8 | |
J2131-1207 | 21:31:01 | -12:07:05 | 1.970 +/- 0.024 | 0.110 +/- 0.03 | 1.75 +/- 0.01 | -44.1 +/- 0.1 | -0.109 +/- 0.002 | -- | -- | 6.80 +/- 0.9 |