VS02H Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Richard Dodson
Date Prepared: 29-06-2004
 

Summary
 
Observation code : VS02H    AIPS Version : 31DEC03   
Date of Observation : 2000/143    Difmap Version : 2.3c 
Source Name : J1625-2527    vsop_difmap used : No 
Calibration Source(s) :          
Ground telescopes : SH CD MP  Model Fitted to data : Yes 
Tracking Station(s) : UZ RZ    Image made : Yes 
Correlator : Penticton         

 
Abstract
resolved single source matches that of the pre-launch, with the variability extrapolated from AT light curves.

Did selfcal in AIPS, combining IFs. J1625-25_VS02H_AIPS.UVF One component is enough.
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
1.00646 0.162388 81.1895 0.685121 0.734471 -28.7550 0.1425
(*) 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. Ceduna as ref 
CLCOR opcode 'gain';antenna 0;clcorprm
   1.19,0;
opco 'sbdl';clcorp -3400,-3400,0;
   ante 1 2 0
3 
 
3 
 
  
FRING docal -1; dparm 2,0,0,0.5,0;aparm(7)=0.1;solint
   5,10
 
2,3 
 
 
  
FRING docal 1;flagv -1; dparm
   2,0,0,0.5,0;aparm(7)=0.1;
refan 1,2
 
4,5,6 
 
 
 High residual delays in DQA1. Removed. As these are the short baselines it could be position? 
FRING docal -1,1;cals '1548+056'';solint
   3;dparm 2,0,0,0.5,0
 
7,8 
 
 
 Both sources have same offset, therefore it is antenna based. 
CLCAL refant=2;cals
   '-1548+056','1548+056'
3 
 
4,5 
8,6 
  
SPLIT aparm(1)=2 0;
4/5 
 
 
 
 for each source. 
FITTP
 
 
 
 
 Data written out for analysis in Difmap 

AIPS Input Files
ANTAB.TXT Comments
Used nominal_tsys.pl

AIPS Output Files
DTSUM_0.LIS
DTSUM_1.LIS
LISTR.LIS
UVPLT_UV.PS
UVPLT_UVD.PS
UVPLT_UVPA.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
POSSM01_AP.PS
IMAGE.FITS


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
Prelanuch flux (3.4Jy Gaussian) is consistant with the extrapolated light curve. The modelfit requires too many features to realistically believe the calculated brightness temperature. The cleaned image looks similar to the modelfit.

One component is enough. No sign of a point-like core.

Image
Ampl, Phase vs (u,v) Distance
PS (64 kb)
JPEG (49 kb)
 Ampl, Phase vs Time
PS (158 kb)
JPEG 1, 2		 (u,v) Coverage
PS (32 kb)
JPEG (27 kb)
Closure Phase vs Time
PS (110 kb)
JPEG 1		 Clean Image
PS (31 kb)
JPEG (54 kb)
Modelfit
Ampl, Phase vs (u,v) Distance
PS (64 kb)
JPEG (48 kb)
 Ampl, Phase vs Time
PS (157 kb)
JPEG 1, 2		 (u,v) Coverage
PS (32 kb)
JPEG (27 kb)
Closure Phase vs Time
PS (109 kb)
JPEG 1		 Image with model components
PS (31 kb)
JPEG (37 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)
1.00646 0.162388 81.1895 0.685121 0.734471 -28.7550 0.1425
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Tue Oct 11 06:23:20 UTC 2005
by db_results.pl version 0.3.