| VS05x Results
Submitted checklist.txt and checklist.tex is also available |
[Summary | AIPS | Difmap ] |
| Observation code | : | VS05x | AIPS Version | : | 31DEC00 |
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| Date of Observation | : | 1998/214 | Difmap Version | : | 2.4a | |||
| Source Name | : | J0125-0005 | vsop_difmap used | : | Yes | |||
| Calibration Source(s) | : | 0552+398 | ||||||
| Ground telescopes | : | GB, HH | Model Fitted to data | : | Yes | |||
| Tracking Station(s) | : | RZ | Image made | : | No | |||
| Correlator | : | Penticton |
| Abstract
Experiment correlated on 21-Sep-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 Strong fringes seen on the only ground baseline from NRAO_140 to HART but no fringes to space even though projected space baselines were shorter than the ground baseline at times and the correlated flus was almost 300 mJy on the ground. As a result, a point source model fit was all that was attempted. |
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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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Nominal HALCA Tsys. Flat gain curve for NRAO 140ft and DPFU from GAM. |
| APCAL |
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TY = GC = 1 | |
| CLCAL | refant=1, interpol=self |
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NARAO 140ft is ref ant. Used Self for interpolation as 2nd-last and last 140ft gains are very different and are for different sources. A 2pt interpolation would have given a big gradient in gain. |
| FRING | docalib 1 gainuse 2 refant 1 solint 5 dparm 0,10000,400,1,1,0 timerang 0,7,0,0,0,8,20,0 |
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No fringes to space |
| FRING | docalib 1 gainuse 2 refant 1 solint 10 dparm 0,10000,400,1,1,0 timerang 0,7,0,0,0,8,20,0 |
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No fringes to space |
| FRING | docalib 1 gainuse 2 refant 1 solint 5 dparm 0,20000,1000,1,1,0 timerang 0,7,0,0,0,8,20,0 |
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No fringes to space |
| FRING | docalib 1 gainuse 2 refant 1 solint 5 dparm 0,10000,40,1,0 timerang 0 |
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LS solution |
| TACOP |
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copy CL table before CLCOR | |
| CLCOR | antennas 2,0 opcode 'sbdl' clcorprm -4770,-4770,0 |
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take out big delay on ground baseline |
| CLCOR | antennas 0 opcode 'gain' clcorprm 1.0774,0 |
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apply amplitude correction factor |
| FRING | docalib 1 gainuse 3 refant 1 solint 5 dparm 0,100,50,1,0 timerang 0 search 2,0 |
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Final LS solution |
| SNEDT |
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| CLCAL | interpol 'ambg' refant 1 |
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| SPLIT | aparm = 2,0 ichansel 20,256,1,0 |
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phase is non-zero in first 20 chans |
| FITTP |
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AIPS Input Files
| ANTAB.TXT INDXR.TXT |
Comments NRAO 140 gain from George Moellenbrock (an estimate, probably good to 10%) |
AIPS Output Files
| Phase selfcal applied? | No |
| 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
For the calibration source 0552+398: vs_load 0552+398_LOVELL_AIPS.FITS radpl reveals only one data point!! For the program source vs_load J0125-00_LOVELL_AIPS.FITS radpl uvpl vplot (flagged bad data - includes all space-baselines) addcmp 0.25,true,0,0,false modelfit 10 (i.e) fitted a point source. vs_final_mod |
| Modelfit | ||||
| Ampl, Phase vs (u,v) Distance PS (17 kb) JPEG (36 kb) |
Ampl, Phase vs Time PS (70 kb) JPEG 1, 2 |
(u,v) Coverage PS (10 kb) JPEG (23 kb) | Closure Phase vs Time PS (46 kb) JPEG 1 |
Image with model components PS (62 kb) JPEG (49 kb) |
More details on the Images and Modelfits are found in this page.
