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. The set of potential polarisation calibrators is being monitored and vetted for suitability as polarisation calibrators at L-band.

 

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

SED link

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

SED link

7.71 +/- 0.05

-8.2 +/- 0.2

0.052 +/- 0.007

2.69 +/- 0.21

-1.449 +/- 0.171

-0.80 +/- 0.3

 

 

 

 

 

 

 

 

 

 

 

 

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

-0.098 +/- 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

SED link

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

SED link

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

SED link

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

SED link

1.84 +/- 0.01

-4.4 +/- 0.2

-0.010 +/- 0.001

--

--

10.80 +/- 1.5

J1512-0906

15:12:51

-09:06:00

2.442 +/- 0.030

-0.034 +/- 0.03

SED link

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

SED link

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

SED link

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

SED link

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

SED link

1.75 +/- 0.01

-44.1 +/- 0.1

-0.109 +/- 0.002

--

--

6.80 +/- 0.9