L-band gain calibrators
We present below updated, full Stokes, measurements of the MeerKAT L-band gain/phase calibrators. Observations were conducted in August 2019 (RA range 11–23 hours) and August 2020 (RA range 00-11 hours). Full imaging products are available as a data release in the SARAO repository.
Data products are full Stokes parameter (Stokes I, Q, U, and V) fits image cubes, total intensity spectra (PNG files) and other polarisation spectral plots (PNG files). These images are provided for each calibrator source reported on in the memo and article above.
The table below lists the following properties for each calibration source:
The flux density at 1400 MHz (S1.4GHz), from a power-law fit to the Stokes I spectrum.
The in-band spectral index from the power-law fit to the Stokes I spectrum (Alpha). The errors presented are the formal errors on the fit parameter from the covariance matrix.
A URL link to the peak Stokes I spectrum plot (SED plot), where flux values shown are taken from the brightest pixel in the FITS cube along the frequency axis.
The degree of polarised intensity and position angle (EVPA) at 1400 MHz (p1.4GHz, PA1.4GHz) – measured as the average value of polarised intensity and polarisation angle over the channels within +/- 20 MHz of 1400 MHz. The errors are the standard error on the mean derived from the RMS of the N values over the frequency interval divided by square-root(N).
The spectral index of polarised intensity (Beta) from a power-law fit to the spectrum of polarised intensity. Errors are the formal errors on the fit parameter from the covariance matrix.
The Faraday depth (RM) of the dominant RM synthesis component with associated error.
The amplitude (pmax – polarised intensity) of the dominant RM synthesis component.
The median value of the fractional Stokes v=V/I over the band (med. v). The error is the standard error on the mean derived from the RMS of the values over the band.
Calibrator name | RA (J2000) | DEC (J2000) | S1.4GHz (Jy) | Alpha | SED plot | p1.4GHz (%) | PA1.4GHz(deg) | Beta | RM (rad/m^2) | pmax (%) | med. v (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|
J0010-4153 | 00:10:53 | -41:53:11 | 4.545 +/- 0.102 | -0.851 +/- 0.02 | 0.12 +/- 0.00 | -60.2 +/- 0.7 | -0.240 +/- 1.26 | -1.20 +/- 18.7 | 0.14 | 0.008 +/- 0.002 | |
J0022+0014 | 00:22:25 | +00:14:56 | 2.900 +/- 0.065 | -0.563 +/- 0.02 | 0.09 +/- 0.01 | -11.3 +/- 1.6 | -1.530 +/- 1.66 | 2.00 +/- 13.1 | 0.13 | -0.080 +/- 0.003 | |
J0024-4202 | 00:24:43 | -42:02:04 | 2.871 +/- 0.065 | 0.639 +/- 0.06 | 0.10 +/- 0.01 | -4.1 +/- 1.1 | -0.360 +/- 1.42 | 4.60 +/- 13.2 | 0.13 | -0.052 +/- 0.003 | |
J0025-2602 | 00:25:49 | -26:02:13 | 8.731 +/- 0.196 | -0.733 +/- 0.01 | 0.17 +/- 0.00 | 72.8 +/- 1.1 | 0.310 +/- 0.94 | -3.60 +/- 12.8 | 0.18 | -0.077 +/- 0.004 | |
J0059+0006 | 00:59:06 | +00:06:52 | 2.449 +/- 0.055 | -0.559 +/- 0.01 | 3.76 +/- 0.05 | 74.3 +/- 0.6 | -0.680 +/- 0.23 | -3.60 +/- 0.8 | 3.1 | -0.098 +/- 0.005 | |
J0108+0134 | 01:08:39 | +01:35:00 | 3.113 +/- 0.070 | -0.273 +/- 0.02 | 3.88 +/- 0.01 | -79.7 +/- 0.2 | 0.130 +/- 0.06 | -6.60 +/- 0.5 | 3.87 | -0.033 +/- 0.007 | |
J0137+3309 | 01:37:41 | +33:09:35 | 16.112 +/- 0.362 | -0.889 +/- 0.01 | 0.64 +/- 0.01 | -36.4 +/- 0.5 | -2.010 +/- 1.17 | -55.40 +/- 4.6 | 0.49 | -0.025 +/- 0.003 | |
J0155-4048 | 01:55:37 | -40:48:42 | 2.161 +/- 0.049 | -0.456 +/- 0.01 | 0.07 +/- 0.01 | 29.9 +/- 2.2 | 1.710 +/- 0.90 | 0.00 +/- 30.5 | 0.08 | -0.006 +/- 0.002 | |
J0203-4349 | 02:03:41 | -43:49:51 | 2.726 +/- 0.061 | -0.825 +/- 0.01 | 0.91 +/- 0.01 | -55.5 +/- 0.3 | -7.370 +/- 0.97 | -8.20 +/- 4.8 | 0.49 | -0.018 +/- 0.002 | |
J0210-5101 | 02:10:46 | -51:01:02 | 3.402 +/- 0.077 | 0.127 +/- 0.02 | 1.24 +/- 0.01 | 30.7 +/- 0.2 | -0.310 +/- 0.16 | 14.60 +/- 2.5 | 1.12 | -0.031 +/- 0.003 | |
J0238+1636 | 02:38:39 | +16:36:59 | 0.528 +/- 0.014 | -0.246 +/- 0.05 | 0.77 +/- 0.01 | 19.6 +/- 23.7 | 0.200 +/- 0.71 | 48.00 +/- 2.7 | 0.72 | -0.075 +/- 0.007 | |
J0240-2309 | 02:40:08 | -23:09:16 | 5.938 +/- 0.134 | -0.154 +/- 0.03 | 0.98 +/- 0.00 | -42.2 +/- 0.2 | -0.220 +/- 0.33 | 10.00 +/- 3.0 | 0.98 | 0.359 +/- 0.006 | |
J0252-7104 | 02:52:46 | -71:04:35 | 5.811 +/- 0.131 | -0.972 +/- 0.01 | 0.18 +/- 0.01 | -35.3 +/- 0.2 | 0.010 +/- 0.72 | 2.40 +/- 12.2 | 0.23 | 0.002 +/- 0.001 | |
J0303-6211 | 03:03:51 | -62:11:26 | 3.194 +/- 0.072 | -0.093 +/- 0.01 | 4.71 +/- 0.01 | 46.6 +/- 0.5 | -0.340 +/- 0.07 | 49.60 +/- 1.2 | 4.43 | -0.057 +/- 0.005 | |
J0318+1628 | 03:18:58 | +16:28:33 | 7.619 +/- 0.171 | -0.529 +/- 0.02 | 0.03 +/- 0.01 | -19.9 +/- 8.5 | -2.220 +/- 2.41 | 5.20 +/- 44.2 | 0.05 | 0.004 +/- 0.003 | |
J0323+0534 | 03:23:20 | +05:34:12 | 2.766 +/- 0.062 | -0.920 +/- 0.01 | 0.26 +/- 0.01 | -71.6 +/- 0.3 | 0.590 +/- 0.88 | 2.40 +/- 8.0 | 0.33 | -0.021 +/- 0.003 | |
J0329+2756 | 03:29:58 | +27:56:15 | 1.395 +/- 0.031 | -0.336 +/- 0.02 | 0.16 +/- 0.01 | -3.7 +/- 1.1 | -0.810 +/- 0.97 | 2.40 +/- 7.7 | 0.21 | -0.166 +/- 0.003 | |
J0403+2600 | 04:03:06 | +26:00:02 | 1.289 +/- 0.029 | 0.037 +/- 0.02 | 3.05 +/- 0.01 | 75.3 +/- 0.6 | -1.190 +/- 0.10 | 49.80 +/- 1.3 | 2.62 | 0.110 +/- 0.007 | |
J0405-1308 | 04:05:34 | -13:08:14 | 3.945 +/- 0.089 | -0.533 +/- 0.02 | 1.14 +/- 0.01 | 31.4 +/- 0.3 | 0.460 +/- 0.29 | 19.60 +/- 2.6 | 1.18 | -0.012 +/- 0.002 | |
J0408-6545 | 04:08:20 | -65:45:09 | 15.198 +/- 0.342 | -1.201 +/- 0.00 | 0.01 +/- 0.00 | -65.1 +/- 0.8 | 1.050 +/- 0.69 | 1.20 +/- 146.3 | 0.02 | 0.003 +/- 0.000 | |
J0409-1757 | 04:09:07 | -17:57:10 | 2.205 +/- 0.050 | -0.855 +/- 0.01 | 0.15 +/- 0.01 | -35.3 +/- 1.0 | 0.630 +/- 0.72 | 5.20 +/- 14.0 | 0.2 | -0.018 +/- 0.002 | |
J0420-6223 | 04:20:56 | -62:23:39 | 3.327 +/- 0.075 | -1.050 +/- 0.01 | 0.12 +/- 0.01 | 65.7 +/- 0.4 | 0.000 +/- 0.71 | 2.60 +/- 14.8 | 0.16 | -0.009 +/- 0.001 | |
J0423-0120 | 04:23:16 | -01:20:33 | 1.195 +/- 0.027 | -0.088 +/- 0.04 | 4.07 +/- 0.01 | 39.0 +/- 0.2 | 0.060 +/- 0.10 | -20.60 +/- 1.2 | 3.98 | 0.011 +/- 0.007 | |
J0440-4333 | 04:40:17 | -43:33:09 | 3.593 +/- 0.081 | -0.763 +/- 0.01 | 0.60 +/- 0.01 | -76.6 +/- 0.2 | -0.480 +/- 0.16 | 8.40 +/- 3.8 | 0.57 | -0.047 +/- 0.001 | |
J0447-2203 | 04:47:37 | -22:03:37 | 2.025 +/- 0.046 | -1.029 +/- 0.01 | 0.23 +/- 0.01 | -24.6 +/- 0.5 | -0.130 +/- 0.69 | 2.00 +/- 8.6 | 0.28 | -0.007 +/- 0.003 | |
J0453-2807 | 04:53:15 | -28:07:37 | 2.193 +/- 0.049 | -0.342 +/- 0.01 | 0.59 +/- 0.04 | 17.0 +/- 1.5 | 2.830 +/- 1.82 | 19.60 +/- 2.0 | 1.73 | 0.002 +/- 0.004 | |
J0503+0203 | 05:03:21 | +02:03:05 | 2.218 +/- 0.050 | 0.249 +/- 0.03 | 0.04 +/- 0.00 | 41.6 +/- 1.7 | 1.520 +/- 0.98 | 1.60 +/- 46.8 | 0.06 | 0.042 +/- 0.003 | |
J0521+1638 | 05:21:10 | +16:38:22 | 8.332 +/- 0.187 | -0.636 +/- 0.01 | 7.71 +/- 0.05 | -8.2 +/- 0.2 | -0.830 +/- 0.05 | -0.80 +/- 0.3 | 7.03 | 0.052 +/- 0.007 | |
J0534+1927 | 05:34:45 | +19:27:21 | 6.741 +/- 0.152 | -0.856 +/- 0.01 | 0.02 +/- 0.01 | -4.0 +/- 10.7 | -2.060 +/- 2.04 | 6.40 +/- 48.5 | 0.05 | -0.023 +/- 0.002 | |
J0538-4405 | 05:38:50 | -44:05:09 | 2.156 +/- 0.049 | -0.336 +/- 0.03 | 0.07 +/- 0.00 | 70.8 +/- 1.0 | 3.250 +/- 0.99 | 48.80 +/- 17.7 | 0.17 | -0.030 +/- 0.001 | |
J0609-1542 | 06:09:41 | -15:42:41 | 1.674 +/- 0.038 | -0.562 +/- 0.04 | 2.28 +/- 0.01 | 9.2 +/- 0.9 | 0.050 +/- 0.23 | 68.40 +/- 1.3 | 2.45 | -0.126 +/- 0.004 | |
J0616-3456 | 06:16:36 | -34:56:17 | 2.904 +/- 0.065 | -0.583 +/- 0.01 | 0.13 +/- 0.01 | -54.1 +/- 17.3 | 0.220 +/- 0.62 | 1.40 +/- 10.3 | 0.16 | -0.017 +/- 0.001 | |
J0632+1022 | 06:32:15 | +10:22:02 | 2.427 +/- 0.055 | -0.435 +/- 0.03 | 0.24 +/- 0.01 | 37.0 +/- 0.9 | -0.060 +/- 0.70 | 2.60 +/- 10.3 | 0.27 | -0.021 +/- 0.002 | |
J0725-0054 | 07:25:51 | -00:54:57 | 11.733 +/- 0.264 | 0.333 +/- 0.03 | 2.52 +/- 0.01 | -13.2 +/- 0.6 | -0.430 +/- 0.10 | 48.80 +/- 1.4 | 2.39 | -0.206 +/- 0.004 | |
J0730-1141 | 07:30:19 | -11:41:13 | 2.260 +/- 0.051 | 0.473 +/- 0.04 | 0.98 +/- 0.01 | -72.9 +/- 1.7 | 1.270 +/- 0.73 | 108.00 +/- 1.7 | 1.49 | -0.095 +/- 0.002 | |
J0735-1735 | 07:35:46 | -17:35:49 | 2.600 +/- 0.059 | -0.173 +/- 0.01 | 0.06 +/- 0.00 | 50.0 +/- 2.2 | -1.410 +/- 1.39 | 0.00 +/- 38.9 | 0.07 | -0.115 +/- 0.002 | |
J0739+0137 | 07:39:18 | +01:37:05 | 1.021 +/- 0.023 | 0.133 +/- 0.03 | 5.24 +/- 0.02 | -81.9 +/- 0.4 | 0.790 +/- 0.06 | 27.60 +/- 1.3 | 5.81 | 0.094 +/- 0.006 | |
J0745+1011 | 07:45:33 | +10:11:13 | 3.225 +/- 0.073 | 0.518 +/- 0.04 | 0.22 +/- 0.01 | 46.4 +/- 0.4 | -0.840 +/- 1.34 | 3.20 +/- 9.9 | 0.27 |