| VS08c Results
Submitted checklist.txt and checklist.tex is also available |
[Summary | AIPS | Difmap ] |
| Observation code | : | VS08c | AIPS Version | : | 31DEC00 |
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| Date of Observation | : | 2001/198 | Difmap Version | : | 2.3c | |||
| Source Name | : | J0132-16 | vsop_difmap used | : | Yes | |||
| Calibration Source(s) | : | J0204+15, J0106-40 | ||||||
| Ground telescopes | : | Mp, Ho, Se, Hh, Cd | Model Fitted to data | : | Yes | |||
| Tracking Station(s) | : | UZ | Image made | : | Yes | |||
| Correlator | : | Penticton |
| Abstract
PLS radplot of source (J0132-16) showed flux decreasing to approximately 0.5Jy at 140Mlambda. No AT light curves. Uncorrected (using only ANTAB values) amplitudes had a flux at 150Mlambda of about 250mJy (Hh-Aus baseline). Low spacing flux was about 0.5Jy. Both of these flux values are about half of the PLS flux. Flux for calibrators was about 60% of the PLS flux for J0204+15, and about 85% of the PLS flux for J0106-40. No fringes were found to Ho or Halca. Hard to say whether any any space fringes should have been detected or not. However, this experiment was one of three observed around the same time (VS06h, VS07s, VS08c), with only one tracking station (Uz), and all with failed space fringes. I suspect whatever caused the lack of space fringes was not source intrinsic but instead was due to a tracking station problem (???). |
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| FITLD | DIGICOR=DELCOR=-1 |
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Output file name = VS08C.FITLD |
| MSORT |
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Input file name = VS08C.FITLD, Output file name = VS08C.UVSRT | |
| FIXWT |
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Not done. | |
| INDXR | CPARM(1)=3 CPARM(2)=60 CPARM(3)=0.25 |
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Created NX(1) |
| ANTAB |
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Used a nominal DPFU for Ho, Mp, and Halca. For Halca used a Tsys of 88K, 92K. For Mp used a nominal Tsys of 34K. For Se used a nominal Tsys of 88.8K. For all other GRTs (Cd, Hh, Ho) had non-nominal Tsys values. | |
| APCAL |
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Input: Ty(1) + GC(1) | |
| CLCAL | OPCODE = CALP INTERPOL = 'AMBG' REFANT 1 (Cd) |
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| TBOUT | INEXT = 'AN' |
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| TBIN |
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Changed MNTSTA entries in the AN table. Changed Halca from 3 to 2, and changed Hh and Ho to 0. | |
| TBIN |
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Read in DQA1 delay and rate solutions. | |
| TAFLG | OPTYPE '= ' APARM 4,0 (column 4 = antenna column) BPARM 1,3 (Ho = antenna 3) CPARM 0 |
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Flagged out Ho solutions as they were all over the place in the DQA1 report (although the DQA1 report classified them as good!). |
| TAFLG | OPTYPE '= ' APARM 4,0 (column 4 = antenna column) BPARM 1,6 (Halca = antenna 6) CPARM 0 |
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Flagged out Halca solutions as they were all over the place in the DQA1 report (although the DQA1 report classified them as good!). |
| CLCAL | OPCODE = CALP INTERPOL = 'AMBG' REFANT 1 (Cd) |
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| UVFLG | OPCODE = REAS REASON 'NO PRC/LOW DVAL' |
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Needed to unflag the NO PRC/LOW DVAL data... as per the piletter most of this data was ok. |
| FRING | DOCALIB 1 GAINUSE 3 TIMER 0 ANTENNAS 0 SOLINT 10 REFANT 1 APARM(1)=2 APARM(7)=3 (SNR=3) DPARM(1)=3 (include baseline stacking) DPARM(2)=2000 (2000 ns delay window) DPARM(3)=100 (100mHz rate window) DPARM(4)=0.5 DPARM(5)=0 DPARM(6)=1 |
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Look for Halca solutions with a large window and long solint. None found. |
| FRING | DOCALIB 1 GAINUSE 3 TIMER 0 ANTENNAS 0 SOLINT 10 REFANT 1 APARM(1)=2 APARM(7)=3 (SNR=3) DPARM(1)=3 (include baseline stacking) DPARM(2)=2000 (2000 ns delay window) DPARM(3)=100 (100mHz rate window) DPARM(4)=0.5 DPARM(5)=0 DPARM(6)=1 |
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Look for Halca solutions with a large window and short solint. None found. Tried a bunch of other stuff as well, but nothing worked. |
| SNEDT |
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Minor editting. | |
| CLCAL | OPCODE='CALP' INTERPOL = 'AMBG' SMOTYPE = '' REFANT 8 |
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| SPLIT | SOURCES 'J1147-07' DOCALIB 1, GAINUSE 4 |
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Input file: VS08C.UVSRT, Output file: J1147-07.FITS, 1253-055.FITS |
| FITTP |
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Input file: J1147-07.FITS, 1253-055.FITS Output file: J1147-07.FITS, 1253-055.FITS amplitude |
AIPS Input Files
| ANTAB.TXT INDXR.TXT |
Comments - None - |
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? | Yes |
| Comments on Difmap processing
Flagged out Hobart and Hart, as they had no fringes (makes sense, since did not get FRING solutions for these antennas. Very difficult to get a good clean component model, so used an elliptical Gaussian for the core, and model-fit the extended emission with clean components. Tried and amp self-cal for fun, but it gave corrections to Hart of about 1.9, which I did not believe, and so disregarded. |
| Image | ||||
| Ampl, Phase vs (u,v) Distance PS (36 kb) JPEG (36 kb) |
Ampl, Phase vs Time PS (228 kb) JPEG 1, 2, 3 |
(u,v) Coverage PS (19 kb) JPEG (25 kb) | Closure Phase vs Time PS (314 kb) JPEG 1, 2 |
Clean Image PS (34 kb) JPEG (45 kb) |
| Modelfit | ||||
| Ampl, Phase vs (u,v) Distance PS (36 kb) JPEG (36 kb) |
Ampl, Phase vs Time PS (227 kb) JPEG 1, 2, 3 |
(u,v) Coverage PS (19 kb) JPEG (25 kb) | Closure Phase vs Time PS (314 kb) JPEG 1, 2 |
Image with model components PS (46 kb) JPEG (41 kb) |
More details on the Images and Modelfits are found in this page.
