| VS04d Results
Submitted checklist.txt and checklist.tex is also available |
[Summary | AIPS | Difmap ] |
| Observation code | : | VS04d | AIPS Version | : | 15Apr99 |
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| Date of Observation | : | 1997/362 | Difmap Version | : | 2.3c | |||
| Source Name | : | 1144-379 | vsop_difmap used | : | Yes | |||
| Calibration Source(s) | : | |||||||
| Ground telescopes | : | Mp, Ho, Mk | Model Fitted to data | : | Yes | |||
| Tracking Station(s) | : | GZ | Image made | : | Yes | |||
| Correlator | : | Penticton |
| Abstract
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| FITLD | DIGICOR=DELCOR=-1 |
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Output file name = VS04d.FITLD |
| MSORT |
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Input file name = VS04d.FITLD, Output file name = VS04d.UVSRT | |
| INDXR |
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Created NX(1) There were no CSEs. | |
| ANTAB |
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Used Tsys values of 92,96K for Halca. For the Mp, used nominal values (Tsys=34K, DPFU=0.1). Output sent to TY(1) and GC(1). | |
| APCAL |
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Input: Ty(1) + GC(1) | |
| CLCAL | OPCODE = CALP INTERPOL = 'AMBG' REFANT 7 (Mp) |
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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 all other antennas to 0. | |
| TBIN |
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Read in DQA1 delay and rate solutions. | |
| SNEDT |
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Editted a few discrepant DQA1 solutions. | |
| CLCAL | OPCODE = CALP INTERPOL = 'AMBG' REFANT 7 (Mp) |
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| FRING | DOCALIB 1 GAINUSE 3 REFANT 7 (Mp) SEARCH 4,5 SOLINT 3 TIMER 0 19 0 0 0 19 30 0 APARM(1)=2 APARM(7)=2 (SNR=2) APARM(9)=1 DPARM(1)=3 (include baseline stacking) DPARM(2)=50 (50ns delay window!) DPARM(3)=20 (20mHz rate window) DPARM(4)=0.5 (0.5 sec integration time) DPARM(6)=1 (don't average in frequency) BCHAN 0, ECHAN 0 |
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Got good solutions, although rate window may be a little small...Try the entire time range with a larger rate window. Also, got plenty of SNR, so reduce solint, and up the SNR to a reasonable value. |
| FRING | As above but with: SOLINT 2 DPARM(3)=40 (40mHz rate window) TIMER 0 APARM(7) 5 |
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Got good solutions. |
| SNEDT |
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Minor editting. | |
| CLCAL | OPCODE='CALP' INTERPOL = 'AMBG' SMOTYPE = '' REFANT 1 |
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| CLCOR |
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Did not use. Mp baselines were slightly higher than Ho baselines, but I'll let gscale take care of that. Overall, all the amplitudes seem lowish (zero spacing flux about 1.6Jy, while AT light curves indicate about 2.6Jy). However, the source is highly variable over short (one month) timescales, so I can't justify altering the overall amplitude scale. | |
| SPLIT | SOURCES '1144-379' BCHAN 0, ECHAN 0 DOCALIB 1, GAINUSE 4 APARM(1)=2 (average each IF separately) APARM(2)=0.5 APARM(4)=1 |
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Input file: VS04d.UVSRT, Output file: 1144-379.FITS |
| FITTP |
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Input file: 1144-379.FITS, Output file: 1144-379.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
Used the default 1 Jy source as a starting model. Needed to use uvtaper 0.5,100 to pick up the short spacing flux on later clean/phase-self-cal iterations. Tried running gscale, but it ended up flagging out most of the data, and gave a rather largish (1.15,1,2) correction to Halca. Ended up not using the gscale corrections. Final image: Had a 0.935 Jy/beam core, with evidence for jet component to the north and south. |
| Image | ||||
| Ampl, Phase vs (u,v) Distance PS (42 kb) GIF (7 kb) |
Ampl, Phase vs Time PS (138 kb) GIF 1, 2 |
(u,v) Coverage PS (23 kb) GIF (5 kb) | Closure Phase vs Time PS (104 kb) GIF 1 |
Clean Image PS (41 kb) GIF (40 kb) |
| Modelfit | ||||
| Ampl, Phase vs (u,v) Distance PS (42 kb) GIF (7 kb) |
Ampl, Phase vs Time PS (138 kb) GIF 1, 2 |
(u,v) Coverage PS (23 kb) GIF (5 kb) | Closure Phase vs Time PS (104 kb) GIF 1 |
Image with model components PS (42 kb) GIF (7 kb) |
More details on the Images and Modelfits are found in this page.
