Table 1
Comparison between standard phase referencing, single source self-calibration and MSSC calibration techniques.
| Phase referencing | Single source self-calibration | MSSC | ||||||||||
| Source ID | P (μJy/bm) | I (μJy) | N (μJy/bm) | S / N | P (μJy/bm) | I (μJy) | N (μJy/bm) | S / N | P (μJy/bm) | I (μJy) | N (μJy/bm) | S/N |
|
|
||||||||||||
| 123608+621036 | 41.8 | 50.8 | 6.3 | 6.6 | 45 | 65.6 | 6.3 | 7.1 | 63.5 | 78.8 | 5.6 | 11.4 |
| 123618+621541 | 61 | 75.2 | 9.7 | 6.3 | 63.7 | 75 | 9.9 | 6.4 | 75.3 | 90.0 | 9.7 | 7.8 |
| 123620+620844 | 60 | 60 | 6.9 | 8.7 | 37.6 | 49 | 6.1 | 6.2 | 83.4 (76.5) | 83.4 (82.1) | 9.7 (6.8) | 8.6 (11.3) |
| 123622+620654 | 42.8 | 68.7 | 6.4 | 6.7 | N-D | N-D | 5.91 | - | 40.8 | 56.5 | 5.9 | 6.9 |
| 123624+621643 | 97.1 | 131.3 | 9.7 | 10.0 | 126.9 | 130.6 | 9.9 | 12.8 | 131.3 | 156.8 | 9.8 | 13.4 |
| 123641+621833 | 37.2 | 60.8 | 5.7 | 6.6 | 48.3 | 59.8 | 5.5 | 8.8 | 53.6 | 58.4 | 5.8 | 9.3 |
| 123642+621331 | 88.2 | 101.6 | 5.9 | 14.8 | 85.9 (96.3) | 106.2 (115.5) | 9.7 (6.8) | 8.9 (14.2) | 72.9 (113.2) | 153.1 (141.2) | 9.6 (6.0) | 7.6 (18.9) |
| 123644+621133 | 195 | 197.1 | 9.7 | 20.1 | 155.1 | 168.7 | 9.9 | 15.7 | 262.1 | 256.0 | 9.7 | 27.0 |
| 123646+621405 | 76 | 115.2 | 9.6 | 7.9 | 68.7 | 100.5 | 9.6 | 7.2 | 114.1 | 135.0 | 9.5 | 12.0 |
| 123653+621444 | 45.9 | 53.3 | 5.3 | 8.6 | 49.3 | 56.2 | 5.6 | 8.8 | 58.3 | 62.9 | 5.4 | 10.8 |
| 123659+621833 | 824 | 1348 | 14.7 | 56.1 | 1284 | 1743.9 | 18.1 | 70.9 | 1284.9 | 1732.7 | 11.1 | 115.8 |
| 123700+620910 | 63 | 79.1 | 5.8 | 10.8 | 48.8 | 63.4 | 5.7 | 8.5 | 63.4 (77.4) | 89.2 (91.1) | 9.5 (5.7) | 6.7 (13.6) |
| 123709+620838 | 34.5* | 41.7* | 5.9* | 5.8* | 28.4* | 34.1* | 5.4* | 5.2* | 44.9 | 55.5 | 5.5 | 8.2 |
| 123714+621826 | 170.5 | 181.2 | 10.0 | 17.1 | 185.1 | 216.2 | 10.4 | 17.8 | 235.1 | 252.5 | 10.1 | 23.3 |
| 123715+620823 | 840.8 | 946.8 | 13.5 | 62.3 | 524.4 | 701 | 14.6 | 35.9 | 1242.6 | 1300.6 | 15.6 | 79.7 |
| 123716+621512 | 50.1 | 54.3 | 5.6 | 8.9 | 49.6 | 59.5 | 6.1 | 8.2 | 59.4 | 75.1 | 5.9 | 10.1 |
| 123717+621733 | 68.3 | 76.2 | 9.7 | 7.0 | 71.8 | 102.8 | 9.7 | 7.4 | 86.3 | 99.3 | 9.6 | 9.0 |
| 123721+621130 | 110.7 | 153 | 9.9 | 11.1 | 112 | 143.9 | 9.8 | 11.5 | 182.0 | 195.1 | 9.9 | 18.5 |
| 123726+621128 | 49 | 63.7 | 5.6 | 8.8 | N-D | N-D | 6.43 | - | 57.3 | 66.5 | 5.6 | 10.2 |
| 123701+622109 | 55.6 | 80.4 | 5.6 | 10.0 | 57.7 | 73.1 | 5.7 | 10.1 | 64.0 | 77.8 | 5.6 | 11.4 |
| Phase referencing | SSSC | MSSC | |
|
|
|||
| Detected with natural weighting | 19 | 17 | 20 |
| Detected with uniform weighting | 9 | 10 | 12 |
| Failed solutions (iteration 3) | – | 7% | 2% |
Notes. Top panel: comparison of the peak flux density per beam or brightness (P) in μJy/beam (shortened to μJy/bm), integrated flux density (I), in μJy, rms noise (R), in μJy/beam, and the S/N of the peak brightness to the rms noise for three different calibration methods. The peak flux densities and integrated flux densities were determined using the AIPS task JMFIT and the noise was measured using the AIPS task IMSTAT. The phase referencing uses only the two designated calibrators J1241+602 and J1234+619. Single source self-calibration has an additional calibration step. Only the brightest detected source (J123659+621833) is used for self-calibration with a solution interval of 6 min and MSSC uses 9 sources in MSSC. All entries correspond to values with calibrated weights, apart from entries in bold which are detections with natural weighting. The * represents sources which did not reach the detection threshold of 6σ but their flux densities could be measured, whereas N-D (non-detection) indicates sources that did not reach the detection threshold and their flux densities could not be measured. Bottom panel: a summary of the total number sources that reached the 6σ detection threshold with each calibration technique along with the percentage of failed solutions during the last iteration of self-calibration.
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