VS06U Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Richard Dodson
Date Prepared: 22-04-2005
 

Summary
 
Observation code : VS06U    AIPS Version : 31DEC03   
Date of Observation : 1999/145    Difmap Version : 2.3c 
Source Name : J1257-3155    vsop_difmap used : Yes 
Calibration Source(s) : 1253-055         
Ground telescopes : Hh Sh Ho  Model Fitted to data : Yes 
Tracking Station(s) : (UZ) Rz    Image made : Yes 
Correlator : Mitaka         

 
Abstract
Fringes to VSOP_RZ, but not VSOP_UZ.

Original data set had 64 channels, and failed to match the PLS. The recorrelation with 128 channels produced the same answer. Therefore we could question whether the PLS or the data was correct.

Compare with vs06u by Horiuchi-san
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
0.299345 0.00873741 -55.1453 0.150058 1.00000 0.00000 0.6487
0.414328 0.807939 -96.9846 0.730265 1.00000 0.00000 0.0379
0.199558 0.706601 -159.870 0.754528 0.223152 13.2833 0.0767
(*) 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 
  
ACCOR solint 5
 
 
 
2 
  
CLCAL refant=1;
1 
1,2 
2,3 
 
 Amplitude calibration solutions applied. 
CLCOR opcode 'gain';antenna 0;clcorprm
   1.063,0
3 
 
3 
 
  
FRING docal -1; dparm 2,400,400,0.5,0;aparm(7)=0.1;solint
   5,10,15
 
 
 
3,4,5 
 Full range searched 
FRING dparm 2,0,400,0.5,0;aparm(7)=0.1;refa
   3/1;
timer 0 14 0 0 1 0/0 8 0
   0 0 9 0
 
 
 
6,7,8 
 Check for VSOP_UZ and Hart as reference 
SNEDT/CLCAL refant=1;interp
   'cube'/'ambg'/'self'
3 
4 
4,5,6 
9 
 4 for target, 6 for cal 
SPLIT aparm(1)=2 0;
4 
 
 
 
 Av within IF 
FITTP
 
 
 
 
 Data written out for analysis in Difmap 

AIPS Input Files
ANTAB.TXT Comments
used nominal_tsys.pl

AIPS Output Files
PRTAN.LIS
LISTR.LIS
DTSUM_0.LIS
DTSUM_1.LIS
VPLOT.PS
POSSM.PS
UVPLT_UV.PS
UVPLT_UVD.PS		 UVPLT_UVPA.PS
SN_ACCOR_AMP_1.PS
SN_ACCOR_AMP_2.PS
SN_APCAL_AMP_2.PS
SN_APCAL_AMP_1.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
IMAGE.FITS


Difmap Data Reduction Notes
Phase selfcal applied? Yes
Global amplitude selfcal (gscal) applied? No
Amplitude selfcal on non-global timescales used? Yes
Modelfit made and saved? Yes
Image Made and saved? Yes
Comments on Difmap processing
The LBA UNSO image shows a point source. The extended features have faded.

All components are part of the core, which is extended in the SW direction (opposite to the PLS direction).

Image and Model agree. However vs06u by Horiuchi-san and this do NOT agree. If I apply his very large corrections to all antennae I can reproduce his result (and the PLS), but I don't feel that is justifiable.

Image
Ampl, Phase vs (u,v) Distance
PS (43 kb)
JPEG (46 kb)
 Ampl, Phase vs Time
PS (162 kb)
JPEG 1, 2, 3		 (u,v) Coverage
PS (24 kb)
JPEG (30 kb)
Closure Phase vs Time
PS (105 kb)
JPEG 1		 Clean Image
PS (32 kb)
JPEG (47 kb)
Modelfit
Ampl, Phase vs (u,v) Distance
PS (43 kb)
JPEG (46 kb)
 Ampl, Phase vs Time
PS (162 kb)
JPEG 1, 2, 3		 (u,v) Coverage
PS (24 kb)
JPEG (30 kb)
Closure Phase vs Time
PS (105 kb)
JPEG 1		 Image with model components
PS (33 kb)
JPEG (38 kb)

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)
0.299345 0.00873741 -55.1453 0.150058 1.00000 0.00000 0.6487
0.414328 0.807939 -96.9846 0.730265 1.00000 0.00000 0.0379
0.199558 0.706601 -159.870 0.754528 0.223152 13.2833 0.0767
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Fri Apr 22 15:22:48 GMT 2005
by db_results.pl version 0.3.