| VS04z Results
Submitted checklist.txt and checklist.tex is also available |
[Summary | AIPS | Difmap ] |
| Observation code | : | VS04z | AIPS Version | : | 15Apr99 |
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| Date of Observation | : | 2000/209 | Difmap Version | : | 2.3c | |||
| Source Name | : | J1504+10 | vsop_difmap used | : | Yes | |||
| Calibration Source(s) | : | 1611+343 | ||||||
| Ground telescopes | : | Mp, Ho, Sh, Kl, Hh | Model Fitted to data | : | Yes | |||
| Tracking Station(s) | : | TZ, RZ, NZ | Image made | : | Yes | |||
| Correlator | : | Penticton |
| Abstract
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| FITLD | DIGICOR=DELCOR=-1 |
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Output file name = VS04Z.FITLD |
| MSORT |
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Input file name = VS04Z.FITLD, Output file name = VS04Z.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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For Halca used a Tsys of 88K, 92K. Could not find Tsys values for SH on the EVN FTP site, so used nominal values. For KL, used a nominal number for the gain. There were no Tsys values for MP on either the ATNF or JPL web site, so used nominal values for gain and Tsys for MP as well. For Hh had both (non-nominal) gain and Tsys values. For HO, had Tsys values (actually numbers were SEFDs according to R. Dodson), so used these in conjunction with a DPFU of 1. | |
| APCAL |
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Input: Ty(1) + GC(1) | |
| SNEDT |
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Extremely minor editting. | |
| CLCAL | OPCODE = CALP INTERPOL = '2PT' REFANT 1 (Hh) |
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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 using antenna 6 (Se) as the reference antenna. antenna. Will also later read in DQA1 solutions using antenna 1 (Hh) as the refant. Hh comes on line at about 0:11:44 until the end of the observation. Have to use two refants since there is no antenna which observes for the entire timerange. | |
| TAFLG | OPTYPE '>= ' APARM 1,0 BPARM 1,0.4889 CPARM 0 |
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Remove solutions with times greater than about 0:11:44. After this time Hh will be used as a reference antenna, so do not want to apply the delay offsets to Se after this time. I had lots of problems getting CLCAL to produce correct delays when there was a time interval where there were two sets of DQA1 solutions. |
| TBIN |
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Read in DQA1 delay and rate solutions using antenna 1 (Hh) as the reference antenna. | |
| SNEDT |
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Did not bother to edit DQA1 solutions. | |
| CLCAL | OPCODE = CALP INTERPOL = 'AMBG' REFANT 6 (Se) |
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| CLCAL | OPCODE = CALP INTERPOL = 'AMBG' REFANT 1 (Hh) |
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Note, cannot use CL(3) as the input CL, since the last solution from SN(4) was interpolated over the entire timerange. |
| FRING | DOCALIB 1 GAINUSE 3 TIMER 0 0 0 0 0 11 44 52 SOLINT 5 REFANT 6 (Se) SEARCH 0 APARM(1)=2 APARM(7)=3 (SNR=3) DPARM(1)=3 (include baseline stacking) DPARM(2)=20 (20 ns delay window) DPARM(3)=10 (10mHz rate window) DPARM(4)=0.5 DPARM(5)=0 DPARM(6)=1 |
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Solutions looked great. |
| FRING | DOCALIB 1 GAINUSE 4 TIMER 0 11 44 52 0 23 0 0 SOLINT 5 REFANT 1 (Hh) SEARCH 0 APARM(1)=2 APARM(7)=3 (SNR=3) DPARM(1)=3 (include baseline stacking) DPARM(2)=20 (20 ns delay window) DPARM(3)=10 (10mHz rate window) DPARM(4)=0.5 DPARM(5)=0 DPARM(6)=1 |
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Solutions looked great. |
| SNEDT |
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Minor editting. | |
| SNEDT |
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Minor editting. | |
| CLCAL | OPCODE='CALP' INTERPOL = 'AMBG' SMOTYPE = '' REFANT 6 Timer 0 0 0 0 0 11 44 52 |
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| CLCAL | OPCODE='CALP' INTERPOL = 'AMBG' SMOTYPE = '' REFANT 1 Timer 0 11 44 52 0 23 0 0 |
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| TABED | OPTYPE 'COPY' APARM 0 KEYWORD '' KEYVALUE 0 |
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Will combine CL(5) and CL(6) into CL(7). |
| TABED | OPTYPE 'COPY' APARM 0 KEYWORD '' KEYVALUE 0 |
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Combined CL(5) and CL(6) into CL(7). |
| TACOP |
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| CLCOR | OPCODE 'GAIN' ANTENNAS 2,0 CLCORPRM 3,0 |
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After the first round of AIPSing, and looking at the crossing points (Hh-Mp + Hh-Ho) and (Ho-Kl + Mp-Kl), it seems Ho is down by about a factor of 3. Apply this factor. Note, this if very suspicious, since it roughly corresponds to a DPFU of 0.1 for Ho. Formerly set the DPFU to 1 as I was informed the Ho values in the Tsys file were SEFDs. Not really enough info to make a global amplitude change to all GRTs using the target/calibrator sources. |
| SPLIT | SOURCES 'J1504+10' DOCALIB 1, GAINUSE 8 |
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Input file: VS04Z.UVSRT, Output file: J1504+10.FITS |
| FITTP |
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Input file: J1504+10.FITS, Output file: J1504+10.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
Had lots of problems. Shortest spacings (Mp-Ho) seemed very high compared to the rest of the visibilities. Howvever, couldn't rule out a-priori that this was legitimate. Gscale attempts were all over the map, depending on the model I used so decided to forgo gscale. Had to apply a large taper on later iterations of clean/phase-self-cal in order to pick up the high short spacing flux. Final image looked a little ratty, but this may be due to the fact that no amp-self cal was applied. |
| Image | ||||
| Ampl, Phase vs (u,v) Distance PS (118 kb) JPEG (47 kb) |
Ampl, Phase vs Time PS (326 kb) JPEG 1, 2, 3 |
(u,v) Coverage PS (59 kb) JPEG (30 kb) | Closure Phase vs Time PS (303 kb) JPEG 1, 2 |
Clean Image PS (52 kb) JPEG (48 kb) |
| Modelfit | ||||
| Ampl, Phase vs (u,v) Distance PS (118 kb) JPEG (48 kb) |
Ampl, Phase vs Time PS (327 kb) JPEG 1, 2, 3 |
(u,v) Coverage PS (59 kb) JPEG (30 kb) | Closure Phase vs Time PS (303 kb) JPEG 1, 2 |
Image with model components PS (52 kb) JPEG (46 kb) |
More details on the Images and Modelfits are found in this page.
