| VS04U Results
Submitted checklist.txt and checklist.tex is also available |
[Summary | AIPS | Difmap ] |
| Observation code | : | VS04U | AIPS Version | : | 31DEC03 |
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| Date of Observation | : | 1999/202 | Difmap Version | : | 2.3c | |||
| Source Name | : | J0743-67 | vsop_difmap used | : | Yes | |||
| Calibration Source(s) | : | 0637-752 | ||||||
| Ground telescopes | : | HH HO MP | Model Fitted to data | : | Yes | |||
| Tracking Station(s) | : | UZ | Image made | : | Yes | |||
| Correlator | : | Penticton |
| Abstract
No space fringes. Very complicated source has to be fitted, although the model for VS04U1 (and RRF) is much simpler. This may mean the data is corrupted, but this seems unlikely (the ripples are uv based (see projplot.ps) rather than antenna based. 29 free parameters were used in the fit, whilst there are only ~ 16 uv space bins. It is difficult to know what to do about this. The models for RRF (@8GHz) and VS04U1 are much simpler. The latter (which is really a failed experiment) can fit the VS04U model. EBF and ZP: 10-OCT-2005 Used data for 1999 in VS04U_1999_AIPS.UVF Date in 2003, VS04U_2003_AIPS.UVF, is much noisier Fit data with two major components: a core with size 0.75 mas +/- 0.20 and an elongated component about 28 mas to the east. There is some sign of faint emission to the west. |
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| FITLD | clint = 0.25 digicor = -1 delcorr = -1 |
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| INDXR | cparm = 0, 0, 0.25; |
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| ANTAB | infile='antab.txt' |
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| APCAL |
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| CLCAL | refant=1; |
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Amplitude calibration solutions applied. |
| CLCOR | opcode 'gain';antenna 0;clcorprm 1.19,0 |
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| FRING | docal -1; dparm 2,400,400,0.5,0;aparm(7)=0.1;solint 5,10,15 |
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Full range searched |
| TACOP/SNCOR/CLCAL | refant=1;ante 3;opc 'zphs'/'zrat'/'zdel';interp 'cube'/'ambg' |
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copy & zero VSOP |
| CALIB/CLCAL | ante -4;opc 'calp';interpo 'simp' |
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| KRING | dofit 4 0;cparm 1/2,0,0,-1,0;aparm(7)=0.1;solint 5;solm 'rd'/'' |
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No VSOP fringes |
| SPLIT | aparm(1)=2 0; |
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Av within IF |
| FITTP |
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Data written out for analysis in Difmap amplitude |
AIPS Input Files
| ANTAB.TXT | Comments used nominal_tsys.pl |
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
Very very complicated structure fitted. Can find no reason to fault it. Two clusters of emission 20 mas apart. RRF 8GHz has two (point?) sources but much closer together (2002 data cf 1999). EBF and ZP: 10-OCT-2005 Fit data with two major components: a core with size 0.75 mas +/- 0.20 and an elongated component about 28 mas to the east. There is some sign of faint emission to the west. Faint point source in RRF 8 GHz to south west of core is faint and might not be detected by VSOP. Lack of space fringes may be consistent with structure? |
| Image | ||||
| Ampl, Phase vs (u,v) Distance PS (33 kb) JPEG (35 kb) |
Ampl, Phase vs Time PS (94 kb) JPEG 1, 2 |
(u,v) Coverage PS (18 kb) JPEG (27 kb) | Closure Phase vs Time PS (54 kb) JPEG 1 |
Clean Image PS (93 kb) JPEG (55 kb) |
| Modelfit | ||||
| Ampl, Phase vs (u,v) Distance PS (33 kb) JPEG (35 kb) |
Ampl, Phase vs Time PS (94 kb) JPEG 1, 2 |
(u,v) Coverage PS (18 kb) JPEG (27 kb) | Closure Phase vs Time PS (54 kb) JPEG 1 |
Image with model components PS (87 kb) JPEG (47 kb) |
More details on the Images and Modelfits are found in this page.
