Score | Reason |
---|---|
1.00 | The caltable file uid___A002_Xeea188_X1f88.ms.hifa_spwphaseup.s14_3.spw12_14_16_18.solintinf.gpcal.tbl for uid___A002_Xeea188_X1f88.ms was created |
1.00 | For uid___A002_Xeea188_X1f88.ms, field=J1851+0035 (intent=PHASE), SpW=12, the median achieved SNR (57.0) is > 75% of the phase SNR threshold (32.0). This SpW has one or more other SpWs mapped to it. |
1.00 | Excellent stability: The baseline-based median phase RMS for baselines longer than P80 is 14.62deg over the cycle time for uid___A002_Xeea188_X1f88.ms. |
This task computes the spectral window map that will be used to apply the time gaincal phase solutions and the caltable containing per spw phase offsets.
Measurement Set | Field | Intent | Scan IDs | Combine | Spectral Window Map |
---|---|---|---|---|---|
uid___A002_Xeea188_X1f88.ms | J1851+0035 (#2) | PHASE | 6, 15, 24, 33, 42, 51, 60, 70, 77 | True | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 12, 15, 12, 17, 12 |
Measurement Set | Phase SNR threshold | Field | Intent | Spectral Window | Estimated SNR |
---|---|---|---|---|---|
uid___A002_Xeea188_X1f88.ms | 32.0 | J1851+0035 (#2) | PHASE | Combined (12, 14, 16, 18) | 33.5 |
12 | 16.9 | ||||
14 | 18.2 | ||||
16 | 16.9 | ||||
18 | 14.9 |
Measurement Set | Phase Field | TARGET/CHECK Fields |
---|---|---|
uid___A002_Xeea188_X1f88.ms | J1851+0035 (#2) | Serpens_Main_850_00, Serpens_Main_850_01, Serpens_Main_850_02, Serpens_Main_850_03, Serpens_Main_850_08, Serpens_Main_850_09, Serpens_Main_850_10, Serpens_Main_850_11 |
Measurement Set | Solution Parameters | Applied To | Calibration Table | ||
---|---|---|---|---|---|
Type | Interval | Scan Intent | Spectral Windows | ||
uid___A002_Xeea188_X1f88.ms | Phase only | Infinite | ALL | 12, 14, 16, 18 | uid___A002_Xeea188_X1f88.ms.hifa_spwphaseup.s14_3.spw12_14_16_18.solintinf.gpcal.tbl |
The pipeline uses the bandpass phase solutions to create structure functions plots, baseline length versus phase RMS. The measure of the phase RMS over a time interval equal to the phase referencing cycle-time is useful as a proxy for the expected residual phase RMS of a target source after phase referencing. The action of phase referencing itself is to correct phase fluctuations, caused by the atmosphere, on timescales longer than the cycle-time. The median phase RMS reported in the table is for the longest baselines of the array above the >80th percentile projected baseline (labeled "P80"). Previously flagged baseline(s)/antenna(s) are excluded and listed as 'flagged' in the log, while any antenna with noticeably elevated values as identified in this stage will be listed in the table as "Noisier antennas" and marked as 'outlier' in the log. For excellent stability conditions, phase RMS ( < 30 deg), the target images will have minimal decoherence. For stable conditions, phase RMS (30-50 deg), the target image can have slight decoherence which could be improved by self-calibration. When exceeding the phase RMS considered as stable conditions (50-70 deg), target images can suffer from significant decoherence up to 50%. Self-calibration can help improve the final products. In conditions exceeding the poor stability threshold, phase RMS (> 70 deg), target images are expected to be poor, suffer from extreme levels of decoherence and possibly have structure defects. Only self-calibration of known strong targets could recover these data. Self-calibration on bright enough targets may be able to mitigate the degradation caused by phase instability.
If the cycle time is longer than the total length of the bandpass scan, the phase RMS is only reported for the total time.
Measurement Set | Type | Time | Median Phase RMS (deg) | Noisier antennas |
---|---|---|---|---|
uid___A002_Xeea188_X1f88.ms | Total Time | 554.9 | 14.62 | None |
Cycle Time | 585.6 |