LBA Fringe Finders

The three best sources to use for fringe finders are 1921-293, 0537-441 and 3C273. 0208-512 may also be used during the brief period when none of those 3 are visible. At 22 GHz, 3C279 is the preferred source if available. At Parkes these sources are above the elevation limits for the following LST ranges.

 

Source LST rise LST set
1921-293 14:40 00:10
0537-441 00:25 10:52
3C273 09:00 15:55
0208-512 19:10 08:45
3C279 08:00 17:54

For a standard array comprising telescopes in Australia and New Zealand, you should choose a fringe finder at any given LST from this uptime plot.

Parkes and Hartebeesthoek have very limited mutual visibility, so for an array including Hartebeesthoek and ATCA, but omitting Parkes, the fringe finder for any given LST may be chosen from this uptime plot.

 

Below is a list of potential fringe finders to use with LBA observations. Flux densities are the "unresolved" fluxes from Leonid Petrov's catalogue. Please note these may not be accurate for some sources, and all listed sources are likely to vary.

Source RA Dec S (18cm) S (4cm) S (1.4 cm)
J0106-4034 01:06:45.107977 -40:34:19.96019 1.0 2.5 0.7
0208-512 02:10:46.200412 -51:01:01.89187 1.4 1.0  
J0334-4008 03:34:13.654492 -40:08:25.39786 0.7 1.2  
J0423-0120 04:23:15.800725 -01:20:33.06555 2.0 2.2 4.5
0537-441 05:38:50.361540 -44:05:08.93895 2.5 2.4 1.5
J0609-1542 06:09:40.949540 -15:42:40.67266 1.8 2.2 1.2
0834-201 08:36:39.215246 -20:16:59.50413 1.0 1.2 0.7
J1147-3812 11:47:01.370702 -38:12:11.02351 1.0 1.5 0.7
3C273 12:29:06.699731 +02:03:08.59808 2.3 2.6 3.5
3C279 12:56:11.166558 -05:47:21.52508 2.8 8.8 9.0
J1337-1257 13:37:39.782778 -12:57:24.69338 1.9 3.2 3.1
J1625-2527 16:25:46.891639 -25:27:38.32688 1.0 1.4 0.9
J1733-1304 17:33:02.705787 -13:04:49.54828 1.7 3.5 2.2
J1743-0350 17:43:58.856136 -03:50:04.61673 2.7 2.6 1.7
1921-293 19:24:51.055957 -29:14:30.12104 4.1 6.6 3.7
J2225-0457 22:25:47.259297 -04:57:01.39075 1.5 2.3 2.0
J2258-2758 22:58:05.962887 -27:58:21.25671 0.8 2.8 2.1

 

 

 

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