| VS06z Results
Submitted checklist.txt and checklist.tex is also available |
[Summary | AIPS | Difmap ] |
| Observation code | : | VS06z | AIPS Version | : | 31DEC00 |
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| Date of Observation | : | 1998/319 | Difmap Version | : | 2.4a | |||
| Source Name | : | J0149+0555 | vsop_difmap used | : | No | |||
| Calibration Source(s) | : | 0119+115 | ||||||
| Ground telescopes | : | GB, ARECIBO, HART, NOTO | Model Fitted to data | : | Yes | |||
| Tracking Station(s) | : | None | Image made | : | No | |||
| Correlator | : | Penticton |
| Abstract
Experiment correlated in Dec-1998, so requires the x 0.906 correction with CLCOR. Experiment also requires a sqrt(2) correction due to correlation coefficient scaling factor error. So total required correction is 0.906 x sqrt(sqrt(2)) = 1.0774 PI Letter says: "Fringes were detected everywhere except with the HH telescope. Jonathan Quick advised that HH be abandoned due to wrong sampling. We attempted correlating with quantization = 2 but still found no finges.". As a result, no attempt was made to find fringes to Hart Large amplitude correction required for IF2 at Noto. Improves things but not entirely |
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| FITLD | clint = 0.25 digicor = -1 delcorr = -1 |
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| MSORT |
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| INDXR | infile=INDXR.TXT cparm 0,0,0.25 |
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| ANTAB | infile=ANTAB.TXT |
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| APCAL |
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TY = GC = 1 | |
| CLCAL | refant=2, interpol=self |
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NARAO 140ft is ref ant. |
| TACOP |
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copy CL table before CLCOR | |
| CLCOR | antennas 0 opcode 'gain' clcorprm 1.0774,0 |
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apply amplitude correction factor |
| uvflg | antennas 3,0 opcode 'flag' dohist 1 |
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Flag all Hart baselines |
| FRING | docalib 1 gainuse 3 refant 2 solint 5 dparm 0,3000,100,1,0 aparm 2,0,0,0,0,1,0.1,0 timerang 0 |
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Initial fringe fit. Used DQA to set search windows. Looks good |
| CLCAL | interpol 'ambg' refant 2 |
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| SPLIT | aparm = 2,0 |
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no valid data on 2251+158 |
| FITTP |
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| TACOP |
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copy CL table before CLCOR | |
| CLCOR | antennas 4,0 opcode 'gain' clcorprm 1.6279,0 bif 2 eif 2 |
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apply amplitude correction factor for IF2 at Noto. |
| SPLIT | aparm = 2,0 |
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no valid data on 2251+158 |
| FITTP |
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AIPS Input Files
| ANTAB.TXT | Comments NRAO 140 gain from George Moellenbrock (an estimate, probably good to 10%) ARECIBO SEFD is ~6Jy at 6cm. No Tsys records available so a Tsys of 30K and consequently a DPFU of 5 K/Jy used. file names are contained in square brackets. |
AIPS Output Files
| Phase selfcal applied? | Yes |
| Global amplitude selfcal (gscal) applied? | No |
| Amplitude selfcal on non-global timescales used? | No |
| Modelfit made and saved? | Yes |
| Image Made and saved? | No |
| Comments on Difmap processing
On 0119+115, amplitudes on the NRAO140-Noto baseline are different in the two IF's IF1 flux ~0.7 Jy, IF2 flux ~0.43 Jy. Looking at J0149 data suggests Noto has very different responses in its two IFs. Applying a scale factor of 0.7/0.43 in AIPS with CLCOR brings fluxes on Noto-NRAO140 togther and fluxes on the Noto-AR baseline are similar but the AR-NRao140 fluxes differ by a factor of 0.23/0.295 = 1.28. |
| Modelfit | ||||
| Ampl, Phase vs (u,v) Distance PS (15 kb) JPEG (31 kb) |
Ampl, Phase vs Time PS (67 kb) JPEG 1, 2 |
(u,v) Coverage PS (11 kb) JPEG (25 kb) | Closure Phase vs Time PS (48 kb) JPEG 1 |
Image with model components PS (33 kb) JPEG (40 kb) |
More details on the Images and Modelfits are found in this page.
