VS03Q Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Richard Dodson
Date Prepared: 09-09-2004
 

Summary
 
Observation code : VS03Q    AIPS Version : 31DEC03   
Date of Observation : 2002/48    Difmap Version : 2.4a 
Source Name : J0339-01    vsop_difmap used : No 
Calibration Source(s) : J0423-01         
Ground telescopes : HO MP KA  Model Fitted to data : Yes 
Tracking Station(s) : UZ    Image made : Yes 
Correlator : Penticton         

 
Abstract
Double source. Hobart was unstable (but just about usable). Does not agree with VS03Q in 1998 (which is why it was repeated).
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
1.06032 0.164270 -129.393 0.291969 1.00000 0.00000 0.6070
0.681655 0.850868 52.3763 0.725406 1.00000 0.00000 0.0632
(*) 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. 
FRING docal -1; dparm 2,400,400,0.5,0;aparm(7)=0.1;solint
   5,10,15
 
 
 
2,3 
 Full range searched 
CLCAL inter 'ambg''cube''poly';intp
   2/4
2 
3 
3,4,5,6 
 
 Exploring the solutions. Hobart is poor. Mop refa 
FRING refa 3;dparm 2,30,30,0.5,0;dparm(7)=1;solint
   5;
5,6 
 
 
4,5 
 High rate of change of rate @ VSOP, so used CL #6 
SNSMO/CLCAL smoty 'dela';bparm(4)=0.5/interp
   'mwf';cparm(4)=1;cparm(9)=5
6 
5 
7 
6 
 smooth delays over 1/2 hour 
CLCOR opcode 'gain';ante 2;clcorprm
    0.9/0.7 0;timer 0 7 20 1
   0
7 
 
7 
 
 Kashima drops by 30% in the second 1/2 
SPLIT aparm(1)=2 0;
7 
 
 
 
 Av within IF 
FITTP
 
 
 
 
 Data written out for analysis in Difmap amplitude 

AIPS Input Files
ANTAB.TXT.gz
ANTAB.TXT		 Comments
used nominal_tsys.pl

AIPS Output Files
DTSUM_0.LIS
DTSUM_1.LIS
LISTR.LIS
PRTAN.LIS
SN_APCAL_AMP_1.PS
POSSM.PS
SN_APCAL_AMP_2.PS
SN_CALIB_DEL_1.PS
SN_CALIB_DEL_2.PS		 SN_CALIB_PHA_1.PS
SN_CALIB_PHA_2.PS
SN_CALIB_RAT_1.PS
SN_CALIB_RAT_2.PS
SN_CALIB_SNR_1.PS
SN_CALIB_SNR_2.PS
SN_FRING01_DEL_1.PS
SN_FRING01_DEL_2.PS
SN_FRING01_RAT_1.PS		 SN_FRING01_RAT_2.PS
SN_FRING01_SNR_1.PS
SN_FRING01_SNR_2.PS
UVPLT_UV.PS
UVPLT_UVD.PS
UVPLT_UVPA.PS
VPLOT.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
J0423-01 PLS model a good fit to the data. KA scan is before gain drop.

Hobart is very unstable. Kashima has a observable drop in gain at 7:17 UT going from 0.9Jy to 0.7. Corrected in AIPS.

The source is a double resolved core. This does not agree with 1998 VS03Q.

Image
Ampl, Phase vs (u,v) Distance
PS (49 kb)
JPEG (46 kb)
 Ampl, Phase vs Time
PS (139 kb)
JPEG 1, 2		 (u,v) Coverage
PS (25 kb)
JPEG (27 kb)
Closure Phase vs Time
PS (103 kb)
JPEG 1		 Clean Image
PS (31 kb)
JPEG (44 kb)
Modelfit
Ampl, Phase vs (u,v) Distance
PS (49 kb)
JPEG (46 kb)
 Ampl, Phase vs Time
PS (139 kb)
JPEG 1, 2		 (u,v) Coverage
PS (25 kb)
JPEG (27 kb)
Closure Phase vs Time
PS (103 kb)
JPEG 1		 Image with model components
PS (33 kb)
JPEG (39 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)
1.06032 0.164270 -129.393 0.291969 1.00000 0.00000 0.6070
0.681655 0.850868 52.3763 0.725406 1.00000 0.00000 0.0632
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Mon Sep 13 12:20:30 GMT 2004
by db_results.pl version 0.3.