VS05C1 Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Richard Dodson
Date Prepared: 5-3-2002
 

Summary
 
Observation code : VS05C1    AIPS Version : 31DEC03   
Date of Observation : 2002/302    Difmap Version : 2.4a 
Source Name : J0739+01    vsop_difmap used : No 
Calibration Source(s) : J0811+01         
Ground telescopes : MP HO KA SH  Model Fitted to data : Yes 
Tracking Station(s) : UZ    Image made : Yes 
Correlator : Penticton         

 
Abstract
Phase solutions are pretty crap. But the signal is strong, so a startmod on a 1 minute timescale is required.
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
0.279741 0.128917 84.8972 0.00000 1.00000 0.00000 0.0000
0.532596 0.0547025 -93.3622 0.00000 1.00000 0.00000 0.0000
0.813690 0.363050 -88.3227 15.9096 0.00000 -75.5173 0.0000
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


AIPS Data Reduction Notes
 
Task
Adverbs
CL
in
SN
in
CL
out
SN
out
Comments
FITLD clint = 0.25
digicor = -1
delcorr = -1
 
 
 
 
  
INDXR cparm = 0, 0, 0.25;
 
 
1 
 
  
ANTAB infile='antab.txt'
 
 
 
 
  
APCAL
 
 
 
1 
  
CLCAL refant=1;
1 
1 
2 
 
 Amplitude calibration solutions applied. Mop as ref 
FRING docal -1; dparm 2,200,200,0.5,0;aparm(7)=0.1;solint
   5,10,15
 
 
 
2,3,4 
 Full range searched. Halca fringes weaken at 23:15 
FRING docal -1; dparm 2,200,200,0.5,0;solint
   10;anten 1 2 3 4 0
 
 
 
5 
 GRTs only - some jumps. 
FRING docal -1; dparm 2,100,20,2,0;solint
   5;aparm 2 0;
 
 
 
6 
 GRTs only - narrow; flagval -1 again! 
CLCAL refant=1;interp 'ambg';opco
   'calp'
2 
6 
3 
 
  
FRING dparm 2,300,0,0.5,0;aparm(7-9)=0.1
   0 1;solint 5,10
3 
 
 
7,8 
 rate is very high right at the end 
SNEDT
 
8 
 
9 
  
CLCAL refant=1;interp 'poly';intp
   7;
3 
9 
4 
 
  
CALIB refant=1;solint 5;solm
   'p';aparm(1)=3;
4 
 
 
10 
  
CLCAL refant=1;interp '';
4 
10 
5 
 
  
FRING dparm 2,400,400,0.5,0;refant
   3/2;solint 10;
 
 
 
11,12 
 Return like a dog to vomit. Not happy with the solutions. 
SNEDT
 
12 
 
13 
  
CLCAL refant=2;interp 'poly';intp
   10
2 
13 
6 
 
  
FRING dparm 2,40,40,0.5,0;refant
   2;solint 10;
 
 
 
14 
 Try a narrow one post poly 
SNSMO bparm 0,0,4/6,4/6;cparm
   0,0,0.5,0.5,0,0,0,10,10
 
14 
 
15 
  
CLCAL refant=2;interp 'ambg'/'cube'
6 
15 
7 
 
 Neither give a good result for the last hour of VSOP. 
CLCOR ante 5 0;timer 0 23 5 0 1
    0;opc 'cloc';clcorprm
   4.5/45/60/5*86400
8 
 
8 
 
 IF 1 4.5 turns (in positive phase) in 45 minutes at 5GHz. IF 2 negative same. (a bit later). Odd. 
CALIB aparm(1)=3 0;
8 
 
 
16 
  
CLCAL refant=2;interp ''
8 
16 
9 
 
  
SPLIT aparm(1)=2 0;
9 
 
 
 
 Av within IF 
FITTP
 
 
 
 
 Data written out for analysis in Difmap 

AIPS Input Files
ANTAB.TXT Comments
used nominal_tsys.pl

Additional Files
NameDescription
SUR5C1.0JPSurvey run file

AIPS Output Files
PRTAN.LIS
LISTR.LIS
DTSUM_0.LIS
DTSUM_1.LIS
UVPLT_UV.PS
UVPLT_UVD.PS
UVPLT_UVPA.PS
SN_APCAL_AMP_2.PS
VPLOT.PS		 SN_APCAL_AMP_1.PS
SN_FRING1_DEL_1.PS
SN_FRING1_DEL_2.PS
SN_FRING1_RAT_1.PS
SN_FRING1_RAT_2.PS
SN_FRING1_SNR_1.PS
SN_FRING1_SNR_2.PS
SN_CALIB_DEL_1.PS
SN_CALIB_DEL_2.PS		 SN_CALIB_RAT_1.PS
SN_CALIB_RAT_2.PS
SN_CALIB_SNR_1.PS
SN_CALIB_SNR_2.PS
SN_CALIB_PHA_1.PS
SN_CALIB_PHA_2.PS
POSSM.PS


Difmap Data Reduction Notes
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
1 minutes selfcal.

Tingay model fits well, with a increase in flux of 1.0/0.7. This value matches the values from UMRAO (tho the time range does not overlap). Also I reckon the he did not correct for Penticton scale errors. The Hobart/Mop baseline is high, the short baseline structure is complex. I have put in a narrow (non-physical) elliptical gaussian

The pre-launch fits pretty well, but underestimates the VSOP baselines. The jet axis is correct.

J0811+01 flux is 0.5Jy, which is reasonable from UMRAO data.

Image
Ampl, Phase vs (u,v) Distance
PS (52 kb)
JPEG (44 kb)
 Ampl, Phase vs Time
PS (241 kb)
JPEG 1, 2, 3		 (u,v) Coverage
PS (46 kb)
JPEG (29 kb)
Closure Phase vs Time
PS (305 kb)
JPEG 1, 2		 Clean Image
PS (825 bytes)
Modelfit
Ampl, Phase vs (u,v) Distance
PS (52 kb)
JPEG (44 kb)
 Ampl, Phase vs Time
PS (241 kb)
JPEG 1, 2, 3		 (u,v) Coverage
PS (46 kb)
JPEG (29 kb)
Closure Phase vs Time
PS (305 kb)
JPEG 1, 2		 Image with model components
PS (825 bytes)

More details on the Images and Modelfits are found in this page.

Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
0.279741 0.128917 84.8972 0.00000 1.00000 0.00000 0.0000
0.532596 0.0547025 -93.3622 0.00000 1.00000 0.00000 0.0000
0.813690 0.363050 -88.3227 15.9096 0.00000 -75.5173 0.0000
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Fri Aug 6 04:59:18 GMT 2004
by db_results.pl version 0.3.