L-band gain calibrators

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 (%)

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

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

SED link

0.22 +/- 0.01

46.4 +/- 0.4

-0.840 +/- 1.34

3.20 +/- 9.9

0.27